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FireHawk® M7Audi-Larm™Audible AlarmMAINTENANCE AND REPAIR

TAL 8012 (L) Rev. 1 © MSA 2008 Prnt. Spec. 10000005389(I) Mat. 10093084Doc. 10093084

2TAL 8012 (L) Rev. 1 - 10093084

REPLACEMENT KITS AND PARTS LIST

Parts List and Exploded View: 2216/4500 psi

Item P/N Description

1 10038417 Audi-Larm Body2 10062086 Fitting, Nipple, 2216 psi2a 10062087 Fitting, Nipple, 4500 psi3 93031 Washer, CGA Nut4 10062084 Coupling Nut, 2216 psi4a 10062085 Coupling Nut, 4500 psi5 633553 Nipple O-Ring6 10038031 Dust Cover Assembly7 10041011 Washer8 10037952 Screw9 10036291 Pressure Relief Valve* 2216 psi10 485829 Bell11 54197 Lock Washer (2)12 635245 Screw, #8-32 x 7/16 LG (2)13 10044574 Striker with Pellet14 85055 Striker Spring15 85048 Piston Assembly16 85052 Piston Plug17 635953 Piston Bore O-Ring18 635954 Piston Nose O-Ring19 66395 Piston Plug O-Ring20 68523 Retaining Ring21 455941 Spring, 2216 psi21a 474352 Spring, 4500 psi22 474369 Adjusting Nut23 485070 URC Adapter with O-Ring24 804382 High Pressure Hose*25 638166 O-Ring26 635278 Back-up ring27 63198 O-Ring

809028 Christo-Lube Lubricant (2 cc tube)28907 Teflon Tape29787 Loctite 22226875 Loctite 271494992 Liquid Silicone Lubricant

*Includes Back-Up and O-Rings as needed.

FIREHAWK M7 AUDI-LARM AUDIBLE ALARM

3 TAL 8012 (L) Rev. 1 - 10093084

Thread Tape

25

10

11

1

9 9a

14

32a

2

4

5

12

4a

13

15

16

17

18

19

20

21 21a22

23

78

6

24 26 27

Loctite 271

Christo-Lube

Christo-Lube

Christo-Lube

Liquid Silicone

Christo-LubeLoctite 222

Christo-Lube

Christo-Lube

Exploded View 2216/4500 psigAudi-Larm Audible Alarm

4TAL 8012 (L) Rev. 1 - 10093084

REPLACEMENT KITS AND PARTS LIST

Parts List and Exploded View: 3000 psi

Item P/N Description

1 10045593 Audi-Larm Housing2 10062086 Nipple3 93031 Washer, CGA Nut4 10062084 Coupling Nut,5 633553 Nipple O-Ring6 10038031 Dust Cover Assembly7 10041962 Washer, Flat, SST8 10037952 Screw, 10-32 UNF, SST9 10036291 Pressure Relief Valve*10 485829 Bell11 54197 Lock Washer (2)12 635245 Screw, #8-32 x 7/16 LG (2)13 476441 Sintered Filter14 80495 Screen Holder15 10043943 SAE Plug, Size 6 with O-Ring16 10043945 Check Valve*17 10044574 Striker with Pellet18 85055 Striker Spring19 85049 Piston Assembly20 85052 Plug, Piston21 635953 Piston Bore O-Ring22 635954 Piston Nose O-Ring23 66395 Piston Plug O-Ring24 68523 Retaining Ring25 474352 Spring26 474369 Adjusting Nut27 485070 URC Adapter with O-Ring28 804382 High Pressure Hose*29 638166 O-Ring30 635278 Back-Up Ring31 63198 O-Ring

809028 Christo-Lube Lubricant (2 cc tube)28907 Teflon Tape29787 Loctite 22226875 Loctite 271494992 Liquid Silicone Lubricant

*Includes Back-Up and O-Rings as needed.

5 TAL 8012 (L) Rev. 1 - 10093084


Teflon tape5

7

8

6 27

25

2420

2319

21

22

17

18

1

10

12

1116

15

14

1343

28

26

9

2

Loctite 222

Christo-Lube

Christo-Lube

Christo-Lube

Liquid Silicone

Loctite 271

29 30 31

Christo-LubeChristo-Lube

Exploded View 3000 psigAudi-Larm Audible Alarm


AUDI-LARM AUDIBLE ALARM DISASSEMBLY

Only MSA-certified personnel may maintain and repair theapparatus. Use only replacement parts from MSA toassure proper performance. Thoroughly understand allinstructions, inspection procedures, cautions, andwarnings that pertain to the breathing apparatus.

Most repairs require standard tools. However, certainspecial tools, tapes, lubricants, and a tester from MSA arerequired. See the Required Tool List.

Follow maintenance procedures exactly. Deviation fromwritten repair procedures is unacceptable, unlessapproved by authorized MSA personnel.

Relieve all pressure from the system. Closethecylinder valve. Be sure that nothing blocks theregulator outlet. Open the bypass valve to releasetrapped air. Failure to follow this warning can result inserious personal injury or death.

Removing the Bell

1. Use a flat-blade screwdriver to remove the screws andlock-washers holding the bell to the Audi-Larmhousing.

2. Discard the screws andwashers.

Do not remove the bell from the alarm housing unlessthe bell is damaged. If the bell is damaged replace itwith a new bell. Failure to follow this warning canresult in serious personal injury or death.

Removing the Dust Cover

1. Use a 1/8” hex wrench to remove the screw.

Removing the Nipple O-Ring

1. Use the o-ring removaltool to remove theo-ring.

Note: Be careful not to scratch the o-ring groove.

2. Discard the o-ring

6TAL 8012 (L) Rev. 1 - 10093084

Table of Contents

Audi-Larm Assembly DisassemblyBell..................................................................................6Dust Cover .....................................................................6Nipple O-Ring.................................................................6Coupling Nut ..................................................................7Audi-Larm Audible Alarm ...............................................7Relief Valve .....................................................................8Check Valve on a 3000 psig System .............................8Plug and Sintered Filter on a 3000 psi System .............8URC Coupling ................................................................8

Audi-Larm Audible Alarm ReassemblyURC Coupling ................................................................9Plug and Sintered Filter on a 3000 psig System ...........9Check Valve (3000 psig system) ....................................9Relief Valve ..................................................................10Audi-Larm Audible Alarm .............................................10Coupling Nut and Nipple..............................................11Nipple O-Ring...............................................................12Dust Cover ...................................................................12Bell................................................................................12

Audi-Larm Audible Alarm TestingPosiChek3 Machine ......................................................12Troubleshooting............................................................13


Removing the Coupling Nut1. Remove the nipple.

a. Secure the alarm body with a wrench or vise.

Note: Use protective sleeves on the jaws of the vise.

b.Use a 7/16” deep-well socket tounscrew the nipple.

c. Remove the nipple and coupling nut.

d.Remove the washer.

e. Clean Teflon tape residue from the thread.

Disassembling the Audi-Larm Audible Alarm

1. Remove the Audi-Larm coupling nut from the Audi-arm Audible Alarm.

2. Use a large flat-bladescrwdriver to removethe adjusting screw.

3. Remove the spring.

4. Use retaining-ringpliers to remove thering. Apply onlyenough pressure toremove the ring.

a. Discard the retaining ring.

5. Unscrew and removethe piston plug ando-ring.

a. Discard the o-ring.

6. Screw the extractiontool (P/N 482426) intothe back of the piston.

Be careful not to damage the piston valve seat on theopposite end of the piston.

7. Remove the piston bygently rocking andpulling the extractiontool.

7 TAL 8012 (L) Rev. 1 - 10093084


8. Remove the extraction tool.9. Remove and discard piston o-ring and the piston plu10. Turn the alarm over to remove the striker and spring

from the alarm housing.11. Discard striker and valve pellet.

12. Remove and discardthe o-ring beneath thealarm housingshoulder.

13. Wipe all dirt and grease from the striker.

Removing the Relief Valve

If label on Relief Valve is missing or damaged, install anew Relief Valve. Failure to follow this warning canresult in serious personal injury or death.

1. Use an 11/16” wrenchto loosen and removethe relief valve.

2. Discard the o-ring.

Removing the Check Valve on a 3000 psi System

1. Use an 11/16” wrenchto unscrew the checkvalve.

Removing the Plug and Sintered Filter on a 3000 psiSystem

1. Use an 11/16” wrenchto unscrew and removethe plug.

2. Use a 3/8” nut driverto loosen and removethe filter and filterholder.

3. Discard the filter.

Be careful not to round hex head or snap off filterinside the alarm body.

Removing the URC Coupling

1. Place the Audi-Larm block in a vise.

Note: Use protective sleeves to avoid damaging theblock.

2. Use a 1” deep-well socket to loosen the URCAdapter from the alarm body.

8TAL 8012 (L) Rev. 1 - 10093084


REASSEMBLING THE AUDI-LARM AUDIBLE ALARM

Installing URC Adapter in the Alarm Body

Note: Ensure that the air mask passes annual and monthlytightness and function tests. See P/N10093079, FireHawk®

M7 and M7 Responder® Air Mask Maintenance andRepair: Introduction for instructions.

1. Install a new URC Adaptera. Secure the Audi-Larm body in a vise.

Note: Use protective sleeves to keep from damaging theblock.

2. Screw the coupling into the alarm body by hand.

3. Use a torque wrenchand 1” deep-wellsocket to tighten to70–75 ft lbs.

Installing the Plug and Sintered Filter on a 3000 psiSystemPlug P/N 10043943Filter P/N 476441Holder P/N 80495

1. With the filter flangedown, slide the non-threaded end of filterholder onto the filter.

2. Insert the filter andholder into a 3/16” nutdriver.

3. Insert the filter holder,filter, and nut driver intothe alarm plug port.

4. Finger tighten.

Note: To prevent over-tightening, use a nut driver, not asocket and ratchet wrench.

Do not over-tighten, round hex head, or snap filter offinside the alarm body.

5. Install a new plug and o-ring.a. Apply a small amount of Christo-Lube lubricant tothe o-ring.

6. Screw plug into the alarm body port and hand-tighten.Be careful not to cross-thread the plug.

7. Use a torque wrench and 11/16” socket to tighten to200-250 in lbs.

Installing the Check ValveP/N 10043945

1. Remove protective cap.2. Install the o-ring and back-up ring.

a. Apply a small amount of Christo-Lube lubricant tothe o-rings and back-up rings.

b. Protect the threadswith threadprotector, tape orpaper.

9 TAL 8012 (L) Rev. 1 - 10093084


c. Slide the o-ring overthe thread.

3. Screw the check valve into the alarm body port andhand-tighten. Be careful not to cross-thread the checkvalve.

4. Use a torque wrenchand 11/16” socket totighten the check valveto 200-250 in lbs.

Installing the Relief Valve1. Remove the protective cap.2. Install a new o-ring

a. Apply a small amount of Christo-Lube lubricant tothe o-ring.

3. Screw the relief valve into the alarm body and handtighten.

4. Use a torque wrenchand 11/16” socket totighten the relief valveto 200-250 in lbs. 2216psig relief valve shown.See 3000 psigexploded view for 3000psig relief valvelocation)

Note: Be careful not to cross-thread the relief valve.

Reassembling the Audi-Larm Audible AlarmPiston Replacement Kit P/N 10090908Audi-Larm Audible Alarm Maintenance Kit P/N 10045831Striker Replacement Kit P/N 10044574

Note: Replace all o-rings. Reuse of o-rings is the mostfrequent cause of alarm malfunction. Apply a smallamount of Christo-Lube lubricant to each o-ring beforeinstalling.

1. Install the o-ring underthe shoulder inside thealarm housing. Use theo-ring removal tool topush the o-ring intoplace.

2. Apply a small amount of Silicone Lubricant (P/N494992) to the striker shaft.

3. Place the spring over the striker.

4. Insert the spring andstriker into the alarmhousing.

5. Ensure that the striker extends through the hole andcan touch the bell.

6. Install new o-rings on the piston and the piston plug.

7. Screw the plug into thepiston and tighten.

8. Apply a small amount of Christo-Lube lubricant to thebeveled shoulder of the piston assembly.

10TAL 8012 (L) Rev. 1 - 10093084


9. Insert the piston intothe alarm housing andpress it into place.

Note: Be careful not to damage the piston seat. Thestriker will extend through the forward hole toward thebell.

10. Use retaining-ringpliers to install the newretaining ring flat sideout.

Note: The ring must seatin the groove locatedabout 1/16" above thepiston. Use the o-ringremoval tool if necessaryto push the ring into thegroove. If the ring is bent,or does not fit tightly,replace it.

11. Apply a small amount of Christo-Lube lubricant toboth ends of the spring.

12. Insert the adjustingspring into the alarmhousing.

13. Insert the screw intothe alarm housing andtighten about 1-1/2turns.

14. Verify proper Audi-Larm operation by performing therequired ring-up, set point, and ring-down testsspecified in the Audi-Larm Audible Alarm Testing.

Note: After testing, place one drop of Loctite 222 on theadjusting screw threads.

15. Check the alarm for air leaks. See Leak Testing-Audi-Larm P/N 10093091).

Reassembling the Coupling Nut and NippleCoupling Nut 2216/3000 psig: P/N 10062084

4500 psig: P/N 10062085Nipple 2216/3000 psig: P/N 10062086

4500 psig: P/N 10062087

1. Reinstall the Coupling Nut

a. Apply Teflon tape tothe nipple thread.

2. Apply a small amount of Christo-Lube lubricant to thenew washer.

3. Slide the new washeronto the threaded endof the nipple.

11 TAL 8012 (L) Rev. 1 - 10093084


4. Slide the coupling nut onto the threaded end of thenipple.

a. Screw the couplingnut and nipple intothe Audi-Larm body.

b.Use a torque wrenchand 7/16” deep wellsocket to tighten thenipple to 25 ft lbs.

Do not over-tighten to prevent damage the Audi-Larmbody or the nipple thread.

Installing the Nipple O-RingP/N 10090910

Roll the new o-ring into thegroove until seated.

Note: An improperly seated o-ring can cause an air leak.

Installing the Dust CoverP/N 10090909

1. Insert screw with washer through tether into Audi-Larm body.

2. Tighten with a 1/8” hex wrench.

Installing the BellP/N 10090907

1. Align the bell with the boss on the alarm housing. Therim of the bell must not touch the alarm housing.

2. Remove residual Loctite thread locker.3. Apply one drop of Loctite 271 (P/N 26875) into each

hole.4. Insert screws with lock-washers (P/N 54197) into the

Audi-Larm body and tighten.

5. Ensure that the bell istight.

AUDI-LARM™ AUDIBLE ALARM TESTING

MSA recommends that C.A.R.E. facilities use theupgraded Biosystems PosiChek3 SCBA Test Benches totest Audi-Larm accuracy.

Upgrades to the PosiChek3 Machine are available throughBiosystems:54-21-A12 - EP (Enhanced Precision) Upgrade Only, and54-21-A13 - Sound Detection System Upgrade Only, and54-21-A14 - EP and Sound Detection System Upgrade

Combined.

MSA also authorizes the use of the Audi-Larm tester (P/N10045522) to evaluate the accuracy of the Audi-LarmAudible Alarm.

12TAL 8012 (L) Rev. 1 - 10093084


If upgrades have not been performed to theBiosystems PosiChek3 Test Bench, MSA requiresC.A.R.E. facilities to use the Audi-Larm Tester (P/N10045522) to check the accuracy of the Audi-LarmAudible Alarm during each flow test of the SCBA.Failure to follow this warning can cause Audi-Larmmalfunction, resulting in serious personal injury ordeath.

Contact Biosystems (www.biosystems.com) forinformation regarding other necessary upgrades.

13 TAL 8012 (L) Rev. 1 - 10093084

14TAL 8012 (L) Rev. 1 - 10093084

TROUBLESHOOTING

Trouble Probable Cause Remedy

Audi-Larm does not ring whenpressurized.

Audi-Larm leaks

Audi-Larm does not fully pressurize

Audi-Larm does not start to ring atrequired setting

Audi-Larm does not ringcontinually all the way down towithin color code mark or lower.

Audi-Larm bell is loose

Dirt or foreign matter may haveaffected the o-ring seals inside theAudi-Larm or the proper operation ofthe Audi-Larm striker.

Internal Leak

Audi-Larm insert o-ring is leaking

Leakage at the pipe thread fitting

Cylinder pressure too low

Internal leak

External leak

Adjustment too high

Adjustment too low

Internal leak

Install new screws and washers.Refer to PIN P/N 10041212 (SingleScrew) and PIN P/N 10041213(Dual Screw)

Overhaul Audi-Larm.

Overhaul Audi-Larm.

Overhaul Audi-Larm and replacepiston.

Try to hand tighten coupling nutfurther onto the cylinder valve. Ifthis is unsuccessful, the insert o-ring may need to be replaced.

Completely leak test all fittings onthe Audi-Larm assembly. Relievepressure, and then tighten ifnecessary.

Replace cylinder with a fullypressurized cylinder.


Replace coupling nut nipple O-ring.

Adjustment: Turn the adjustingscrew counter clockwise (out) 1/8turn. Retest the Audi-Larm.

Adjustment: Turn the adjustingscrew clockwise (in) 1/8 turn.Retest the Audi-Larm.

Overhaul Audi-Larm.


Note: If after performing the remedy, the Audi-Larm still does not perform properlyduring the Audi-Larm test, it must be replaced.

Note: Overhaul Kit P/N 10045831

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