John Deere

MODEL:

1520 Tractor

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-TM1012

CONTENTS

SECTION 10 - GENERAL Group 5 - Specifications Group 10 - Predel ivery, Delivery, and After-Sale

Services Group 15 - Tune-Up and Adjustment Group 20 - Lubrication Group 25 - Separation

SECTION 20 - ENGINE Group 5 - General Information, Diagnosis, and

Tests Group 10 - Cylinder Head, Valve Train, and Cam­

shaft Group 15 - Cylinder Block, Liners, Pistons, and

Rods Group 20 - Crankshaft, Main Bearings, and Fly-

wheel Group 25 - Timing Gear Train Group 30 - Lubrication System Group 35 - Cooling System Group 40 - Governor and Speed Control Linkage

SECTION 30 - FUEL SYSTEM Group 5 - Diagnosing Malfunctions Group 10 - Fuel I njection System Group 15 - Gasoline Fuel System

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

1

1520 TRACTOR TECHNICAL MANUAL

TM-1012 (Jan-71)

SECTION 50 - POWER TRAIN Group 5 - Clutches Group 10 - Hi-Lo Shift Unit Group 15 - Reverser Group 20 - Collar Shift Transmission Group 25 - Differential Group 30 - Final Drive Group 35 - Continuous and Transmission PTO Group 40 - Independent PTO Group 45 - Belt Pulley

SECTION 60 - STEERI NG AND BRAKES Group 5 - General Information

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

Tests Group 10 - Miscellaneous Hydraulic Components Group 15 - Hydraulic Pumps Group 20 - Steering System Group 25 - Hydraulic Brakes Group 30 - Rockshaft System Group 35 - Selective Control Valve, Breakaway

Couplers, and Remote Cylinders

SECTION 80 - MISCELLANEOUS Group 5 - Front Axle

All information, illustrations and specifications con­tained in this technical 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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Tractor - 1520 TM-1012 (Jan-71)

General 10 Specifications 5-1

Section 10

GENERAL

CONTENTS OF THIS SECTION

Page

GROUP 5 - SPECIFICATIONS General Tractor Specifications ........... " 5-1

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

Predelivery Service ..................... 10-1

Page

Engine Lubricating Oils .................. 20-2 Transmission - Hydraulic Oil .............. 20-2 Multi-purpose Gear Lubricants ............ 20-2 Greases. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 20-2 Storing Lubricants ...................... 20-2

Delivery Service ....................... 10-4 GROUP 25 - SEPARATION After-Sale Inspection .................. , 10-4 Separating Engine from Clutch Hous-

ing ................................ 25-1 GROUP 15 - TUNE-UP Separating Clutch Housing from

Preliminary Engine Testing ............... 15-1 Transmission Case ................... 25-2 Engine Tune-Up ....................... 15-1 Separating Tractor Front End from Engine ... 25-3 Final Engine Test ...................... 15-3 Removing Engine ...................... 25-4 Tractor Tune-Up ...................... , 15-4 Removing Final Drive Assembly ........... 25-5

Specifications ......................... 25-6

GROUP 20 - LUBRICATION Torques for Hardware ................... 25-6

Lubrication Chart ...................... 20-1 Special Tools .......................... 25-6

Group 5

GENERAL TRACTOR SPECIFICATIONS Gasoline

ENGINE Maximum PTO horse-

power* ........... 47.S6 Number of cylinders .. " 3 Bore and stroke,

inches ........... " 4.02 x 4.33

Displacement in cubic inches ........ 164.0

Compression ratio. . . . .. S.O to 1 Firing order . . . . . . . . . .. 1-2-3 I ntake valve clearance .. 0.014-in. Exhaust valve clear-

ance .............. 0.022-in. Slow idle ............. 600 rpm Fast idle ............. 26S0 rpm

* Official test at 2500 engine rpm.

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Diesel

46.52 3

4.02x 4.33

164.0 16.3 to 1 1-2-3 0.014-in.

0.01S-in. SOO rpm 2650 rpm

ELECTRICAL SYSTEM Battery dry voltage . . . . . . . . . . . . . . . . .. 12 volts Battery specific gravity at full

charge (corrected to SOoF.) ........... 1.260 Battery terminal grounded ............ negative

CAPACITIES (U.S. Standard Measures) Fuel tank ....................... 19-112 gals. Cooling system ...................... 3 gals. Crankcase (including filter) ............. 6 qts. Transmission-hydraulic system ........ 10 gals. Belt pulley ........................ 2-112 pts.

CLUTCH .................. Single or dual stage, spring-loaded, dry

disk, foot-operated.

Tractor - 1520 TM-1012 (Apr-75)

Engine 20 General Information and Diagnosis 5-1

Section 20 ENGINE

CONTENTS OF THIS SECTION

GROUP 5 - GENERAL INFORMATION AND DIAGNOSIS

Page

General Information ........................ 5-2 Diagnosing Malfunctions .................... 5-2 Engine Break-In ............................ 5-7

GROUP 10 - CYLINDER HEAD AND CAMSHAFT General Information ...................... 10-1 Diagnosing Malfunctions .................. 10-1 Cylinder Head ........................... 10-2 Adjusting Valve Clearance . . . . . . . . . . . . . . .. 10-4 Camshaft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-5 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-6 Torques for Hardware . . . . . . . . . . . . . . . . . . .. 10-7 Special Tools ............................ 10-7

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

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

GROUP 20 - CRANKSHAFT, MAIN BEAR-INGS, AND FLYWHEEL

General Information ...................... 20-1 Diagnosing Malfunctions .................. 20-1 Inspecting Flywheel and Housing .......... 20-2 Inspecting Crankshaft ..................... 20-2 Checking Crankshaft End Play . . . . . . . . . . .. 20-1 Checking Main Bearing Clearance. . . . . . . .. 20-2 Rear Oil Seal and Wear Ring... . . . . . . . . .. 20-2 Assembly ................................ 20-3 Specifications ... . . . . . . . . . . . . . . . . . . . . . . . .. 20-4 Torques for Hardware .................... 20-4 Special Tools ............................ 20-4

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GROUP 25 - TIMING GEAR TRAIN Page

General Information ...................... 25-1 Checking Backlash . . . . . . . . . . . . . . . . . . . . . .. 25-1 Front Plate and Timing Gear Cover ....... 25-1 Front Crankshaft Oil Seal ................. 25-2 Timing Gear Train ........................ 25-2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .. 25-3 Torques for Hardware .................... 25-3 Special Tools ............................ 25-4

GROUP 30 - LUBRICATION SYSTEM General Information ...................... 30-1 Diagnosing Malfunctions .................. 30-1 Oil Pump ................................ 30-2 Oil Filter................................. 30-2 Pressure Regulating Valve ................ 30-3 Adjusting Engine Oil Pressure............. 30-1 Specifications .. . . . . . . . . . . . . . . . . . . . . . . . . .. 30-4 Torques for Hardware .................... 30-4 Special Tools ............................ 30-4

GROUP 35 - COOLING SYSTEM General Information ...................... 35-1 Diagnosing Malfunctions .................. 35-1 Radiator and Fan ........................ 35-1 Fan Belt Adjustment ...................... 35-1 Water Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 35-1 Water Manifold and Thermostat . . . . . . . . . .. 35-3 Specifications ..... . . . . . . . . . . . . . . . . . . . . . .. 35-4 Torques for Hardware .................... 35-4 Special Tools ............................ 35-4

GROUP 40 - GOVERNOR AND SPEED CONTROL LINKAGE

General Information ...................... 40-1 Governor ................................ 40-1 Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 40-1 Installation ............................... 40-2 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 40-3 Carburetor Adjustment. . . . . . . . . . . . . . . . . . .. 40-3 Injection Pump Adjustment ................ 40-3 Speed Control Linkage Repair ............ 40-4 Speed Control Linkage Adjustment ... . . . .. 40-5 Specifications ..... . . . . . . . . . . . . . . . . . . . . . .. 40-6

20 Engine 25-2 Timing Gear Train

Fig. 2-lnstalling Front Oil Seal

To install new front crankshaft oil seal in timing gear cover, coat outer surface of seal with joint seal­ing compound. Support the oil seal bore area of the timing gear cover. Use J0250 tool to install oil seal (Fig. 2). Seal should bottom in the bore and the spring-loaded lip of the seal should face inward.

ASSEMBLY AND INSTALLATION

NOTE: If engine has been completely disassem­bled, install crankshaft before installing front plate. Tighten cap screws to specified torque.

1. I nstall camshaft, fuel injection pump and drive gear (diesel) or governor (gasoline). Refer to Section 30 for the proper method of installing injection pump drive shaft and gear.

2. Install oil pump assembly, but do not tighten oil pump drive gear until other gears have been installed.

3. Turn engine until No.1 piston is on "TOG" of the compression stroke. Install timing pin. 00 not rotate crankshaft after "TOG" is established.

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Tractor - 1520 TM-1012 (Jan-71)

Fig. 3-Timing the Camshaft Gear

4. Use J0254 tool to align timing mark on the camshaft gear with the center of the crankshaft as shown in Figure 3.

Fig. 4-Timing the Injection Pump Gear

5. On diesel engines, use J0254 tool to align the timing mark on injection pump drive gear with center of crankshaft as shown in Figure 4.

NOTE: Use timing mark on drive gear which indi­cates number of cylinders in engine.

Engine 20 Tractor - 1520 TM-1012 (Jan-71) Timing Gear Train 25-3

Recheck timing using JD254 Tool.

Remove timing pin.

6. I nstall inner upper idler gear thrust washer and upper idler gear. Use care not to rotate the camshaft or injection pump gears. I nstall outer thrust washer. lock plate. plain washer and cap screw. Be sure that holes in thrust washers fit over idler gear shaft spring pin. Tighten cap screw to specified torque.

Position oil slinger over crankshaft with inside di­ameter against crankshaft gear.

7. Install inner lower idler gear thrust washer and lower idler gear. Use care not to rotate the oil pump drive gear. Install outer thrust washer. lock plate. plain washer and cap screw. Be sure that holes in thrust washer fit over idler gear spring pin. Tighten idler gear and oil pump drive gear cap screws to specified torque.

Apply a thin coat of high temperature grease to the inside lips of the front oil seal and install timing gear cover. Tighten cap screws to specified torque.

Reverse removal procedure.

SPECIFICATIONS

Item New Part Wear Tolerance

Backlash between gear teeth: Crankshaft to upper idler ........................... . 0.0027 to 0.0116 in. Upper idler to camshaft ........................... . 0.0028 to 0.0135 in. Upper idler to fuel injection pump ................... . 0.0028 to 0.0135 in. Upper idler to governor ............................ . 0.0023 to 0.0127 in. Crankshaft to lower idler ........................... . 0.0027 to 0.0137 in. Lower idler to oil pump ............................ . 0.0016 to 0.0147 in.

I.D. of idler gear bushing ............................ . 1.7515 to 1.7535 in. O.D. of idler gear shaft .............................. . 1.7495 to 1.7505 in. Oil clearance between bushing and idler shaft ............ . 0.001 to 0.004 in. 0.006 in. End play upper and lower idler gears (new parts) ......... . 0.001 to 0.007 in. 0.015 in.

TORQUES FOR HARDWARE

Location Torque (ft-Ibs)

Front plate to cylinder block screws ...................................................... 25 Oil pump drive gear nut (stake to shaft) .................................................... 45 Upper and lower idler gear cap screws .................................................... 95 Timing gear cover cap screws ........................................................... 35

No.

JD246* JD250* JD254* JD252*

SPECIAL TOOLS

Name Use

· ....... Bushing driver ................... I nstall governor shaft bushing in timing gear cover. · ....... Oil seal driver .................... I nstall front crankshaft oil seal in timing gear cover. · ....... Gear timing tool .................. To time engine front gear train. · ....... Bushing driver ................... I nstall idler gear bushings.

* Order from: Service Tools. Inc., 1901 Indiana Avenue, Chicago, Illinois 60616.

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Tractor - 1520 TM-1012 (Apr-75)

Fuel Systems 30 Diagnosing Malfunctions 5-1

Section 30

FUEL SYSTEMS CONTENTS OF THIS SECTION

Page

GROUP 5 - DIAGNOSING MALFUNC-TIONS ......................... 5-1

GROUP 10 - DIESEL FUEL SYSTEM Air Cleaner . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-1 Fuel Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-1 Fuel Pump .............................. 10-1 Fuel Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-1 Bleeding Fuel System .................... 10-1 Fuel Injection Pumps

Roosa Master Model C Pump .......... 10-1 Roosa Master Model CB Pump......... 10-3

Roosa Master Model JDB Pump .......... 10-4 Fuel Injection Nozzles .................... 10-8 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-9 Torques for Hardware ................... 10-10 Special Tools ........................... 10-10

General Information

The following is a guide for diagnosing fuel system malfunctions. For specific fuel system components, refer to the groups which cover complete servicing.

Fuel Not Reaching Injection Pump or Carburetor

Filters clogged. Fuel line clogged or restricted. Electrical shut-off does not work. Fuel too heavy at low temperatures (diesel).

Engine Starts Hard or Won't Start

Air leak on suction side of system. Fuel too heavy at low temperatures (diesel). Diesel injection nozzles faulty or sticking. Incorrect timing. Diesel automatic advance is faulty or not

operating. Water in fuel. Filters clogged. Injection pump return fuel line or fittings

restricted (diesel). Low octane or low cetane fuel. Injection pump 1800 out of time.

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Page

GROUP 15 GASOLINE FUEL SYSTEM

Air Cleaner ........................... 15-1 Gasoline Fuel Tank ..................... 15-1 Fuel Pump ............................ 15-1 Carburetor

General Information ... . . . . . . . . . . . . . .. 15-1 Diagnosis .......................... 15-2 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15-2

Specifications . . . . . . . . . . . . . . . . . . . . . . . .. 15-4 Special Tools .......................... 15-4

Group 5 DIAGNOSING MALFUNCTIONS

Engine Starts and Stops

Electrical shut-off does not work. Air leak on suction side of system. Filters clogged. Fuel lines clogged or restricted. Water in fuel. Injection pump return fuel line or fittings

restricted (diesel).

Erratic Engine Operation

Filters clogged. One or more connector screws obstructed

(diesel). Air leak on suction side of system. Fuel too heavy at low temperatures (diesel). I njection nozzles faulty or sticking (diesel). Fuel lines clogged or restricted. Incorrect timing. Diesel automatic advance faulty or not op­

erating. Water in fuel. I njection pump return fuel line or fittings

restricted (diesel). Low octane or low cetane fuel. Injection nozzle return lines clogged (diesel).

Tractor - 1520 TM-1012 (Apr-75)

Electrical System 40 Information and Diagrams 5-1

Section 40

ELECTRICAL SYSTEM CONTENTS OF THIS SECTION

Page

GROUP 5 - INFORMATION AND DIAGRAMS General Information ..................... 5-2 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 Circuit Breaker ......................... 5-2 Key Switch ............................ 5-2

Wiring Diagrams ........................ 5-2 Electrical Remote Control ................ 5-11 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 5-13

GROUP 10 - CHARGING CIRCUIT General Information ..... . . . . . . . . . . . . . .. 10-1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-1 Diagnosis and Tests .................... 10-1 Battery Tests . . . . . . . . . . . . . . . . . . . . . . . . .. 1 0-1 Wiring Tests .......................... 10-2 Testing with Voltmeter .................. 10-2 Testing Alternator Field Circuit on

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

Voltmeter .......................... 10-3 Testing Alternator with Regulator on

Tractor ............................ 10-3 Testing Regulator ....... . . . . . . . . . . . . . .. 10-3 Repair ............................... 10-3 Slip Ring Bearing ...................... 10-4 Drive End Bearing. . . . . . . . . . . . . . . . . . . . .. 10-4 Rotor ................................ 10-5 Brushes .............................. 10-5 Diodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1 0-5 Stator ............................... 10-6 Assem bly ............................ 1 0-6 Tests After Assembly ................... 10-6 Installation ........................... 10-7 Specifications . . . . . . . . . . . . . . . . . . . . . . . .. 10-7 Torques .............................. 10-8 Special Tools. . . . . . . . . . . . . . . . . . . . . . . . .. 10-8

GROUP 15 - STARTING CIRCUIT General Information .. . . . . . . . . . . . . . . . . .. 15-1 Diagnosis and Tests .................... 15-1 High Resistance Tests .................. 15-1 Solenoid Tests. . . . . . . . . . . . . . . . . . . . . . . .. 15-1 Starter No Load Test . . . . . . . . . . . . . . . . . . .. 15-2 Start-Safety Switch Adjustment .. . . . . . . . .. 15-2 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15-2

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Page

GROUP 15 - STARTING CIRCUIT (Continued) Solenoid Switch ....................... 15-3 Overrunning Clutch Drive . . . . . . . . . . . . . . .. 15-3 Bushings ............................. 15-3 Armature. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15-3 Field Coils . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15-3 Brushes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15-3 Assembly ............................ 15-4 Pinion Clearance. . . . . . . . . . . . . . . . . . . . . .. 15-4 Installation ........................... 15-4 Specifications . . . . . . . . . . . . . . . . . . . . . . . .. 15-5 Torques .............................. 15-6 Special Tools .......................... 15-6

GROUP 20 - IGNITION CIRCUIT General Information . . . . . . . . . . . . . . . . . . . . 20-1 Resistance Wire ....................... 20-1 Coil ................................. 20-1 Spark Plug ............................ 20-1 Diagnosis and Tests .................... 20-1 Testing for High Resistance .............. 20-1 Testing Distributor Off Tractor ............ 20-2 Repair ............................... 20-2 Bushing Replacement ................... 20-2 Gear Replacement . . . . . . . . . . . . . . . . . . . .. 20-3 Contact Points ......................... 20-3 Tests After Assembling .................. 20-3 Installation ........................... 20-4 Timing Distributor ...................... 20-4 Emergency Timing ..................... 20-4 Specifications ......................... 20-4 Torques .............................. 20-5 Tune-Up Data ......................... 20-5 Special Tools .......................... 20-5

GROUP 25 - LIGHTING AND ACCESSORY CIRCUITS Lights ............................... 25-1 Diagnosis and Tests .................... 25-1 Light Adjustment ....................... 25-1 Accessories and Instruments ............. 25-1 Fuel Gauge ........................... 25-1 Carburetor and Injection Pump Solenoid .... 25-2 Specifications .. . . . . . . . . . . . . . . . . . . . . . .. 25-2

Tractor - 1520 TM-1012 (Apr-75)

Power Train 50 Clutches 5·1

Section 50

POWER TRAIN CONTENTS OF THIS SECTION

Page Page

GROUP 5 - CLUTCHES GROUP 25 - DIFFERENTIAL Single Stage Clutch. . . . . . . . . . . . . . . . . . . . .. 5-2

General Information . . . . . . . . . . . . . . . . . .. 5-2 Diagnosing Malfunctions ................ 5-3 Repair .............................. 5-4 Assembly ........................... 5-5 I nstaliation .......................... 5-6 Adjustment . . . . . . . . . . . . . . . . . . . . . . . . .. 5-6

Dual Stage Clutch ....................... 5-7 General Information .............. . . . . . 5-7 Repair .............................. 5-8 Assembly ........................... 5-10 I nstaliation .......................... 5-10 Adjustment .......................... 5-11

Clutch Housing and Controls ............. 5-12 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-12

Specifications . . . . . . . . . . . . . . . . . . . . . . . .. 5-14 Special Tools .......................... 5-15

GROUP 10 - HI-LO SHIFT UNIT General Information ......... . . . . . . . . . .. 10-1 Testing and Diagnosis ................... 10-3 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-5 Assembly ............................ 10-9 Specifications . . . . . . . . . . . . . . . . . . . . . . .. 10-10 Special Tools. . . . . . . . . . . . . . . . . . . . . . . .. 10-10

GROUP 15 - REVERSER General Information ..... . . . . . . . . . . . . . .. 15-1 Testing .............................. 15-7 Diagnosing Malfunctions ................ 15-9 Removal ............................ 15-10 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15-11 Adj ustments ...... . . . . . . . . . . . . . . . . . .. 15-15 Specifications . . . . . . . . . . . . . . . . . . . . . . .. 15-16 Special Tools. . . . . . . . . . . . . . . . . . . . . . . .. 15-16

GROUP 20 - COLLARSHIFTTRANSMISSION General Information .. . . . . . . . . . . . . . . . . .. 20-1 Diagnosing Malfunctions ................ 20-1 Removal ............................. 20-2 Repair ............................... 20-4 I nstaliation ........................... 20-5 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 20-8

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General Information ................... , 25-1 Diagnosing Malfunctions ................ 25-1 Removal ............................. 25-1 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-2 Adjustment ........................... 25-2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 25-2

GROUP 30 - FINAL DRIVE General Information ..... . . . . . . . . . . . . . . . 30-1 Diagnosing Malfunctions ................ 30-1 Removal ............................. 30-1 Repair ............................... 30-2 Assembly ............................ 30-2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 30-2

GROUP 35 - CONTINUOUS RUNNING AND TRANSMISSION-DRIVEN PTO

General Information . . . . . . . . . . . . . . . . . . . . 35-1 Diagnosing Malfunctions ................ 35-2 Removal ............................. 35-3 Repair ............................... 35-6 Assembly ............................ 35-6 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 35-6

GROUP 40 - INDEPENDENT PTO General Information . . . . . . . . . . . . . . . . . . . . 40-1 Testing .............................. 40-3 Diagnosing Malfunctions ................ 40-3 Repair ............................... 40-4 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 40-6

GROUP 45 - BELT PULLEY General Information .................... 45-1 Repair ............................. : . 45-1 Assembly and Adjustment ............... 45-2 Specifications . . . . . . . . . . . . . . . . . . . . . . . .. 45-2

50 Power Train 5-10 Clutches

Assembly

Position transmission clutch disk in flywheel, long hub down. Insert the three operating bolts in clutch plate and install clutch plate in flywheel. Be sure that operating bolt heads are properly seated in the re­cesses in the clutch plate.

Install clutch springs and PTO clutch plate. Be sure that all springs are properly seated in their re­spective retainers. The six inner springs are installed in the retainers where there are two retainer holes close together (1200 apart).

Position PTO clutch disk with long hub upward. Position clutch cover assembly on flywheel. Be sure that clutch operating bolts are properly aligned with holes in cover.

,> .. 0

R 237611"<1"

A-Clutch Operating Bolt B-PTO Clutch Release Pin C-Jack Screw

D-PTO Clutch Hub (Long Hub Up)

E-Clutch Cover

Fig. 11-lnstalling Clutch Cover

Insert JOE-52-1 Centering Tool into clutch assem­bly to align PTO clutch disk and transmission clutch disk with flywheel pilot bearing (Fig. 11).

With JOE-52-1 Centering Tool in clutch assembly, install jack screws in equally spaced holes (Fig. 11), and tighten jack screw nuts evenly to compress clutch springs.

Insert PTO clutch release pins in clutch cover. In­stall operating levers with springs. Install jam nuts on operating bolts and screw them down.

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Tractor - 1520 TM-1012 (Apr-75)

Loosen the jam nuts on the clutch operating bolts until each lever just contacts its PTO clutch release pin.

Tighten each operating bolt nut exactly 2-112 turns and lock the jam nut.

Remove the jack screws and carefully withdraw the clutch pack assembly and transmission clutch disk from the flywheel.

Installation

A-Clutch Assembly B-Flywheel

C-Transmission Clutch Disk (Long Hub to front)

Fig. 12-lnstalling Clutch Assembly

Install flywheel (B, Fig. 12) on crankshaft and tight­en cap screws to 85 ft-Ibs.

Position clutch pack assembly (A, Fig. 12) and transmission clutch disk (C) (long hub to front) on end of JOE-52 Centering Tool to maintain clutch disk alignment. Insert end of centering tool in flywheel pi­lot bearing and slide clutch pack assembly in place. Tighten attaching cap screw to 35 ft-Ibs.

Check that the throw-out bearing contact areas of the operating levers are the same height (within 0.020 inch). If necessary, make minor adjustments of the two farthest apart levers to bring them all into the same plane.

Join engine to clutch housing as instructed in Sec­tion 10, Group 25.

Tractor - 1520 TM-1012 (Apr-75)

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

Section 70 HYDRAULIC SYSTEM

CONTENTS OF THIS SECTION

Page

GROUP 5 - GENERAL INFORMATION, DIAGNOSIS AND TESTING

General Information ........................ 5-3 System Testing ............................ 5-3 Time Cycle Checks ........................ 5-3

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

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

GROUP 10 - MISCELLANEOUS HYDRAULIC COMPONENTS

Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-1 Oil Filter Relief Valve. . . . . . . . . . . . . . . . . . . .. 10-1 Surge Relief Valve . . . . . . . . . . . . . . . . . . . . . .. 10-1 Inlet Line Check Valve ................... 10-2 Pressure Control Valve ................... 10-2 Auxiliary Reservoir ....................... 10-3 Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1 0-4 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .. 10-4

GROUP 15 - HYDRAULIC PUMPS Transmission Pumps

General Information .................. " 15-1 Repair ................................ 15-1

Main Hydraulic Pump General Information and Diagnosis .... " 15-2 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15-3 Removal and Repair . . . . . . . . . . . . . . . . . .. 15-5 Inspection ........................... " 15-5 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15-6 Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . .. 15-6

Specifications .......................... " 15-7

GROUP 20 - STEERING SYSTEM General Information and Operation ........ 20-1 Diagnosis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 20-3

Litho in U.S.A.

Page

Steering Valve Removal and Repair ....... 20-5 Steering Valve Adjustment .............. 20-7 Manual Steering ....................... 20-8 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . 20-11

GROUP 25 - HYDRAULIC BRAKES General Information and Operation ........ 25-1 Brake Valve Removal and Repair ......... 25-2 Brake Valve Inspection and Assembly ..... 25-3 Pressure Plate, Facing, and Disks ......... 25-4 Brake Pedal Adjustment . . . . . . . . . . . . . . . . .. 25-4 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .. 25-6

GROUP 30 - ROCKSHAFT SYSTEM General Information ...................... 30-1 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 30-1 Diagnosis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 30-3 Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 30-5 Assembly ................................ 30-7 Installation ............................... 30-8 Load Control Mechanism ................. 30-8 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 30-10 3-Point Hitch and Quik-Coupler .......... 30-13 Specifications .. . . . . . . . . . . . . . . . . . . . . . . . .. 30-15

GROUP 35 - SELECTIVE CONTROL VALVE, BREAKAWAY COUPLER AND REMOTE CYLINDER

General Information ...................... 35-1 Selective Control Valve ................... 35-2

Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 35-2 Diagnosing Malfunctions ................ 35-4 Removal .............................. 35-5 Inspection and Repair . . . . . . . . . . . . . . . . .. 35-6 Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 35-8 Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . .. 35-9

Breakaway Coupler. . . . . . . . . . . . . . . . . . . . . . 35-10 Remote Cylinder . . . . . . . . . . . . . . . . . . . . . . .. 35-12 Specifications .. . . . . . . . . . . . . . . . . . . . . . . . .. 35-13

Tractor - 1520 TM-1012 (Jan-71)

Miscellaneous 80 Front Axle 5-1

Section 80

MISCELLANEOUS

CONTENTS OF THIS SECTION

Page

GROUP 5 - FRONT AXLE General Information . . . . . . . . . . . . . . . . . . . . . 5-1 Removal .............................. 5-1 Repair ................................ 5-2 Installation ............................ 5-3 Specifications .......................... 5-4 Torques for Hardware .................... 5-4 Special Tools ........................... 5-4

GENERAL INFORMATION

The front axle assembly consists of the front axle, knee assembly, spindle and knuckle assembly, steer­ing arms,' steering bellcrank, and tie rods. The com­plete assembly pivots on the front and rear pivot pins, which are fastened to the front end support.

Remove the front axle assembly if new pivot pins or bushings are to be installed.

REMOVAL

Fig. 1-Removal Procedure

Litho in U.S.A.

Group 5 FRONT AXLE

Remove the cotter pin and slotted nut (Fig. 1) from the axle mounting bolt.

Disconnect the drag link from the steering bell­crank.

Place a metal stand or floor jack under the axle assembly to support the axle during removal.

Fig. 2-Removing Front Axle Assembly

Install a JDG-3 lift bracket (Fig. 2), and raise the front end of tractor just enough to remove the weight from the axle assembly.