John Deere

MODEL:

3020 SIn 123,000 & 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-TM1005

3020 Tractor

(123,000- )

TECHNICAL MANUAL 3020 Tractor (123,000- )

TM1005 (010CT73) English

John Deere Tractor Works TM1005 (010CT73)

LITHO IN U.S.A.

ENGLISH

CONTENTS

SECTION 10 - GENERAL Group 5 - Specifications Group 10 - Predelivery, Delivery, and After-Sale Services Group 15 - Tune-up Group 20 - Lubrication Group 25 - Separation

SECTION 20 - ENGINE Group 5 - General Information and Diagnosis Group 10 - Cylinder Head and Camshaft Group 15 - Cylinder Block, Liners, Pistons, and Rods Group 20 - Crankshaft, Main Bearings, Flywheel, and Balancer Group 25 - Lubrication System Group 30 - Cooling System Group 35 - Governor and Speed Control Linkage

SECTION 30 - FUEL SYSTEMS Group 5 - Diagnosing Malfunctions Group 10 - Diesel Fuel System Group 15 - Gasoline Fuel System Group 20 - LP-Gas Fuel System

SECTION 40 - ELECTRICAL SYSTEM Group 5 - Information and Wiring Diagrams Group 10 - Charging Circuit Group 15 - Starting Circuit Group 20 - Ignition System Group 25 - Lighting and Accessory Circuits

SECTION 50 - POWER TRAIN Group 5 - Syncro-Range Transmission and PTO Clutches Group 10 - Syncro-Range Transmission Group 15 - Engine Disconnect Clutch Group 20 - Power Shift Transmission Group 25 - Differential Group 30 - Final Drive Group 35 - Hi-Crop Final Drive Group 40 - Syncro-Range PTO Group 45 - Power Shift PTO Group 50 - Belt Pulley Group 55 - Power Front Wheel Drive

SECTION 60 - STEERING AND BRAKES Group 5 - General Information

SECTION 70 - HYDRAULIC SYSTEM Group 5 - General Information, Diagnosis, and Tests

3020 TRACTOR (123,OOO-Up)

Technical Manual TM-100S (Apr-70)

Group 10 - Main Reservoir, Filters, Valves, Oil Cooler, and Oil Reservoir Group 15 - Hydraulic Pumps Group 20 - Power Steering Group 25 - Power Brakes Group 30 - Rockshaft and Implement Hitches Group 35 - Selective Control Valve, Breakaway Couplers, and Remote Cylinders

Copyright 1969 SECTION 80 - MISCELLANEOUS DEERE & COMPANY

Group 5 - Conventional Front Axle Group 10 - Power Front Wheel Drive Axle

Litho in U.S.A.

Moline, Illinois All Rights reserved

Tractors - 3020 TM-1005 (Aug-70)

General 10 Specifications 5- 1

Section 10

GENERAL

CONTENTS OF THIS SECTION

GROUP 5 - SPECIFICATIONS Page

General Tractor Specifications. . . .. 5-1

GROUP 10 - PREDELIVERY, DELIVERY, AND AFTER-SALE SERVICES

Predelivery Service. . . . . . . . . ... 10-1 Delivery Service . . . . . . . . . . . . .. 10-4 After-Sale Inspection . . . . . . . . . .. 10-4

GROUP 15 - TUNE- UP Preliminary Engine Testing ... Engine Tune- Up. . . . . . . . . . . . . . . Final Engine Test ............. . Tractor Tune- Up . . . . . . . . . . . . . .

15-1 15-1 15-3 15-3

GROUP 20 -LUBRICATION Lubrication Chart. . . . . . . . . . Engine Lubricating Oils ......... . T ransmission- Hydraulic Oil. . . . . . . Greases ................... . Storing Lubricants . . . . . . . . . . . . .

GROUP 25 - SEPARATION Removing Roll-Gard Cab . . . . . . . . Installing Roll-Gard Cab ....... . Separating Engine from Clutch Hous-

ing ..........•.......... S epa rat i n g Clutch Housing from

Power Shift Transmission Case .. S epa rat i n g Clutch Housing from

Syncro-Range Transmission Case Removing Engine ............ . Separating Engine from Front End. Removing Final Drive Assembly ... Torques for Hardware . . . . . . . . . Special Tools ............... .

Page

20-1 20-2 20-2 20-2 20-2

25-1 25-2

25-3

25-4

25-6 25-8 25-9

25-10· 25-11 25-11

Group 5

GENERAL TRACTOR SPECIFICATIONS PTO HORSEPOWER (Official test at 2500 engine

rpm with syncro-range transmisSion) Diesel. . . . . . . . . . . . . . . . . . 71.26 hp. Gasoline. . . . . . . . . . . . . . . •. 71.37 hp. LP-gas ................. , 70.66 hp.

ENGINE Type. .. 4-stroke cycle, 4-cylinder in-line,

valve-in-head

Bore and Stroke: Diesel. . . . . . . . . . 4-1/4 x 4-3/4 in. Gasoline and LP-gas .. 4-1/4 x 4-1/4 in.

Displacement: Diesel. . . . . . . . . . . . . . .. 270 cu. in. Gasoline and LP-gas . . . . .. 241 cu. in.

CompreSSion ratio: Diesel ................ . Gasoline ............... . LP-gas ............... .

Firing order . . . . . . . . . . . . . .

Litho in U.S.A.

16.5 to 1 7.5 to 1 9.0 to 1 1-3-4-2

ENGINE-Continued Engine speeds:

Normal slow idle. . . . . . . . . .. 800 rpm Working range. . . . . . .. 1500 to 2500 rpm

COOLING SYSTEM Type. Pressurized system with centrifugal

pump Engine temperature control. .. Heavy-duty

thermostat

LUBRICATION SYSTEM Type Force-feed, pressurized with full-

flow oil filter.

FUEL SYSTEM Diesel. .. Direct injection, inlet metering,

distributing-type. Diaphragm-type fuel pump.

Tractors - 3020 TM-1005 (Aug-70)

Fig. 22-Control Volves

Install JDE-63 engine lift brackets and the engine lift sling.

NO TE: Remove front weights and drain fuel tank to prevent front of tractor from tiPPing.

Remove side frame-to-engine cap screws. Slide engine to rear.

INSTALLATION

Slide engine into place and reverse the re­moval procedures to install engine. Tighten en­gine mounting cap screws and hydraulic pump support and coupler cap screws to specified torque.

If equipped with a Power Front Wheel Drive, install the front drain pipe and the control valve assembly.

General ,Separation

10 25-9

Join the clutch housing to the engine as pre­viously instructed. Check the LP-gas fuel sys­tem for leaks.

SEPARATING FRONT END FROM ENGINE AND TRACTOR

Drain engine cooling system and remove cowl, side shields, grille screens, and hood.

Disconnect battery ground cable (left battery is grounded on diesel tractor).

1. Disconnect hydraulic pump oil seal drain tube (Fig. 23).

2. Remove hydraulic pipe clamps. 3. Disconnect hydraulic pressure pipe. 4. Disconnect hydraulic oil return pipe. 5. Disconnect fuel leak-off pipe. 6. Remove implement attaching bracket and

oil pipe support bracket. 7. Remove hydraulic pipe spacer clamps and

disconnect steering pipes. 8. Disconnect wire from fuel gauge sender

and remove wiring bands to hydraulic pipe. 9. Remove hydraulic pump drive coupler and

detach hydraulic pump support from engine. 10. Close fuel tank shut-offvalve anddiscon-

nect fuel pump inlet pipe. 11. Remove air intake pipe (Fig. 24). 12. Remove radiator hoses. 13. (Syncro-Range) Remove the clamp and

disconnect hydraulic pump inlet pipe. 13. (Power Shift) Remove left-hand step and

disconnect hydraulic pump inlet pipe. On LP-gas engines, disconnect the fuel con­

trol rods from the withdrawal valve and slide rods

Fig. 23-Right-Hand Side of Tractor

Litho in U.S.A.

Tractors - 3020 TM-I005 (Oct-73)

Engines 20 General Inforptation and Diagnosis 5-1

Section 20

ENGINES CONTENTS OF THIS SECTION

GROUP 5 - GENERAL INFORMATION AND DIAGNOSIS

General Information ... Diagnosing Malfunctions . . . . . . . . . Engine Break-In .............. .

Page

5-2 5-2 5-5

GROUP 10 - CYLINDER HEAD, VALVES, AND CAMSHAFT

Diagnosing Malfunctions . . . . . . . .. 10-1 Preliminary Valve Checks. . . . . . .. 10-1 Cylinder Head and Valves . . . . . . .. 10-2 Camshaft . . . . . . . . . . . . . . . . . .. 10-4 Specifications . . . . . . . . . . . . . . .. 10-6 Torques for Hardware .......... , 10-7 Special Tools. . . . . . . . . . . . . . . .. 10-7

GROUP 15 - CYLINDER BLOCK, LINERS, PIS­TIONS, AND RODS

Diagnosing Malfunctions . . . . . . . .. 15-1 Pistons. . . . . . . . . . . . . . . . . . . .. 15-2 Piston Rings. . . . . . . . . . . . . . . .. 15-2 Deglazing Liners. . . . . . . . . . . . .. 15-3 Liners. . . . . . . . . . . . . . . . . . . .. 15-3 Rods. . . . . . . . . . . . . . . . . . . . .. 15-4 Block. . . . . . . . . . . . . . . . . . . . .. 15-4 Specifications . . . . . . . . . . . . . . .. 15-6 Torques for Hardware ........ .. 15-7 Special Tools ................ , 15-7

GROUP 20 - CRANKSHAFT, MAIN BEARINGS, FL YWHEEL, AND BALANCER

Diagnosing Malfunctions . . . . . . . .. 20-1 Checking Crankshaft End Play. . . .. 20-2 Inspecting Flywheel and Housing. . .. 20-1 Inspecting Crankshaft. . . . . . . . . .. 20-2 Checking Main Bearing Clearance. .. 20-2 Rear Oil Seal and Wear Ring . . . . .. 20-3 Front Oil Seal and Wear Sleeve. . . .. 20-3 Engine Balancer General Information 20-4 Engine Balancer Repair. . . . . . . . .. 20-5 Crankshaft Balancer Drive Gear. . .. 20-6 Specifications . . . . . . . . . . . . . . .. 20-7 Torques for Hardware. . . . . . . . . .. 20-7 Special Tools. . . . . . . . . . . . . . . .. 20-7

Litho in U.S.A.

GROUP 25 - LUBRICATION SYSTEM

Diagnosing Malfunctions . . . . . . . . . Oil Pump .................. . Pressure Regulating Valve and Filter Oil Filter .................. . Oil Cooler .................. . Adjusting Engine Oil Pressure . . . . . Specifications ............... . Torque for Hardware . . . . . . . . . ..

GROUP 30 - COOLING SYSTEM

Radiator and Fan . . . . . . . . . . . . . . Fan Belt Adjustment. . . . . . . . . . . . Water Pump ................ . Water Manifold and Thermostats ... . Specifications . . . . . . . . . . . . . . . . Torques for Hardware .......... . Special Tools ................ .

Page

25-1 25-1 25-1 25-1 25-3 25-4 25-4 25-4

30-1 30-1 30-1 30-4 30-4 30-4 30-4

GROUP 35 - GOVERNOR AND SPEED CON­TRoL LINKAGE

Governor . . . . . . . . . . . . . . . . . .. 35-1 Diagnosing Malfunctions . . . . . . . .. 35-1 Repair. . . . . . . . . . . . . . . . . . . .. 35-2 Installation and Assembly . . . . . . .. 35-3 Governor Adjustment . . . . . . . . . .. 35-4 Carburetor Adjustment. . . . . . . . .. 35-4 Injection Pump Adjustment. . . . . . .. 35-5 Speed Control Linkage Repair. . . . .. 35-5 Speed Control Linkage Adjustment. .. 35-6 Specifications . . . . . . . . . . . . . . .. 35-7 Special Tools. . . . . . . . . . . . . . . .. 35-8

Tractors - 3020 TM-1005 (Oct-73)

Fuel Systems 30 Diagnosing Malfunctions 5-1

Section 30

FUEL SYSTEM CONTENTS OF THIS SECTION

Page

GROUP 5 - DIAGNOSING MALFUNCTIONS Diagnosing Malfunctions . . . . . . . . 5-1

GROUP 10 - DIESEL FUEL SYSTEM Air Cleaner ............ . Restriction Indicator Switch. . . Fuel Tank. . . . . . .. . ..... Fuel Pump ....... . Fuel Filter(s) ..... . Bleeding Fuel System. Fuel Injection Pumps

Roosa Master Model CB General Information .. Remov~. . . . . . . . . . . . . . . . . Repair .............. . Installation. . . . . . . . . . . . . Adjusting Automatic Speed

Advance ............ . Roosa Master Model JDB

General Information .. . Removal. ......... . Repair ........... . Installation. . . . . . . . . Adjusting Automatic Speed

Advance ..... Fuel Injection Nozzles

General Information Diagnosing Malfunctions. Removal. . . ..... Repair .... Installation . . .

Specifications . . . Torques for Hardware . Special Tools . . . . . . .

GROUP 15 - GASOLINE FUEL SYSTEM Air Cleaner ................ . Fuel Tank

Removal ... Repair ... Installation . . . . .. ..... .

Fuel Pump General Information ..... . Diagnosing Malfunctions .... . Removal. . . . . .. . ........ . Repair ... Inst~lation . . . .. ......... .

Litho in U.S.A.

10-1 10-2 10-3 10-3 10-4 10-4

10-5 10-5 10-5 10-6

10-6

10-6 10-7 10-7 10-7

10-8

10-8 10-8 10-9 10-9 10-9

10-10 10-10 10-10

15-1

15-1 15-1 15-1

15-2 15-2 15-2 15-2 15-2

Page

GROUP 15 - GASOLINE FUEL SYSTEM (Cont.) Fuel Filter

General Information Removal .. Repair ... Installation

Carburetor General Information Diagnosing Malfunctions .. . Removal ............ .

Marvel-Schebler Carburetor Operation. Repair ......... . Installation . . Adjustments .

Zenith Carburetor Operation. Repair ..... Installation . . . . . . . . . . . . . Adjustments. . . . . . . . . . . . .

Specifications and Speci~ Tools.

GROUP 20 - LP-GAS FUEL SYSTEM Tank, Valves, and Gauges Gener~ Information Removal .. Repair ........ .

Fuel Strainer General Information Repair ........ .

Converter Diagnosing M~functions. Testing .. Removal .......... . Repair ....... . Inst~lation . . . . . . . .

Carburetor Diagnosing Malfuntions Repair ..... . Adjustment .. . Specifications. .

15-2 15-2 15-2 15-2

15-3 15-3 15-3

15-4 15-7

15-10 15-10

15-11 15-15 15-19 15-19 15-20

20-1 20-1 20-1

20-1 20-1

20-2 20-2 20-2 20-2 20-3

20-3 20-4 20-4 20-4

Tractors - 3020 TM-I005(Oct-73)

Electrical System Information and Diagrams

40 5-1

Section 40

ELECTRICAL SYSTEM CONTENTS OF THIS SECTION

Page

GROUP 5 - INFORMATION AND DIAGRAMS General Information ............ , 5-2 Precautions . . . . . . . . . . . . . . . . .. 5-2 Circuit Breakers. . . . . .. . . . . . . .. 5-2 Fusible Link . . . . . . . . . . . . . . . .. 5-2 Key Switch . . . . . . . . . . . . . . . . .. 5-3 Wiring Diagrams. . . . . . . . . . . . .. 5-3 Battery Connections . . . . . . . . . .. 5-23 Power Front Wheel Drive. . . . . . .. 5-24 Specifications . . . . . . . . . . . . . . .. 5-26

GROUP 10 - CHARGING CIRCUIT General Information. . . . . . . . . . .. 10-1 Precautions . . . . . . . . . . . . . . . .. 10-1 Tests and Diagnosis .......... " 10-1 Battery . . . . . . . . . . . . . . . . . . .. 10-1 Wiring Tests. . . . . . . . . . . . . . . .. 10-2 Testing with Voltmeter. . . . . . . . .. 10-2 Testing Alternator Field Circuit

on Tractor. . . . . . . . . . . . . . . .. 10-2 Testing Alternator on Tractor Using

Voltmeter ................ . Testing Alternator with Regulator on

Tractor ................. . Testing Regulator ............ . Replacing Regulator . . ........ . Repair .................... . Bearings .................. . Rotor .................... . Brushes .................. . Diodes ................... . Stator .................... . Assembly •................. Tests After Assembly . . . . . . ... . Installation . . . . . . . ......... . Specifications Torques ... Special Tools

GROUP 15 - DELCO-REMY STARTING CIRCUIT

General Information . . . . . . . ... . Tests and Diagnosis . . ........ . Start-Safety Switch Adjustment ... . High ReSistance Tests . . . ...... . Solenoid Tests . . ............ . Starter Circuit Relay Tests ..... . Starter No Load Test ......... . Repair ................... . Solenoid Switch . . . . ......... . Overrunning Clutch Drive . . .... . Armature ................. . Field Coils . . . . . . . . . . . . . . . .. Brushes .................. . Bushings .................. . Assembly .................. . Pinion Clearance ............. . Installation . . . . . . . . . . . . . . . . . . Specifications . . . . . . . . . . . . . . .. Torques ................... .

Litho in U.S.A.

10-3

10-3 10-3 10-3 10-3 10-4 10-5 10-5 10-5 10-6 10-6 10-7 10-7 10-8 10-8 10-8

15-1 15-1 15-1 15-2 15-2 15-2 15-2 15-3 15-3 15-3 15-4 15-4 15-4 15-4 15-4 15-5 15-5 15-5 15-6

GROUP 17 - JOHN DEERE STARTING CIRCUIT

General Information ........... . Diagnosis and Tests ........... . High Resistance Test .......... . Solenoid Tests ............... . No Load Test ............... . Starter Circuit Relay Test ....... . Start-Safety Switch Adjustment .... . Repair .................... . Bushings .................. . Armature .................. . Overrunning Clutch Drive ....... . Field Coils . . . . ............. . Brushes ................... . Solenoid .......•............ Assembly .................. . Installation . . . . . . . . . . . . . . . . . . Specifications ............... . Special Tools .... " .......... .

GROUP 20 - IGNITION SYSTEM General Information ........... . Resistor ................... . Coil ...................... . Spark Plug ................. . Tests and Diagnosis ........... . Testing for High Resistance ...... . Testing Distributor Off Tractor .... . Repair .................... . Housing ................... . Contact Points ............... . Tests After Assembling ........ . Installation . . . . . . . . . . . . . . . . . . Timing Distributor .......... . Emergency Timing . . ......... . Specifications . . . . . . . . . ..... . Torques .................. . Tune-Up Data .............. . Special Tools . . . . .......... .

GROUP 25 - LIGHTING AND ACCESSORY CIRCUITS

Lights ................ . Light Switch . . . . . . . . .... . Instrument Lighting ....... . Tests and Diagnosis ....... . Light Adjustment . . . . . ........ . Accessories and Instruments ..... . Fuel Gauge ................. . Indicator Lamp Relay (Power Shift

Tractor) ................. . Carburetor Solenoid ........... . Injection Pump Solenoid ........ . Horn ..................... . Additional Accessories .......... . Cab Relay .................. . Cab Blower Switch. . ..... . Wipers ..... Specifications . . ..

Page

17-1 17-1 17-2 17-2 17-3 17-3 17-3 17-4 17-4 17-4 17-5 17-5 17-6 17-6 17-6 17-7 17-7 17-8

20-1 20-1 20-1 20-1 20-1 20-2 20-3 20-3 20-3 20-5 20-5 20-5 20-5 20-5 20-5 20-6 20-6 20-6

25-1 25-1 25-1 25-1 25-2 25-2 25-3

25-3 25-3 25-3 25-3 25-4 25-4 25-4 25-4 25-5

Power Train 50 Tractors - 3020 TM-I005 (Oct-73) Clutches for Syncro-Range Transmission and PTO 5-1

Section SO

POWER TRAIN CONTENTS OF THIS SECTION

GROUP 5 - C L UTC HES FOR SYNC RO-RANGE TRANSMISSION AND PTO

General Information. . . . . . . . . . . 5-2 Diagnosing Malfunction. . . . . . . . . 5-2 Clutch Shafts and Clutch Controls

Removal ............... ' .. Repair ................. . Adjustment. . . . . . . . . . . . . . .

Clutch Assembly

5-2 5-3 5-6

Removal. . . . . . . . . . . . . . . . . . 5-6 Repair. . . . . . . . . . . . . . . . . . . 5-7 Installation. . . . . . . . . . . . . . . . 5-8 Adjustment. . . . . . . . . . . . . . . . 5-8

Specifications. . . . . . . . . . . . . . . . 5-9 Special Tools. . . . . . . . . . . . . . . . 5-9

GROUP 10 - SYNCRO-RANGE TRANSMISSION General Inrormation . . . . . . . . . .. 10-1 Diagnosing Malfunction ....... " 10-2 Removal. . . . . . . . . . . . . . . . . .. 10-2 Repair . . . . . . . . . . . . . . . . . . .. 10-3 Installation . . . . . . . . . . . . . . . .. 10- 5 Adjustment . . . . . . . . . . . . . . . .. 10-8 Specifications .............. " 10-8 Special Tools. . . . . . . . . . . . . . .. 10-9

GROUP 15 - ENGINE DISCONNECT CLUTCH General Information ........ " 15-1 DiagnOSing Malfunction. . ..... " 15-1 Removal. . . . . . . . . . . . . . . . . .. 15-1 Repair. . . . . . . . . . . . . . . . . . .. 15-2 Installation ............... " 15-2 Adjustment ............... " 15-3 Specifications. . . . ......... " 15-4 Special Tools. . . . . . . . . . . . . . .. 15-4

GROUP 20 - POWER SHIFT TRANSMISSION General Information . . . . . . . . . .. 20-1 Diagnosing Malfunction . . . . . . . .. 20-12 Testing. . . . . . . . . . . . . . . . . . .. 20-13 Repair

Speed Selector Assembly ..... " 20-15 Pedal Valve and Oil Pressure

Regulating Valve .......... . Control Valve ............. . Clutch Pack . . . . . . . . . . . . . . . Planetary Pack . . . . . . . . . . . . . Reduction Gear Train ........ . Park Pawl ............... .

Adjustments. . . . . . . . . . . . . . . . . Specifications. . . . . . . . . . . . . . . . Special Tools. . . . . . . . . . . . . . ..

Litho in U.S.A.

20-17 20-18 20-21 20-23 20-26 20-26 20-28 20-29 20-31

GROUP 25 - DIFFERENTIAL General Information. . . . . . . . . . .. 20-1 Removal. . ................ , 25-1 Repair. . . . . . . . . . . . . . . . . . . .. 25-1 Adjustment and Testing. . . . . . . .. 25-3 Specifications. . . . . . . . . . . . . . .. 25-4

GROUP 30 - FINAL DRIVE General Information. . . . . . . . . . .. 30-1 Removal. . . . . . . . . . . . . . . . . .. 30-1 Repair. . . . . . . .. . . . . . . . . . . .. 30-1 Installation. . . . . . . . . . . . . . . . ., 30- 2 Specifications ............... , 30-2 Special Tools. . . . . . . . . . . . . . .. 30-2

GROUP 35 - HI-CROP FINAL DRIVE General Information. . . . . . . . . .. 35-1 Removal. . . . . . . . . . . . . . . . . .. 35-1 Repair ................... , 35-2 Specifications. . . . . . . . . . . . . .. 35-3

GROUP 40 - SYNCRO-RANGE PTO General Information. . . . . . . . . .. 40-1 DiagnOSing Malfunction. . . . . . . .. 40-1 Removal. . . . . . . . . . . . . . . . . .. 40-1 Repair. . . . . . . . . . . . . . . . . . .. 40- 2 Specifications. . . . . . . . . . . . . . .. 40-4

GROUP 45 - POWER SHIFT PTO General Information. . . . . . .. . . .. 45-1 Diagnosing Malfunction. . . . . . . . .. 45-1 Removal. . . . . . . . . . . . . . . . . .. 45-1 Repair. . . . . . . . . . . . . . . . . . . .. 45-2 Adjustment. . . . . . . .. . . . . . . . .. 45-4 Testing. . . . . . . . . . . . . . . . . . .. 45-4 Specifications. . . . . . . . . . . . . . .. 45-5

GROUP 50 - BELT PULLEY General Information. . . . . . . . . .. 50-1 Disassembly. . . . . . . . . . . . . . .. 50-1 Repair. . . . . . . . . . . . . . . . . . .: 50-2 Adjustments. . . . . . . . . . . . . . .. 50-2 Specifications. . . . . . . . . . . . . .. 50-4

GROUP 55 - POWER FRONT WHEEL DRIVE General Information. . . . . . . . . . .. 55-1 Diagnosing Malfunction. . . . . . . . .. 55-6 Testing. . . . . . . . . . . . . . . . . . . .. 55-6 Removal .................. " 55-7 Repair. . . . . . . . . . . . . . . . . . . .. 55-8 Assembly. . . . . . . . . . . . . . . . . .. 55-12 Adjustments ............... " 55-13 Specifications. . . . . . . . . . . . . . .. 55-14

Tractors - 3020 TM-I005 (Oct-73)

Hydraulic System 70 General Information, Diagnosis, and Tests 5-1

Section 70 HYDRAULIC SYSTEM

CONTENTS OF THIS SECTION

GROUP 5 - GENERAL INFORMATION, DIAG-NOSIS AND TESTING Page

General Information . . . . . . . . . . . 5-3 Leakage Tests . . . . . . . . . . . . . . . 5- 3 Hydraulic Tests

Transmission Pumps . . . . . . . . . 5-4 Main Hydraulic Pump. . . . . . . . . 5-4 Rockshaft. . . . . . . . . . . . . . . . . 5-5 Selective Control Valve. . . . . . . . 5-5

Pressure Tests . . . . . . . . . . . . . . 5-6 Diagnosing Malfunctions. . . . . . . . . 5-7 Specifications. . . . . . . . . . . . . . . . 5-7

GROUP 10 - MAIN RESERVOIR, VALVES, OIL COOLER AND OIL RESERVOIR

Reservoir and Filters ........ " 10-1 Hydraulic Oil Relief and Check Valves

Syncro-Range Tractor ....... . Power Shift Tractor ........ .

Pressure Control Valve

10-1 10-2

General Information . . ..... " 10-4 Removal and Repair . . . . . . . .. 10-5 Assembly and Adjustment. . . . .. 10-5

Oil Cooler. . . . . . . . . . . . . . . . .. 10-6 Oil Reservoir (tank) . . . . . . . . . .. 10-6 Specifications . . . . . . . . . . . . . .. 10-7

GROUP 15 - HYDRAULIC PUMPS Transmission Pumps

Syncro-Range ...... . Power Shift . . . . .. . . .

Main Hydraulic Pump

15-1 15-2

Diagnosing Malfunctions. . . . . .. 15-3 Operation. . . . . . . . . . . . . . . .. 15-4 RemOVal and Repair ......... , 15-5 Inspection .............. " 15-5 Installation . . . . . . . . . . . . . .. 15-6 Adjustment . . . . . . . . . . . . . .. 15-8

Specifications . . . . . . . . . . . . . 15-9

GROUP 20 - POWER STEERING General Information .......... . Operation ................. . Diagnosing Malfunctions ........ . Steering Valve Removal and Repair .. Steering Valve Inspection and Assem-

bly ..................... . Steering Valve Adjustment ...... . Steering Motor Removal ........ . Steering Motor Repair and Assembly. Specifications ............... .

Litho in U.S.A.

20-1 20-2 20-4 20-8

20-5 20-6

20-12 20-12 20-14

GROUP 25 - POWER BRAKES Page

General Information. . . . . . . 25-1 Brake Operation. . . . . . . . . 25-1 Diagnosing Malfunctions . . . . . . . .. 25-3 Cylinders, Plates, and Disks. . .. .. 25-3 Brake Valve Removal and Repair. . . 25-3 Brake Valve Inspection and Assembly 25-5 Brake Pedal Adjustment. . . . . . . .. 25-5 Bleeding Brakes. . . . . . . . . . . . .. 25-6 Brake Accumulator. . . . . . . . . . .. 25-6 Brake Accumulator Pre-Charging. . . 25-7 Brake Accumulator Testing. . . . .. 25-7 Specifications . . . . . . . . . . . . . .. 25-8

GROUP 30 - ROCKSHAFT AND IMPLEMENT HITCHES

General Information and Operation .. Diagnosing Malfunctions . . . . . . . . . Removal .................. . Repair ................... . Assembly .................. . Rockshaft Valve Assembly

Repair .................. . Assembly ................ .

Load Control Arm ............ . Installation. . . . . . . . . . . . . . . . Adjustment. . . . . . . . . . . . .

3-Point Hitch ............... . Quik-Coupler ............... . Power Weight- Transfer Hitch .... . Specifications ............... .

30-1 30-4 30-5 30-5 30-5

30-7 30-8

30-10 30-11 30-12 30-14 30-16 30-17 30-20

GROUP 35 - SELECTIVE CONTROL VALVE AND REMOTE CYLINDER

General Information .......... . Diagnosing Malfunctions . . . . . . . . . Removal ................ . Inspection and Repair . . . . . . . . . . Assembly .................. . Adjustment . . . . . . . . . . . . . . . . . Remote Cylinder . . . . . . . . . Specifications . . ............ .

35-1 35-4 35-5 35-6 35-7 35-8

35-11 35-14

70 15-6

Hydraulic System Hydraulic Pumps

Check piston springs for cracked or broken coils. Springs should compress to 1.62 inches at 34 to 40 lbs. Springs MUST match within 1. 5 lbs. of each other. Springs are replaced as aset. Be sure that color code is the same on all new springs in the set.

VALVES

Check discharge valve assembly and seat. If NECESSARY, carefully remove seatwithJDH-40 seat puller. Be sure that puller catches between seat and housing.

Fig. 9-lnstal/ing Discharge Valve Seat

To install seat, use JDH-39 seat driver and gently drive on seat shoulder until driver bottoms on finished face of discharge valve bore.

Check inlet valve assemblies in pump hous­ing. Measure valve lift to determine if valve spring retainer is excessively worn. Liftshould be 0.0600 to 0.0800 inch. A cocked retainer can indicate a broken retaining ring.

MODIFIED MODIFIED T 17690 VALVE GUIDE DRIVER

Fig. IO-Driving Out Inlet Valve Assembly

Litho in U.S.A.

Tractors - 3020 TM-1005 (Oct-73)

Remove inlet valve assemblies (Fig. 10) ONLY if there is evidence of damage. Drive inlet valve assembly from housing with the aid of a discarded R27157 discharge valve guide (with chamfer ground off) and a driver with shoulder on it to fit guide.

Install new inlet valve assembly by preSSing in until end of guide is 0.5330 to 0.5370 inch from finished face of housing.

STROKE CONTROL AND CRANKCASE OUTLET VALVES

Disassemble stroke control and crankcase outlet valve assemblies (Fig. 12) ONLY if there is evidence of a malfunction. Use care when driving valve sleeves (9 and 24). Use a driver that is recessed in the center and will drive only on the outer edge of the sleeve.

Check stroke control valve and crankcase out­let valve assemblies (Fig. 12) for burrs, weak springs, eroded seats, leaking packings, or plugged pump crankcase filter screens.

The stroke control valve spring should com­press to 3.30 inches at 125 to 1551bs. The crank­case outlet valve spring should compress to 2.20 inches at 45 to 55 lbs. pressure.

ASSEMBLY

NOTE': Always install new O-rings,packings, and oil seals. Use kit available. Dip all parts in clean Type 303 Special-Purpose Oil before as­sembly.

Install pump shaft bearing cup in housing.

Install quad ring and oil seal in pump hous­ing. Coat lips of seal with SAE multipurpose­type grease. Install seal with supplier's iden­tification faCing outward, using JDH-18 sea 1 driver.

NOTE': Do not POSition oil seal beyond snap ring groove. To do so restricts oil relief outlet causing oil seal failure.

Install thrust washer, spacer, and roller bearings on splined end of pump shaft. Place needle bearing race over pump shaft cam and insert needle bearings around inner circum ference of race. Grease bearings to hold them in place. Install thrust washer, spacer, and roller bearings on pump shaft.

Tractors - 3020 TM-1005 (Apr-70)

Miscellaneous 80 Conventional Front Axle 5-1

Section 80

MISCELLANEOUS

CONTENTS OF THIS SECTION

GROUP 5 - CONVENTIONAL FRONT AXLE

General Information. . . . . . . ... . Removal .................... . Repair. . ................... . Installation. . . . . . . . . . . . . . . . . . . Specifications ....... " ........ . Torques for Hardware ........... . Special Tools ................. .

Page

5-2 5-2 5-2 5-2 5-3 5-3 5-3

GROUP 10 - POWER FRONT WHEEL DRIVE AXLE

General Information. . . . . . .. . . . .. Removal ................... . Repair ..................... . Installation. . . . . . ... . . . . . .... . Specifications ....... " ....... . Torques for Hardware ........ 0 ••

Special Tools ................ .

Page

10-1 10-1 10-2 10-2 10-2 10-2 10-2

Group 5

CONVENTIONAL FRONT AXLE

~'-9 UV-s

~-7

~-7 G)?-s f

R 14442

1 - Special Bolt 2 - Lock Washer 3 - Nut 4 - Cop Screw

9

5 - Axle Pivot Brocket 6 - Front Axle

Litho in U.S.A.

7 - Bushing 8 - Pivot Pin 9 - Grease Fitting

10 - Special Washer 11 - Knuckle Dust Excluder 12 - Knuckle

Fig. I-Exploded View of Fixed Tread Front Axle

~-10

~-7

13 - Spring Pin 14 - Thrust Washer 15 - Pivot Pin Clomp 16 - Dowel Pin 17 - Cop Screw and Washer