John Deere

MODEL:

112 Lawn & Garden Tractor SIN 250,001 & Up

THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF JOHN DEERE OR IT'S SUCCESSORS. JOHN DEERE AND IT'S SUCCESSORS

ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL.

TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS.

JD-S-SM2096

http://www.jensales.com/products/john-deere-112-lawn-garden-service-manual-sn-250-001-and-up.html

1

SERVICE MANUAL

112 LAWN AND GARDEN TRACTOR

(Serial No. 250,001- )

CONTENTS

SECTION 10 - GENERAL Group 5 - Tractor Identification Group 10 - Specifications Group 15 - Tune-Up and Adjustment Group 20 - Fuel and Lubricants

SECTION 20 - ENGINE Group 5 - General Information Group 10 - Cylinder Head, Valves, and Breather Group 15 - Minor Engine Recondition Group 20 - Major Engine Recondition Group 25 - Specifications

SECTION 30 - FUEL SYSTEM Group 5 - General Information Group 10 - Carburetor Group 15 - Air Cleaner Group 20 - Fuel Strainer and Gas Tank Group 25 - Fuel Pump Group 30 - Specifications

(All information, illustrations, and specifications contained in this service manual are based on the lat­est information available at the time of publication. The right is reserved to make changes at any time without notice.)

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SECTION 40- ELECTRICAL SYSTEM Group 5 - General Information Group 10 - Cranking System Group 15 - Ignition System Group 20 - Charging System Group 25 - Electric PTO Clutch Group 30 - Electric Lift Group 35 - Specifications

SECTION 50 - POWER TRAIN Group 5 - General Information Group 10 - Clutch, Brake and Variable-Speed

Drive Group 11 - Manual PTO Clutch Group 15 - 4-Speed Transaxle Group 20 - Specifications

SECTION 60 - MISCELLANEOUS Group 5 - Steering Linkage Group 10 - Front Wheels and Axles Group 15 - Lift Linkage

Section 10

GENERAL

Group 5 TRACTOR IDENTIFICATION

TABLE OF CONTENTS

Page

GROUP 5 - TRACTOR IDENTIFICATION Serial Numbers ......................... 5-2

Tractor ............................. 5-2 Engine .............................. 5-2

Identification Codes ..................... 5-2 Tractor Code . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 Tire Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

Vintage Information ..................... 5-2

GROUP 10 - SPECIFICATIONS Engine Specifications .................. , 10-1 Tire Specifications ..................... 10-1 Tractor Specifications. . . . . . . . . . . . . . . . . .. 10-2 Bolt Torque Chart ...................... 10-3 Set Screw Seating Torque Chart ........... 10-3 Rear Wheel Weight Bolt Size Chart ........ 10-4

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Page

GROUP 15 - TUNE-UP AND ADJUSTMENT Preliminary Engine Testing. . . . . . . . . . . . . .. 15-1 Minor Tune-Up Guide ................... 15-1 Major Tune-Up Guide ................... 15-2 Common Adjustments .................. 15-2

GROUP 20 - FUEL AND LUBRICANTS Fuel ................................. 20-1 Lu bricants . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-1 Capacities ............................ 20-1 Type of Lubricant ...................... 20-1 Service Intervals ....................... 20-1 Changing Crankcase Oil ................. 20-2 Changing Transaxle Oil .................. 20-2 Repacking PTO Clutch Bearing ........... 20-3 Lubricating Grease Fittings .............. 20-4

10 General Tractor - 112 (Serial No. 250,001- ) 10-2 Specifications SM-2096 - (Aug-72)

TRACTOR SPECIFICATIONS

TRANSM ISS ION Type .......................................................................... Transaxle Gear Seleetions ....................................................... 4 Forward-1 Reverse

TRAVEL SPEEDS (.® 3600 RPM Engine Speed) 1st Gear ............................................................ Variable, .4 to 1.0 mph 2nd Gear ............................................................ Variable, 1.3 to 2.9 mph 3re Gear ............................................................ Variable, 2.4 to 5.0 mph 4th Gear ............................................................ Variable, 3.4 to 7.4 mph Reverse ............................................................. Variable, 1.8 to 3.3 mph

BRAKES Type , ................................................................ Band, Pedal-operated Parking ............................................................ Hand Lock to Foot Brake

CLUTCH ...................................................................... V-Belt System

PTO CLUTCH ................................................................ Electromagnetic

STEERING ................................................................... Enclosed Gear

LIFT ................................................................ Electric, ReCirculating Ball

CAPACITIES Fuel Tank ............................................................... 1-3/4 U.S. Gallons Crankcase ..................................................................... 3 U.S. Pints Transaxle ................................................................. 3-1/2 U.S. Pints

SHIPPING WEIGHT (With GT-3 Tires) ................................................... 774Ibs.

DIMENSIONS Wheelbase ......................................................................... 46 in. Overall Length. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 66-3/4 in. Overall Height ....................................................................... 41 in. Overall Width (maximum) ......................................................... 41-1/2 in.

WHEEL TREAD Front .............................................................................. 31 in. Rear (GT -3 Tires) ............................................................ 27 in. or 33 in.

(GT -5 Tires) ........................................................ 28-1/2 in. or 31 in.

BATTERY

Cold Reserve JofmD .. r& SCI Cranking Ca~city

Voltage Part Number Group Amps (Minutes at OaF -20°F 25 amps)

12 AM31186 22F 255 200 55

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Section 20 ENGINE

Group 5 GENERAL INFORMATION AND DIAGNOSIS

CONTENTS Page

GROUP 5 - GENERAL INFORMATION Description .............................. 5-3 Engine Analysis ........................... 5-4

Preliminary Engine Checks ................ 5-4 Preliminary Engine Tests ................. 5-4 Compression Test ....................... 5-4 Crankcase Vacuum Test ................. 5-5

Diagnosing Malfunctions ................... 5-6

GROUP 10 - CYLINDER HEAD, VALVES, AND BREATHER

General Information ...................... 10-1 Disassembly ............................ 10-2

Disassembling Engine .................. 10-2 Removing Valves ...................... 10-3

Valve Analysis ........................... 10-3 I nspection and Repair ..................... 10-4

Inspecting Cylinder Head ................ 10-4 Inspecting Valve Springs ................ 10-5 I nspecting Valves and Valve Guides ....... 10-5 I nspecting Breather .................... 10-6 Replacing and Reaming Valve Guides ...... 10-6 Reconditioning Valves and Seats .......... 10-7 Replacing Exhaust Valve Insert ........... 10-7 Lapping Valves ........................ 10-8 Adjusting Valve Clearance ............... 10-8

Installation ............................. 10-9 I nstalling Valves ....................... 10-9 Assembling Breather ................... 10-9 I nstalling Cylinder Head ................. 10-9 I nstalling Carburetor and Governor Linkage 10-10 Installing Exterior Components .......... 10-10

Adj ustment . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-11 Adjusting Throttle Cable ................ 10-11 Adjusting Throttle Linkage .............. 10-11 Adjusting High and I die Speed ........... 10-11 Adjusting Governor Sensitivity ........... 10-11

GROUP 15 - MINOR ENGINE RECONDITION General Information ...................... 15-1 Disassembly ............................ 15-2

Removing Engine ...................... 15-2 Removing Cylinder Ridge ................ 15-3 Removing Piston and Connecting Rod ...... 15-3 Removing Piston Rings and Pin ........... 15-3

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Page

Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15-4 Piston and Piston Rings ................. 15-4 Stuck, Broken, or Plugged Rings .......... 15-4 Overall Wear to Piston and Rings .......... 15-4 Scored Piston ......................... 15-5 Physical Damage to Pistons . . . . . . . . . . . . .. 15-5 Connecting Rod and Crankshaft Journal .... 15-6

I nspection and Repair ..................... 15-7 Inspecting Crankshaft Journal and Connecting

Rod ............................... 15-7 I nspecting Crankshaft Journal Clearance ... 15-7 I nspecting Cylinder ..................... 15-8 Deglazing Cylinder ..................... 15-8 I nspecting Piston ...................... 15-8 I nspecting Piston Pin ................... 15-9

Assembly ............................. 15-10 Installing Piston Pin ................... 15-10 I nstalling Piston Rings ................. 15-10 I nstalling Piston and Connecting Rod ...... 15-10 Installing Oil Pan ...................... 15-11 I nstalling Cylinder Head ................ 15-11 I nstalling Engine in Tractor .............. 15-11

Run-In Procedure ....................... 15-12

GROUP 20 - MAJOR ENGINE RECONDITION General Information ...................... 20-1

Automatic Compression Release (ACR) Camshaft ........................... 20-2

Dissassembly ........................... 20-3 Removing Engine ...................... 20-4 Engine Service Support Stand ............ 20-4 Removing Exterior Components ........... 20-5 Removing Valves ...................... 20-5 Removing Cylinder Ridge ................ 20-5 Removing Piston and Connecting Rod ...... 20-6 Removing Piston Rings and Pin ........... 20-6 Removing Flywheel ..................... 20-6 Removing Bearing Plate ................. 20-6 Removing Crankshaft ................... 20-7 Removing Camshaft .................... 20-7 Removing Governor Assembly ............ 20-7

20 Engine Tractor - 112 (Serial No. 250,001- ) 5-2 General Information SM-2096- (Sep- 73)

CO NTENTS-Continued

Page Page

Analysis ................................ 20-8 Assembly ........................... 20-14 Piston and Piston Ring .................. 20-8 Assembling Governor Assembly ........ 20-14 Stuck, Broken, or Plugged Rings .......... 20-8 I nstalling Crankshaft Bearings ......... 20-15 Overall Wear to Piston and Rings .......... 20-8 I nstalling Camshaft .................. 20-15 Scored Piston ......................... 20-9 Installing Crankshaft ................. 20-15 Physical Damage to Pistons .............. 20-9 I nstalling Bearing Plate ............... 20-16 Connecting Rod and Crankshaft Journal ... 20-10 I nstaliing Oil Seals .................. 20-16 Bearings ............................ 20-10 I nstalling Piston Pin ................. 20-17

I nspection and Repair .................... 20-11 I nstalling Piston Rings ............... 20-17 Inspecting Crankshaft and Connecting Rod I nstaliing Piston and Connecting Rod .... 20-17

Journal ........................... 20-11 I nstaliing Oil Pan .................... 20-18 Checking Crankshaft Journal Clearance ... 20-11 Instaliing Valves and Breather Assembly. 20-18 Inspecting Crankshaft Bearings and Seals . 20-11 Installing Cylinder Head .............. 20-18 Inspecting and Repairing Cylinder ........ 20-11 I nstaliing Flywheel .................. 20-18 Deglazing Cylinder .................... 20-12 Installing Exterior Components ........ 20-19 I nspecting Piston ..................... 20-12 I nstaliing Engine in Tractor ............ 20-20 Inspecting Piston Pin .................. 20-13 Run-In Procedure ..................... 20-20 I nspecting Camshaft and Camshaft Pin .... 20-13 Inspecting and Repairing Governor Assembly20-13 GROUP 25 - SPECIFICATIONS I nspecting Cross Shaft Assembly ......... 20-14 Specifications ......................... 25-1 Replacing Ring Gear ................... 20-14 Torque for Hardware .................... 25-3

Special Tools .......................... 25-3

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Engine 20 10-8 Cylinder Head, Valves, and Breather

Lapping Valves

Fig. 20-Lapping Valves

Coat face of valve sparingly with a fine grade of valve grinding compound. Use a vacuum cup tool, Fig. 20, to grip top of valve and rotate valve in an os­cilating circular motion on valve seat.

Lift valve from seat every eight or ten strokes to keep compound equalized on surface of valve seat. Continue valve lapping operation until a uniform lap­ping ring appears around entire surface of valve face. When a good surface is attained, wash all parts with solvent to remove all traces of lapping compound. Dry parts thoroughly.

Note position of valve seat marked on valve face. The lapping mark made by the seat after lapping should appear on or near the center of the valve face.

Adjusting Valve Clearance

Valve grinding changes the tappet and valve clear­ance. After grinding or installing new valves, check clearance as follows:

1. Place valves, without springs, into valve guides.

2. Rotate crankshaft until piston is at top dead center on the compression stroke. Both valves must be completely closed.

It is important that the piston be in this position to insure that the exhaust valve tappet is not riding on the automatic compression release mechanism.

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Tractor - 112 (Serial No. 250,001- ) SM-2096 - (Aug-72)

Fig. 21-Checking Valve Clearance

3. Holding valves firmly on seats, check clearance between bottom of each valve stem and its tappet with a feeler gauge, Fig. 21.

Intake valve clearance should be 0.008 to 0.010 inch. Exhaust valve clearance should hf! 0.017 to 0.020 inch.

Fig. 22-Adjusting Tappet Clearance

4. With a wrench on the flat area of the tappet and a wrench on the tappet adjusting screw, Fig. 22, turn the screw up or down until the proper clearance is obtained.

Section 30

FUEL SYSTEM Group 5

GENERAL INFORMATION CONTENTS

GROUP 5 - GENERAL INFORMATION GROUP 15 - AIR CLEANER Principle of Operation ... , . . . . . . . . . . . . . .. 5-2 General I nformation . . . . . . . . . . . . . . . . . . . . .. 15-1 Diagnosing Malfunctions ................ 5-3 Servicing Air Cleaner ..................... 15-1

Cleaning ............................. 15-1 GROUP 10 - CARBURETOR Pre-Cleaner ........................... 15-1 General Information .. . . . . . . . . . . . . . . . . . . .. 10-1 Heavy-Duty Air Cleaner ................... 15-2 Disassembly and Repair ................... 10-1

Disassembling Carburetor ............... 10-1 GROUP 20 - FUEL STRAINER AND GAS TANK Cleaning Carburetor .................... 10-1 Fuel Strainer ............................ 20-1 I nspecting Carburetor ................... 10-2 Gas Tank ............................... 20-1

Assembly .............................. 10-3 I nstalling Float Valve ................... 10-3 GROUP 25 - FUEL PUMP I nstaliing Float and Fuel Bowl ............ 10-3 General Information ...................... 25-1

Installation ............................. 10-3 Repair ................................. 25-1 Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-4

Carburetor ............................ 10-4 GROUP 30 - SPECIFICATIONS ............. 30-1 Governor and Throttle. . . . . . . . . . . . . . . . . .. 10-4

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Section 40

ELECTRICAL SYSTEM Group 5

GENERAL INFORMATION

CONTENTS

Page

GROUP 5-GENERAL INFORMATION Principal of Operation .................... 5-2 Wiring Diagram ......................... 5-3 Testing ............................... 5-6 Diagnosing Malfunctions ................. 5-6

GROUP 10-CRANKING SYSTEM Pri nci pal of Operation . . . . . . . . . . . . . . . . . .. 10-1

Battery ............................ 1 0-1 I gnition Switch ...................... 10-2 Solenoid ........................... 10-2 Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-3

Testing .............................. 10-4 Battery ............................ 10-4 Cranking System ..................... 10-5 Ignition Switch ...................... 10-5 Safety-Start Switches. . . . . . . . . . . . . . . . .. 10-5 Starter Solenoid ..................... 10-6 Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-6 Armature. . . . . . . . . . . . . . . . . . . . . . . . . .. 10-7

Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-8 Battery ............................ 10-8 Starter ............................. 10-8

Repair ............................... 10-9 Battery ............................ 10-9 Starter . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1 0-11

GROUP 15-IGNITION SYSTEM Principal of Operation ................... 15-1

Ignition Coil ......................... 15-2 Breaker Points ...................... 15-2 Condenser. . . . . . . . . . . . . . . . . . . . . . . . .. 15-2 Spark Plug .......................... 15-3 Ignition Switch ...................... 15-3

Testing .............................. 15-4 Preliminary Engine Test ............... 15-4 Test Equipment ...................... 15-4 Battery ............................ 15-4 Coil ............................... 15:'4 Condenser .......................... 15-5

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Page

Repair ............................... 15-5 Spark Plug .......................... 15-5 I gnition Coil. . . . . . . . . . . . . . . . . . . . . . . .. 15-6 Breaker Points ...................... 15-6

Adjustments .......................... 15-7 Breaker Poi nts ...................... 15-7 Timing Engine (Static) ................ 15-7 Timing Engine (Light) ................. 15-8

GROUP 20-CHARGING SYSTEM Principal of Operation ................... 20-1

Alternator .......................... 20-1 Rectifier-Regulator ................... 20-2

Testing .............................. 20-2 Circuit Wiring ....................... 20-2 Alternator and Regulator .............. 20-2 Charging System ..................... 20-3

AC Voltage Test ................... 20-3 DC Voltage Test ................... 20-3 DC Amperes Test .................. 20-4

Repair ............................... 20-4 Alternator Stator . . . . . . . . . . . . . . . . . . . .. 20-4

GROUP 25-ELECTRIC PTO CLUTCH Principal of Operation ................... 25-1 Testing .............................. 25-2 Repair ............................... 25-3

GROUP 30-ELECTRIC LI FT ACTUATOR Principal of Operation ................... 30-1 Testing Electric Lift ..................... 30-2 Installation ........................... 30-3 Adjustment ........................... 30-3 I nstalling Electric Lift Helper

Spring Kit .......................... 30-4

Section 50 POWER TRAIN

Group 5 GENERAL INFORMATION

CONTENTS

Page GROUP 5 - GENERAL INFORMATION

Description ...... , ..................... 5-2

GROUP 10 - CLUTCH, BRAKE AND VARIABLE SPEED DRIVE

Principle of Operation ................... 10-1 Variable Speed Control Lever. . . . . . . . . . . 10-1 Clutch or Clutch-Brake Pedal . . . . . . . . . .. 10-1 Variator . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1 0-2

Preliminary Diagnosis of Malfunctions. . . . .. 10-3 Variable Speed Drive ................. 10-3 Brakes. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-3

Diagnosing Malfunctions ................ 10-4 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-6

Replacing Primary V -Belt . . . . . . . . . . . . .. 10-8 Replacing Secondary V -Belt. . . . . . . . . .. 10-10 Inspecting V-Belts .................. 10-10 Cleaning V-Belts .................... 10-10 Servicing Variator ................... 10-11 Brakes ............................ 10-16

Adjustments . . . . . . . . . . . . . . . . . . . . . . . .. 101-9 Linkage Adjustment ................. 10-19 Variator Linkage Adjustment .......... 10-21 Clutch-Brake Pedal Adjustment ........ 10-21 Brake Pedal Adjustment .............. 10-22 Adjusting Clutch Override. . . . . . . . . . . .. 10-22 Belt Guide Adjustment ............... 10-22 Specifications . . . . . . . . . . . . . . . . . . . . .. 10-23 Special Tools ....................... 10-23

GROUP 11 - MANUAL PTO CLUTCH Principle of Operation . . . . . . . . . . . . . . . . . .. 11-1 Diagnosing Malfunctions ................ 11-1 Disassembly .......................... 11-2 Inspection ............................ 11-2 Assembly ............................ 11-3 Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . .. 11-4

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Page GROUP 15 - 4-SPEED TRANSAXLE

Principle of Operation . . . . . . . . . . . . . . . . . .. 15-1 Gear Shift Pattern . . . . . . . . . . . . . . . . . . . . .. 15-2 Diagnosing Malfunctions ................ 15-3 Disassembly .......................... 15-4

Removing Transaxle . . . . . . . . . . . . . . . . .. 15-5 Opening Transaxle ..................... 15-6

Removing Internal Components ......... 15-6 Disassembling Shifter Lever ............ 15-7

I nspection and Repair ................... 15-8 I nspecting Gears and Shafts ........... 15-8 I nspecting Oil Seals and O-Rings ........ 15-9 Inspecting Transmission Case .......... 15-9 I nspecting Shifter Assembly. . . . . . . . . . .. 15-9 I nspecting Drive Blocks . . . . . . . . . . . . . .. 15-9

Assembly ........................... 15-10 Differential Assembly (Bevel Gear) ..... 15-10 Bearings .......................... 15-10 I n put Shaft and Gear. . . . . . . . . . . . . . . .. 15-11 Idler Gear and Pinion Shaft ............ 15-11 Output Shaft and Gear ............... 15-12 Shifter Shaft ....................... 15-12 Idler Gear, Pinion, and Thrust

Washer ......................... 15-14 Reverse Idler Shaft and Gear .......... 15-14 Installing Reverse Idler, Idler Gear

Assembly, and Spacer ............. 15-14 I nstalling Cluster Gear and Thrust

Washer ......................... 15-15 Installing Differential ................ 15-15 Placing Cover on Case ............... 15-16 I nstalling Seals ..................... 15-16 I nstalling Axle Supports .............. 15-17 Positioning Shifter Forks .............. 15-17 Assembling Shifter Lever.; ........... 15-17 Installing Transaxle .................. 15-17

Torque for Hardware ................... 15-19 Special Tools ......................... 15-19

50 Power Train 15-16 4-Speed Transaxle

Placing Cover on Case

Fig. 43-Closing Case

Install right hand case half over axle and input shaft as illustrated in Figure 43. Shake case slightly to align shafts and shifter assembly. Also, a short turn of the input shaft will help align shafts and gears.

To close the last one-half inch, tap the right-hand case horizontally as shown in Figure 43. If case will not close, reach through round hole in right-hand case with a screwdriver and move shifter rods. This will help align shifter rods so they will fall into shifter rod sockets in right-hand case.

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Tractor - 112 (Serial No. 250,001- ) SM-2096 (Aug-72)

I nstalling Seals

Fig. 44-lnstalling Retainers and Seals

Insert eight socket head screws, Figure 44, and tighten to 120 in-Ibs torque.

Install retainer and new seal with special oil seal cone tool, page 15-19. Shim stock may be substituted for the tool to prevent cutting seal during installation. The seal is properly installed when the open face of seal is facing inward toward the gears. Figure 44.

Section 60

ISCELLAN s Group 5

STEERING LINKAGE

CONTENTS

Page Page

GROUP 5 - STEERING LINKAGE Adjustments ........................... 5-9 General Information . . . . . . . . . . . . . . . . . . . 5-2 Steering Gear ........................ 5-9 Steering Analysis ....................... 5-3 Adjusting Toe-In ..................... 5-10

Seal and Retainer . . . . . . . . . . . . . . . . . . . . . 5-3 Adjusting Steering Linkage ............. 5-10 Housing ............................. 5-3 Torque for Hardware .................... 5-11 Spindle ............................. 5-4 Special Tools .......................... 5-11 Ball Joints ........................... 5-4

Diagnosing Malfunctions ................. 5-5 GROUP 10 - FRONT WHEELS AND AXLES Repair ................................ 5-6 Introduction .......................... 10-1

Removing Steering Wheel and Steering Gear 5-6 Repair ............................... 10-1 Disassembling Steering Gear ............ 5-7 Removing Front Wheels ............... 10-2 I nspecting Steering Gear Parts .......... 5-7 Removing Spindle from Axle ............ 10-2

Assembly ............................. 5-7 Inspecting Bearings .................. 10-2 Assembling Steering Gear .............. 5-7 Installation ........................... 10-2 I nstalling Steering Gear ................ 5-8 I nstalling Axle . . . . . . . . . . . . . . . . . . . . . .. 10-2

I nstalling Spindles .................... 10-3 I nstalling Bearings and Wheels ......... 10-3

Torque for Hardware .................... 10-3 Special Tools ........................ " 10-3

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