TM 55-2995-223-40DEPARTMENT OF THE ARMY TECHNICAL MANUAL

GS MAINTENANCE MANUAL

E L E C T R O M E C H A N I C A L L I N E A R A C T U A T O RPART NUMBER SYLC 9190 -10

( B a r b e r - C o l m a n )

Headquarters, Department of the Army, Washington, D. C.30 January 1969

WARNINGPRECAUTIONARY DATA

Personnel performing instructions involving operations, proceduresand practices which are included or implied in this technical manualshall observe the following instructions. Disregard of these warningsand precautionary information can cause serious injury, death, or anaborted mission.

TABLE OF CONTENTS

Section Page

I INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.

2.

3.

4.

5.

6.

7.

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... ..3

Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3

Equipment Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3

Painting Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3

Preservation and Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

Description . . . . . . . . . . . . . . . . . . . . . . . .5

LeadingParticulars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

PageII TEST EQUIPMENT, SPECIAL TOOLS AND MATERIALS . . . . 6

8. Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...6

9. Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

III GENERAL SUPPORT MAINTENANCE . . . . . . . . . . . . . . . . . . ...7

10. Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . .7-9

11. Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

12. Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

13. Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

14. Repair orReplacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

15. Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11

16. Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-15

I V FINAL TEST PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

17. Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16-19

V DIFFERENCE DATA SHEETS... . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Appendix

A REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

CHANGE

No. 2

TM 55-2995-223-40C 2

HEADQUARTERSDEPARTMENT OF THE ARMY

WASHINGTON, D.C., 6 November 1974

GS Maintenance Manual

ELECTROMECHANICAL LINEAR ACTUATORPART NUMBER SYLC 9190-10

TM 55-2995-223-40, 30 January 1969, is changed as follows:

Page 16. Figure 5 is superseded.

(BARBER-COLMAN)

Figure 5. Wiring Diagram

By Order of the Secretary of the Army:

FRED C. WEYANDOfficial: General, United States Army

VERNE L. BOWERS Cbief of StaffMajor General, United States ArmyThe Adjutant General

DISTRIBUTION:To be disributed in accordance with DA Form 12-31 (qty rqr block nos. 337, 344,

35, 354, and 39, cumulative for all blocks) Direct and General Support MaintenanceRequirements for UH-1A, UH-1B, UH-1C, UH-1D, and 1H, and AH-1G aircraft.

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TM 55-2995-223-40C 1

CHANGE

No. 1

HEADQUARTERSDEPARTMENT OF THE ARMY

WASHINGTON, D, C,, 15 October 1969

GS Maintenance ManualIncluding Repair Parts and Special Tools Lists

ELECTROMECHANICAL LINEAR ACTUATOR

PART NUMBER SYLC 9190-10

(Barber-Colman)

TM 55-2995-223-40, 30 January 1969, is changed as follows:

Cover. Title is changed as shown above.

Table of Contents. Add “Appendix B, REPAIR PARTS AND SPECIAL TOOLSLISTS, page 21.”

Page 21. Appendix B is added as follows:

APPENDIX B

REPAIR PARTS AND SPECIAL TOOLS LISTS(Current as of 14 July 1969)

Sect ion I . INTRODUCTION

1. SCOPE .

This appendix l ists repair parts, special tools, test and supportequipment, and maintenance supplies required for the performance of generalsupport maintenance of the l inear actuator.

2. GENERAL.

This Repair Parts and Special Tools Listing is divided into the followings e c t i o n s :

a. Repair Parts - Sec t ion I I . A l i s t o f repair parts author ized forthe performance of maintenance at the general support level in figure anditem number sequence. Maintenance supplies (MSUP) are listed within thesection in ascending Federal stock number sequence.

b . S p e c i a l T o o l s , Test and Support Equipment - Section III. Notappl i cab le .

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TM 55-2995-223-40C 1

c. Federal Stock Number and Reference Number Index - Section IV, Thissection is divided as follows:

(1) A list of Federal stock numbers in ascending numerical sequence,cross-referenced to the illustration figure number and item number.

(2) A list of reference numbers in ascending alpha-numerical sequence,cross-referenced to the manufacturer’s Federal supply code, i l lustration figurenumber, and item number.

3. EXPLANATION OF COLUMNS.

The following provides an explanation of columns in the tabular lists insect ion I I :

a. Source, Maintenance, and Recoverability Codes (SMR) - Column 1.

(1) Source c o d e . Indicates the selection status and source for thelisted item. Source code(s) used are:

CODE EXPLANATION

P Applies to repair parts which are stocked in or suppliedfrom GSA/DSA, or Army supply system and authorized foruse at indicated maintenance categories.

M

X2

Applies to repair parts which are not procured or stocked,but are to be manufactured in indicated maintenancel e v e l s .

Applies to repair parts which are not stocked, The indicatedmaintenance category requiring such repair parts willattempt to obtain same through cannibalization. Where suchrepair parts are not obtainable through cannibalization,requirements will be requisitioned, with accompanying justi-fication, through normal supply channels.

(2) Maintenance code. Indicates the lowest category of maintenanceauthorized to install the l isted item, Maintenance code(s) used are:

CODE EXPLANATION

O Organizational maintenance

F Direct support maintenance

H General support maintenance

(3) R e c o v e r a b i l i t y c o d e . Indicates whether unserviceable items

2

should be returned for

b . F e d e r a l S t o c k

TM 55-2995-223-40C 1

recovery or salvage. Items not coded are expendable,

Number - column 2 . Indicates the Federal stock numberass igned to the item and will be used for requisitioning purposes, Itemssource coded A, M, or X1 are not assigned a Federal stock number,

c. Descr ipt ion - Column 3 . Indicates the Federal item name and anyadditional description of the item required. The description column containsthe following subcolumns:

(1) Reference number and manufacturer ’ s code . Indicates a partnumber or other reference number for the listed item, followed by theapplicable f ive-digit Federal supply code for manufacturers in parentheses,

(2) Usable on code . N o t a p p l i c a b l e .

d. Unit of Issue (U/I) - Column 4. A two-character alphabetic abbrevia-tion indicating the standard or minimum basic quantity in which the item isi s s u e d ( e . g . : e a , f t , p r , e t c . ) .

e. Quantity Incorporated in Unit - Column 5. Indicates the quant i tyof the item used in the assembly. A “V” appearing in this column in lieuof a quantity indicates that a definite quantity cannot be indicated.

f. Thirty-day GS Maintenance Allowance - Column 6.

(1) The allowance column is divided into three subcolumns, Indicatedin each subcolumn, opposite the f irst appearance of each item, is the totalquantity of items authorized for the number of equipments supported. Subsequentappearances of the same item will have the letters “REF” in this column.Items authorized for use as required, but not for in i t ia l s tockage , areidentified with an asterisk (*) in the allowance column.

(2 ) The quant i tat iverepresent in i t ia l s tockage forsupported.

(3 ) Determinat ion o f

allowance for GS level of maintenance willa 30-day period for the number of equipments

the total quantity of parts required formaintenance of more than 100 of these equipments can be accomplished byconverting the equipment quantity to a decimal factor by placing a decimalpoint before the next to last digit of the number to indicate hundredths, andmultiplying the decimal factor by the parts quantity authorized allowance for51-100 allowance column. Example: authorized allowance for 51-100 equipmentsis 40; for 150 equipments, m u l t i p l y 4 0 b y 1 . 5 0 o r 6 0 p a r t s r e q u i r e d .

g. One-year Allowance per 100 Equipment8/L70ntingency Planning PurposesC o l u n m 7 . Indicates oppos i te the f i rs t apperance o f each i tem, the to ta lquantity required for distribution and contingency planning purposes. The

3

TM 55-2995-223-40C 1

range of items indicates total quantities of all authorized items required toprovide for adequate support of 100 equipments for 1 year.

h. Depot Maintenance Allowance per 100 Equipments - Column 8. Notappl i cab le .

i. I l l u s t r a t i o n - C o l u m n 9 . Illustrations appear in the narrative

portion of this manual. This column is divided as follows:

(1) Figure number - column 9a. Indicates the figure number of theillustration in which the item is shown. Appearances of the letters “MSUP”in this column indicates maintenance supplies located in section II.

(2) Item number - column 9b. Indicates the callout number tore ference the i tem in the i l lustrat ion .

4 . HOW TO LOCATE REPAIR PARTS.

a. When Federal stock number or reference number is unknown:

( 1 ) F i r s t . Find the exploded view il lustration of the assembly orsubassembly to which the repair part belongs.

(2 ) Second. Identify the repair part on the il lustration and notethe il lustration figure and item number of the repair part.

(3) T h i r d . Using the Repair Parts Listing, find the figure anditem number listed in the il lustration column,

b . When Federal stock number or reference number is known:

( 1 ) F i r s t . Using the Index of Federal Stock Numbers and ReferenceNumbers, find the pertinent Federal stock number or reference number, Thisindex is in ascending FSN sequence, followed by a l ist of reference numbersin ascending alpha-numerical sequence, cross -re ferenced to the i l lustrat ionfigure number and item number.

(2 ) Second . Using the Repair Parts Listing, find the figure anditem number listed in the il lustration column referenced in the Index ofFederal Stock Numbers and Reference Numbers,

5 . FEDERAL SUPPLY CODES FOR MANUFACTURERS.

CODE MANUFACTURER

05624 Barber-Colman Company 1300 Rock Street Rockford IL 61101

62983 Vickers Inc Division of Sperry Rand Corp PO Box 302Troy MI 48084

4

CODE

81348

81349

88044

96906

TM 55-2995-223-40C 1

MANUFACTURER

Federal Specifications Promulgated by General ServicesAdministration

Military Specifications Promulgated by StandardizationDiv Directorate of Logistic Services DSA

Aeronautical Standards Group Dept of Navy and Air Force

Military Standards Promulgated by Standardization DivDirectorate of Logistic Services DSA

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TM 55-2995-223-40

6

TM 55-2995-223-40

7

TM 55-2995-223-40C1

SECTION IVFEDERAL STOCK NUMBER

AND REFERENCE NUMBER INDEX

8

TM 55-2995-223-40

By Order of the Secretary of the Arny:

Official:KENNETH G. WICKHAM,Major General, United States Army,The Adjutant General.

W. C. WESTMORELAND,General, United States Army,Chief of Staff.

DISTRISUTION:To be distributed in accordance with DA Form 12-31 requirements for Direct and General

Support Maintenance Instructions for UH-1A- 1B, UH-1C, UH-1D, and AH-1G Aircraft.

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TM 55-2995-223-40

SECTION 1

INTRODUCTION

1. GENERAL INFORMATION. factured by Barber-Colman Company (FMCa. This technical manual comprises 05624 ), Rockford, Illinois. Sections I through

overhaul instructions for linear actuator as- IV of this technical manual contain instruc-sembly, part number SYLC 9190-10, manu- tions for this part number. (See figure 1.)

Figure 1. Lineur Actuutor.

b. Report of errors, omissions and rec-ommendations for improving this publicationby the individual user is encouraged. Reportsshould be submitted on DA Form 2028 (Rec-ommended Changes to DA Publications) andforwarded direct to Commanding General,U.S. Army Aviation Systems Command,ATTN: AMSAV-R-M, P. O. BOX 209, St.Louis, Missouri 63166.

2. PURPOSE.The SYLC 9190-10 linear actuator is an

engine condition actuator which is operated

from a beep switch by the pilot.

3. EQUIPMENT RECORDS.The Army equipment record system and

procedures established in TM 38-750 apply tothis equipment. The applicable forms as re-quired by TM 38-750 shall be used.

4. PAINTING REQUIREMENTS.None.

5. PRESERVATION AND PACKING.Instructions contained in figure 2 are

considered adequate.

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TM55-2995-223-40

Figure 2. Preservation, Packaging, Packing and MarkingRequirement.

4

6. DESCRIPTION.The linear actuator is powered by a

28-vdc split-series motor acting through a105-to-1 gear-reduction train to drive ajackscrew assembly. A movable tube isthreaded onto the jackscrew and is movedin and out by it. A rod end is attached tothe outer end of the movable tube and isad justable ± 0.35 inch in any position.The movable tube is kept from turning bya positive stop which also controls the lim-its of the stroke. By turning a threaded

TM 55-2995-223-40shaft, the stroke is externally adjustablefrom 0.50 to 1.75 inches without changingnominal length. Mechanical stops are locat-ed on the threaded shaft and, because ofthe le f t -hand and r ight -hand threads ,move equidistant from the midpoint whenthe shaft is turned. The positive stop hitsagainst the mechanical stops and travel islimited between the two mechanical stops.

7. LEADING PARTICULARS.Leading particulars of the linear actu-

ator are shown in table 1.

Table V. Leading Particulars

Rated Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71bs.Nominal Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28vdcRated Current (Approx.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 ampStroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.53 inch nominalTiming . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . .5 t0 9 seconds per 1.53

inches at 7 lb loadDuty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ContinuousGear Reduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 to 1Motor Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. Split SeriesMotor Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MagneticRadio Noise Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mcEnclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Explosion proofTemperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65oF to+260oFWeight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 lb. 14oz.Overall Dimensions:

Length:Retracted . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.28 ±0.03 inchesNominal, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.05 ±0.03 inchesExtended . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.82 ±0.03 inches

Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.612 inchesWidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.380 inches

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TM 55-2995-223-40

SECTION II

TEST EQUIPMENT, SPECIAL TOOLS AND MATERIALS

SPECIAL TOOLS. 9. TEST EQUIPMENT.No special tools are required. Test

table 2.e q u i p m e n t r e q u i r e d i s l i s t e d i n

Table 2. Test Equipment Required

PART, MODEL TECHNICALOR MIL DES NOMENCLATURE DESCRIPTION

Part No. 946-29760 Load Travel Fixture, See Figure 6(FMC 05624) SYLC 9190or equivalent

Table 3. Consumable Materials List

ITEM GOVERNMENTNUMBER MATERIAL TYPE OR GRADE SPECIFICATION

1.

2.

3.

4.

5.

6.

7.

8.

Solvent

Solvent

Grease

Grease

Sealant

Sealing Compound

Lubricant

Varnish

Trichlorethylene, Technical

Epoxy Strip T-251-C(FMC 90973)

Aircraft and Instrument

Aircraft and Instrument, with10% Lubricant, MolybdenumDisulfide

RTV108

Paste

Silicone Compound

Electrical, Insulating

0-T-634b

MIL-G-23827

MIL-G-23827

MIL-M-7866

MIL-A-46106

MIL-S-7124

MIL-S-8660b

MIL-I-24092

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TM 55-2995-223-40

SECTION III

GENERAL SUPPORT MAINTENANCE10. DISASSEMBLY.

Disassemble the linear actuator, figure3, as follows:

CAUTIONTag and identify allparts as removed foruse in reassembly

a. C u t a n d r e m o v e l o c k w i r e f r o mscrews (1).

b. Remove four screws (1) and sta-tionary anchor (2). Exercise care whenbreaking seal.

c. Cut and remove lockwire to screws(3) and remove screws.

d. Remove end cap (4). Exercise carein breaking seal.

e. Remove ball bearing (5), and wash-ers (6 and 7).

CAUTIONTag all gear assem-blies at disassemblyto insure sets beingkept together and notintermixed. Do notattempt removal ofoilite bearings fromgear assemblies.

f. Remove washer(8) and gear assembly (9).

g. Remove washer (10) and gear (11).h. Remove gear (12) and washers (13 and 14 ).

i. Filter (15) need not be removed unless re-placement is necessary. Refer to paragraph 13bfor test procedure.

j. Remove insulator (16).

k. Cut and remove lockwire to screws (17).

l. Remove four screws (17).

m. Remove plate (18). Exercise care in re-moving plate and breaking seal. Use knife orsharp instrument.

n. Remove jackscrew assembly (19) byturning in a counterclockwise direction.

o. Loosen nut (21) and turn rod end bearing(20) counterclockwise to remove.

p. Remove nut (22) and washer (23). Removeinstruction plate (24).

q. Loosen nut (25). Run nut (25) and nuts (26and 27) to center of adjusting screw (30) farenough to disengage from housing. List adjustingscrew (30) and associated parts clear from hous-ing. Parts need not be removed from adjustingscrew (30).

r. List positive stop (31) from unit.

s. Remove ball bearing (34) from housing bytapping end of movable tube (32) with a softmallet.

t. Remove movable tube (32) from unit bypulling straight out. Remove quad ring (33) fromhousing.

u. Remove screws (35) and washers (36).

v. Remove cover (37).

w. Do not remove terminal block (41) unlessit is cracked or damaged. Refer to inspection sec-tion. If removal is necessary, do the following.

(1) Unsolder motor leads from one sideof filter and unsolder terminal block leads fromother side of filter.

(2)

(3)

(4)

(5)

NOTEMark which leads go to which terminal to allowfor correct reassembly.

Remove filter (15).

CAUTIONUse sharp-bladedscrewdriver and pryonly on under side ofcasting, as castingmay be chipped byexcessive pressure.

Remove two screws (40).

Remove screw (42) and terminal (43).

Remove terminal block (41).

x. Remove motor (44) from housing (45) byunsoldering leads from filter (15) and lifting itforward.

y. Remove two screws (47) from motor (44)and remove cover (46).

z. Unsolder brushes (48). Remove anddiscard.

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TM 55-2995-223-40

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TM 55-2995-223-40

FIGURE AND QTY PERINDEX NO. PART NUMBER DESCRIPTION ASSY

3-13-23-33-43-53-63-73-83-93-103-113-123-133-143-153-163-173-183-193-203-213-223-233-243-253-263-273-283-293-303-313-323-333-343-353-363-373-383-393-403-413-423-433-443-45-3-463-473-483-49

JYRF 194SYLC 9190-10MS35265-33SYLC 510-1HSIK-FS160LCYRD 272CYRD 272CYRD 311SYLC 522CYRD 311-3SYLC 523SYLC 524CYRD 311-4CYRD 311-3CYZR 736SYLC 566BYRF 627NYRZ1-22-2SYLC 521MDV 14DDYRF 14JYRF 183CYRD 198SYLC 516JYRF 184/3JYRF 168JYRF 169375-20SYLC 529SYLC 519SYLC 515SYLC 520BYRZ 102HSIK-FS160LIMS35275-208AK936A2SYLC 526DYRF 257AN936A6AN505-2R4SYLC 514BYRF 7982104-4DYLM 73501-1SYLC 509-1DYLM 525-5AX505-2R4DYLM 26-1No Number

Machine ScrewStationary AnchorMachine ScrewEnd CapBall BearingFlat WasherFlat WasherFlat WasherGear AssemblyFlat WasherGear AssemblyGear AssemblyFlat WasherFlat WasherRadio Interference FilterInsulatorMachine ScrewCover PlateJ a c k s c r e w A s s e m b l yRod End BearingJam NutHexagon NutLock WasherInstruction PlateHexagon Nut (2RH, 2LH)Nut (RH)Nut (LH)Belleville WasherKeeperAdjusting ScrewPositive StopMovable TubeQuad RingBall BearingMachine ScrewLock WasherCoverHexagon NutFlat WasherMachine ScrewTerminal Assembly MountingMachine ScrewTerminalDrive MotorHousingMotor CoverMachine ScrewContact BrushGear Shafts

41211

ARAR

111211111 “411111114118211111221332111111112

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TM 55-2995-223-40

11. CLEANING.- Clean components of the linear actua-

tor as follows:

a. Clean nonelectrical parts with anapproved cleaning solvent, (itemand dry with compressed air.

WARNINGProvide adequateventilation when us-ing cleaning solvent.

CAUTIONDo not clean gearassemblies (9, 11 or12, figure 3) contain-ing oilite bearings incleaning solvent. Donot allow races ofball bearings to spin

1, table 3)

in compressed airstream when drying.

b. Clean electrical parts with a clean,lint-free cloth.

c. Remove sealer from housing (45),using chemical paint stripper, (item 2, ta-ble 3).

12. INSPECTION:Inspect components of the linear ac-

tuator as follows:

a. Visual ly inspect a l l parts forcracks, excessive wear, deformities, ordamaged threads to determine their suita-bility for reuse.

b. If oilite bearings in gear assem-blies are excessively worn (maximum newinside diameter is 0.1266 inch) replace gearassembly.

Table 4. Wear Limits for Gear Train Components

FIGURE AND MAXIMUM CLEARANCEINDEX NO. NOMENCLATURE (Inches)

3-9 Gear Assembly (ID) 0.0033-11 Gear Assembly (ID) 0.0033-12 Gear Assembly (ID) 0.0033-49 Gear Shafts (OD) 0.003

c. Inspect all gears for excessiveplay between teeth and inspect gear pinsof housing for wear.

13. TESTING.Functionally test components of the

linear actuator as follows:U. Connect drive motor (44, figure 3) to

a 26-volt dc supply containing a single-poledouble-throw center OFF switch and checkfor proper operation an rotation as fol-lows:

( 1 ) V i e w i n g m o t o r f r o m s h a f tend, the shaft shall rotate clockwise withthe plus side of dc power supply connect-ed to red lead and minus connected to themotor case.

(2) Motor shall reach no-load speedof 12,000 rpm within 20 seconds afterstart in either direction.

(3) Running current at no-loadmust not exceed 0.3 ampere in either direc-tion of rotation.

(4) Minimum stall torque shall notexceed 0.075 in. lbs.

(5 ) Check for brake pul l - in at15.5 volts.

b. Check filter (15, figure 3) forbreakdown at 200 volts dc for one minutewith both terminals tied together. Allowcapacitors to charge before reading anddischarge after test. Connect 150 vdc fortwo minutes, terminal to case (terminalstied together); minimum readings shouldbe 20 megohms. Check resistance througheach section. Resistance of each sectionshould be 0.6 ohms maximum.

WARNINGDangerous potentialsup to 200 volts dcare applied in thisstep. Use extremecaution in testing offilter.

14. REPAIR OR REPLACEMENT.The design of the actuator limits re-

pair to the removal of slight dents anddeformities in covers, supports, plates,etc. All other parts found to be defectiveduring visual inspection testing shall bereplaced.15. LUBRICATION.

Lubricate components of the l inear

10

actuator and reassemble as follows:a. Pack ha]] bearings (5 and 34, figure

3) 30 to 50 percent full of grease, (item3, table 3).

b. Lubricate bearings, studs, and gearassemblies forming the gear train with agrease mixture (item 4, table 3). The totalamount of lubricant shall not exceed onelevel teaspoon.

CAUTIONDo not pack geartrain and end capsolid with greasebecause over lubrica-tion will affect opera-tion in extreme tem-peratures.

16. REASSEMBLY.Reassemble the linear actuator as fol-

lows:

a. Install new motor brushes (48, fig-ure 3) and solder leads to motor (44).

b. Replace cover (46) and two screws(47) on motor (44).

c. Assemble motor (44) to housing as-sembly (45). Put three beads of sealant(item 5, table 3) the length of curvedsurface of the casting. Assemble motorto housing so that motor leads extendthrough lead hole in casting and threadedholes in boss of motor line-up with clear-ance holes in casting. Put a temporaryscrew (3) in mounting hole farthest awayfrom motor leads. When tightening thisscrew, be care fu l not to p inch motorleads. Add a bead of sealant (item 5, ta-ble 3) on the outside mating edges ofmotor and casting. Smooth off excess seal-ant. When finished, no daylight must beseen between motor and casting.

d. Mount terminal block assembly (41)to housing (45). Apply a thin, even film ofsealer to mating surface on housing (45).Position terminal block while threading thesolid tinned wire from terminal blockthrough the end hole of terminal on hous-ing. Install screws (40 ).

e. Prepare to solder motor and termin-al block leads to filter (15). The identifica-tion side of the filter is referenced as thetop. Motor leads are soldered to motoridentified side of filter. Motor leads arerouted along the top side of terminals and

TM 55-2995-223-40soldered to that side of eyelet; red to thetop, and black to the bottom terminal.Solder terminal block leads so that leadsso that leads extend straight away fromeyelet; red to the top terminal, and blackto the bottom.

f. Mount filter in cavity of housingApply a bead of sealer (item 6, table 3) tobottom of housing cavity. Position filter incavity, and hold firmly in place while wrap-ping three turns of l/2-inch masking tapearound filter and casting. Allow 24 hours forsealer to cure before removing tape.

g. Solder solid tinned wire to filter lugand housing terminal. Route red and blackterminal block leads in cavity below terminallug of filter. Form solid tinned wire to filterlug eyelet and cut off excess wire. Solderleads to both terminals.

h. Assemble jackscrew (19), bearing(34) and movable tube (32). Slide bearing overthreaded end of jackscrew and onto smoothsurface of jacks crew. A plastic malletand tube to drive against the interbearingrace may be necessary to assembly somebearings. Apply a heavy film of grease tojackscrew threads. Thread jackscrew intomovable tube until approximately half ofthreads are left showing. Jackscrew willthread into one end only.

i. Assembly jackscrew/movable tubeassembly in housing (45), inserting from fil-ter mounting end of housing. Apply a film oflubricant, (item 7, table 3) to quad ring (33).Start movable tube into housing. The packinginstalled in the opposite end of the housingwill create a slight resistance. Apply a film ofgrease (item 4, table 3) to teeth of gear onjackscrew. Continue to push jackscrew untilbearing under gear has nested in housing.

j. Remove masking tape from filter.

k. Assemble components to adjustingscrew (30).

(1) Lay out adjusting screw (30) sothat slotted end is to right of operator.

(2) Assemble four Belleville wash-ers (28) and nut (26) inside keeper (29).Thread this assembly onto slotted end of ad-justment screw with washers toward centerof shaft. Thread down so that left edge ofkeeper is approximately 3/8 inch away fromunthreaded area of adjustment screw.

(3) Thread two nuts (25) onto slot-ted end of adjustment screw keeping curved

11

TM 55-2995-223-40side of nuts toward center of shaft. Threadnuts down close to previous assembly in stepb.

(41 Assemble four Be l le v inewashers (28) and nut (27) inside keeper (29).Thread this assembly onto nonslotted end ofadjustment screw, keeping washers of thisassembly toward center of shaft. Threaddown so that right edge of keeper is approx-imately 3/8 inch away from unthreaded areaof adjustment screw.

(5) Thread two nuts (25A) ontononslotted end of adjustment screw, keepingcurved area of nuts toward center of shaft.Thread nuts down close to previous assemblyin step d.

1. Assemble positive stop (31) andmovable tube assembly (32) inside housing(45).

(1) Apply thin film of grease tosides of slot where positive stop travels insidehousing.

(2) Rotate movable tube until twoflats are straight up. Assemble positivestop (31) over flats and down to tube.

m. Assemble adjustment screw assem-bly (30) into housing (45).

(1) Lay out housing with opencavity up and filter end to the right ofoperator.

(2) Insert slotted end of adjust-ment screw assembly from open cavity side ofhousing and through hole on left end of cav-ity. Lay a thin piece of material (micarta, oldnameplate, brass, etc.) underneath shaft ofnonslotted end. Tap nonslotted end of shaftwith a plastic hammer until assembly will fitinto open cavity of housing. Remove thinpiece of material and insert nonslotted end ofshaft through hole on right end of cavity. Thecenter of shaft will be in slot of positive stop(31).

(3) Thread nut (25) nearest slottedend of snug-to-inside wall of housing cavity.Apply a small amount of sealant, (item 8, ta-ble 3) to threads of adjustment screw, rightbehind nut. Thread other nut (25) so thatsurfaces of the two nuts are together. Holdnut next to housing wall with a 5/16-inchopen-end wrench and tighten other nutagainst this nut with another 5/16-inchopen-end wrench.

(4) Thread nut (25A) on adjust-ment screw assembly nearest filter end of

housing, up to inside wall of housing cavi-ty and then, back it off so that a 0.005-inch feeler gage will go between nut andh o u s i n g w a l l . A p p l y a s m a l l a m o u n t o f sealant (item 8, table 3) to threads ofadjustment screw right behind nut. Threadother nut (25A) so that surface of thetwo nuts are together. Hold nut next toh o u s i n g w a l l w i t h a 5 / 1 6 - i n c h o p e n - e n d wrench and tighten other nut up againstthis nut with another 5/16-inch open-endwrench.

(5) The adjustment screw assem-bly should now turn freely inside cavity ofhousing.

NOTEEnd play inside cavity musthe held from 0.002 to 0.008inch. Measure this with afeeler gage between nut(25A) and housing wall. Ifany adjusting is needed toattain this, adjust two nuts(25A).

(6) Assemble instruction plate (24)over slotted end of adjustment screw sothat it can be read with open side ofhousing down. Assemble lockwasher (23)over end of adjustment screw and downto instruction plate. Apply a small amountof sealant (item 8, table 3) to threads of adjustment screw. Thread nut (22) overend of adjustment screw and down tolockwasher. Hold adjustment screw inplace by putting a screwdriver in the slotand tighten nut with a 5/16-inch open-endwrench.

n. Assemble gear train per figure 4.Apply grease to gear train per paragraph15b.

o. Assemble bear ing (5 ) to end o fjackscrew (19). Shim between bearing andjackscrew gear with flat washers (6 and 7)as required to position bearing on jack-screw so that bearing extends 0.002 to0.006 inch beyond face of end cap. As-semble insulator (16) over filter terminalswhere motor leads are soldered. The filterterminals must extend parallel to filtercase; use a pair of needle-nose pliers toachieve this. Extreme care must be exer-cised when routing leads prior to assem-bling end cap (4). Motor leads must berouted in a way to prevent interferencewith mat ing sur faces o f end cap and

12

housing and to provide clearance for endcap mounting screws. Terminal block leadsmust lay in cavity below solid tinned wiresand terminals, and not against any sharpedges of housings.

p. Assemble end cap (4) to housing(45). Remove screw (3) holding motor. Ap-ply sealer to mating surface of housing(45). Position end cap (4) over filter andbearing to mating surface. Be careful notto crush insulator (16) between matingsurfaces. Assemble two screws (3) throughend cap and into threaded holes of motorend cap. At this time check bearing shimsas specified.

q. Assemble one each, nut (38) andwashers (39) to three threaded studs onterminal block.

r. Assemble anchor (2) to housing (45).Apply a very thin film of sealer (item 8,table 3) to mating surface on end cap (14).Keep sealer away from bearing (5). Posi-tion anchor and assemble four screws (1).

TM 55-2995-223-40

s. Assemble rod end bearing (20) tomovable tube (32). With rounded side ofnut (21) facing anchor end of bearing,start threaded end of anchor into nut. Aminimum of 7/16-inch of threads mustbe left between nut and anchor end. Startanchor threads in movable tube (32) .Thread into movable tube until nut andend of movable tube meet. Do not tightennut at this time.

f. Secure rod end bearing (20) in posi-tion. Position anchor (2) on stationary endof fixture (figure 6). With nut on rod endbearing finger tight, 7/16-inch threadsmust be showing f rom nut to bear ingend. Position bearing end into fixture next,tighten thumb screw, and use wrench totighten nut against movable end.

u. Adjust travel, check end play, tim-ing, and current.

(1) With power supply in OFF po-sition, attach connector to the unit.

(2) Install unit in load travel (test)fixture.

13

TM 55-2995-223-40

Figure 4. Gear Train Installation.

FIGURE AND QTY PER

INDEX NO. DESCRIPTION ASSY

4-8 Flat Washer 14-9 Gear Assembly 14-10 Flat Washer 14-11 Gear Asseembly 24-12 Gear Assembly 14-13 Flat Washer 14-14 Flat Washer 1

(3) Turn torque mechanism of fix- (5) Adjust load to 7 lbs, reading onture ON. Position extend and retract lever to gage of holding fixture. Increase or decreaseOFF. by turning knob on control fixture and re-

(4) Inch the unit (extend or retract) versing the extend and retract lever.so that air cylinders on the fixture are at ( 6 ) A t t a c h e n d p l a y f i x t u r e b a r t omidstroke. movable tube on unit. Adjust to dial indi-

1 4

cater installed in fixture so that a readingcan be determined. Position torque lever toextend, set d ia l on indicator to zero .Reverse lever to retract, reading on indica-tor must not exceed 0.005 from zero.

v. Remove two screws (17) holdingplate. Apply a thin film of sealer (item 8,table 3) to the mating surfaces of thehousing (45). Be careful not to turn ad-justment nuts on adjustment screws be-cause of a possible travel change. Position

TM 55-2995-223-40cover plate (18), secure with four screws(17).

w. Seal area between edge of anchor(2) and end cap (4).

Z. Lockwire complete.

y. Assemble terminal block cover (37).Use two screws (35) and two washers (36)to secure cover to terminal block, Screwsmust be started straight to prevent threadstripping. Torque screws to one inch-pound.

15

TM 55-2995-223-40SECTION IV

FINAL TEST PROCEDURES17. TEST PROCEDURE. a. Attach a seven pound load to mova-

ble tube. Apply 28 volts dc to point E,Mount the linear actuator in a load figure 5, with actuator fully retracted.

travel fixture (figure 6). Loosen nut (22, Actuator shall travel 1.53 ± 0.003 inchesfigure 3) and turn adjusting screw (30) within five to nine seconds.clockwise to full stroke position. Tighten b. Apply 28 volts dc to point R, figurelock nut, Perform the follwoing opera- 5. Actuator shall retract completely withintional tests. five to nine seconds.

Figure 5. Wiring Diagram.

16

TM 55-2995-223-40

c. End play must not exceed 0.005 inch d. Apply 30 volts dc to point E andwith a seven pound reversing load in ei- run unit into positive stop. Apply 20 voltsther direction. dc to point R, unit should back off stop.

Repeat procedure at other end of stroke.

17

TM 55-2995-223-40

1 8

TM 55-2995-223-40

FIGURE ANDINDEX NO.

DESCRIPTIONQTY PERASSY

6-16-2

Baseblock

16-3 Front Plate

16-4 Back Plate

16-5 Bearing Shaft

16-6 Mounting Block

16-7 End Bearing Block

16-8 Bearing Block

16-9 Push Rod

16-10 1

Swivel6-11 1

Adapter6-12 1

Washer6-13 Nut

16-14 Force Gage

16-15 Pneumatic Device

16-16 Front Anchor

26-17 1

Front Pin6-18 Scale (18 in. Rule)

16-19 1

Rear Anchor6-20 16-21

Rear PinBack Support Block

16-22 1

Rear Stud6-23 Nut

11

19

TM 55-2995-223-40

SECTION V

DIFFERENCE DATA SHEETS

(Not applicable)

20

TM 55-2995-223-40

APPENDIX A

REFERENCES

TM 38-750 The Army Equipment Record System

By Order of the Secretary of the Army:

Official:

W. C. WESTMORELAND,General, United States Army,Chief of Staff

KENNETH G. WICKHAM,Major General, United States Army,The Adjutant General.

DISTRIBUTION:To be distributed in accordance with DA Form 12-31 requirements for Direct and

General Support Maintenance Instructions for UH-1A-1B, UH-1C, UH-1D, and AH-1GAircraft.

* U.S. Government Printing Office: 1969- 344-431/693

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