John Deere MODEL: 8430 & 8630 Volume 1 of 2 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-TM1143
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John Deere 8430 | 8630 Tractor Service Manual · component has to be removed and the best method ... Work liners in place by hand and seat with wood ... John Deere 8430 | 8630 Tractor
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John Deere
MODEL:
8430 & 8630 Volume 1 of 2
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.
SECTION 10-GENERAL Group 5 - General Tractor Specifications Group 10 - Predelivery, Delivery and After-Sale
Services Group 15 - Tune-Up Group 20 - Lubrication Group 25 - Separation Group 30 - Specifications and Special Tools
SECTION 20-8430 ENGINE Group 5 - General Information, Diagnosis and
Tests Group 10 - Cylinder Head, Valves and Camshaft Group 15 - Cylinder Block, Liners, Pistons and
Rods Group 20 - Crankshaft, Main Bearings and Fly-
wheel Group 25 - Lubrication System Group 30 - Cooling System Group 35 - Specifications and Special Tools
SECTION 25-8630 ENGINE Group 5 - General Information, Diagnosis and
Tests Group 10 - Cylinder Head, Valves and Camshaft Group 15 - Cylinder Block, Liners, Pistons and
Rods Group 20 - Crankshaft, Main Bearings and Fly-
wheel Group 25 - Lubrication System Group 30 - Cooling System Group 35 - Specifications and Special Tools
SECTION 30-FUEL SYSTEM Group 5 - Diagnosing Malfunctions Group 10 - Air Intake System Group 15 - Diesel Fuel System Group 20 - Speed Control Linkage Group 25 - Specifications and Special Tools
SECTION 40-ELECTRICAL SYSTEM Group 5 - Information and Diagrams Group 10 - Electrical Diagnosis Group 15 - Delcotron Charging Circuit Group 20 - John Deere Charging Circuit Group 25 - Delco-Remy Starting Circuit Group 30 - John Deere Starting Circuit
Group 35 - Lighting Circuits Group 40 - Instrument and Accessory Circuits Group 45 - Remote Electrical Circuits Group 50 - Specifications and Special Tools
SECTION 50-POWER TRAIN Group 5 - Perma-Clutch@> Group 10 - Quad-Range Planetary Group 15 - Independent PTO Group 20 - Torque Divider Group 25 - Quad-Range® Transmission Group 30 - Differentials and Drive Shafts Group 35 - Final Drives Group 40 - Specifications and Special Tools
SECTION 60-STEERING AND BRAKES Group 5 - General Information
SECTION 70-HYDRAULIC SYSTEM Group 5 - General Information Group 6 - Hydraulic System Testing and Diag-
nosis Group 10 - Miscellaneous Hydraulic Components Group 15 - Hydraulic Pumps Group 20 - Power Steering Group 25 - Power Brakes Group 30 - Rockshaft and Implement Hitches Group 35 - Selective Control Valves, Breakaway
Couplers and Remote Cylinders Group 40 - Specifications and Special Tools
SECTION 80-S0UND-GARD BODY® Group 5 - Separation Group 10 - Air Conditioning System Group 15 - Heating System Group 20 - Seat Group 25 - Miscellaneous Components Group 30 - Specifications and Special Tools
SECTION gO-MISCELLANEOUS Group 5 - Wheels Group 10 - Specifications
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.
Separation of the tractor may be subdivided into the following components (Fig. 1): Front drive (A), engine (B), front end, clutch housing (C}, front hinge, hinge pin, rear hinge, torque divider (E), transmission (F), final drive (G) and Sound-Gard body (H). Basic separation of these components will be explained within this group, except for the Sound-Gard body covered in Section 80, and final drive covered in Section 50.
A CAUTION: Always use the hinge lock .. bars, provided with the tractor, whenever
front or rear of tractor is raised. See operator's manual for installation of lock bars.
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It is important to determine beforehand, which component has to be removed and the best method to use in removing the component, in order to perform the required service in the shortest possible time. For example, it is possible to gain access to the engine clutch two different ways: (1) Removing engine and tractor front end from clutch housing, (2) Removing tractor front end, then removing engine from clutch housing. The method selected will be determined by the total service requirements for any particular job, and on personal choice.
Once a basic component has been removed from the tractor, refer to the appropriate section of this manual for detailed service information.
Check each piston cooling orifice (Fig. 12) for plugged or damaged condition. An orifice failure could cause damage to pistons, piston pins, rod pin bushings, and liners. Replace orifices as necessary. Tighten to 85 to 110 in-Ibs (9.60 to 12.43 Nm).
ASSEMBLY AND INSTALLATION Liners
Fig. 13-lnstalling Cylinder Liner
Be sure liner bore in cylinder block is clean. First, install liner without O-rings and secure with cap screws and washers. Check liner height in several places.
If installation is in new cylinder block, the height of the liner should be 0.001-0.004 inches (0.025-0.102 mm).
If installation is in used cylinder block, the height of the liner should be 0.000-0.004 inches (0.000-0.102 mm).
NOTE: Install liner with the "L-L" or "H-H" mark toward the front of the engine.
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Cylinder Block, Liners, Pistons, and Rods 15-7
Install O-rings in grooves in bore and packing on cylinder liner. Apply AR54749 Lubricating Soap to 0-rings and packing.
Work liners in place by hand and seat with wood block and hammer (Fig. 13).
NOTE: Cylinder liner will protrude above the cylinder block more than normal due to uncompressed packing.
Piston and Rod Assembly
Be sure identification marks on piston and rod are in the same position as they were at time of disassembly.
Use a JOE-94 Ring Expander to install rings in their respective grooves.
NOTE: New rings are furnished with the correct end gap; therefore, filting to the liner is not necessary.
Install expander in oil ring groove. Install the oil ring on the piston with the expander to the top of the piston. Position oil ring gap opposite expander gap.
Coat pistons, liners, and JOE-97 ring compressor (Fig. 12) with engine oil.
Fig. 14-lnsta/ling Piston
Stagger ring gaps on piston and carefully slide ring compressor over piston. Carefully place ring compressor, with piston and rod, over liner. With piston and rings centered, push piston into liner.
NOTE: Be sure the words "front" on head of piston and rod face front of engine.
Apply engine oil to bearing inserts and crankshaft rod of journals. Small tangs on each half of the inserts must fit in recesses in rod and cap.
The following is a guide for diagnosing fuel system malfunctions. For specific diagnosis of fuel system components. refer to the groups which cover complete servicing.
Fuel Not Reaching Injection Nozzles
Filters clogged. Fuel line clogged or restricted. Fuel too heavy at low temperatures. Air in system. Low supply pump pressure.
Engine Starts Hard or Won't Start Air leak on suction side of system. Fuel too heavy at low temperatures. Injection nozzles faulty or sticking. Incorrect timing Governor is faulty or not operating. Water in fuel. Filters clogged. Injection pump return fuel line or' fittings restricted. Low cetane fuel. Starting fuel control linkage or aneroid activator not
working properly.
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Engine Starts and Stops Air in system. Filters clogged. Fuel lines clogged or restricted. Water in fuel. Injection pump return fuel line or fittings
restricted.
Erratic Engine Operation
Filters clogged. Air leak on suction side of system. Fuel too heavy at low temperatures. Injection nozzles faulty or sticking. Fuel lines clogged or restricted. Incorrect timing. Governor faulty or not operating. Water in fuel. Injection pump return fuel line or fittings restricted. Low cetane fuel. Injection nozzle return lines clogged.
GROUP 20 - TORQUE DIVIDER General Information ...................... 20-1 Diagnosing Malfunctions .................. 20-2 Repair .................................. 20-2 Inspection and Assembly. . . . . . . . . . . . . . . . .. 20-3
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Page GROUP 25 - QUAD-RANGE TRANSMISSION
General Information ...................... 25-1 Diagnosing Malfunctions .................. 25-3 Removal ................................ 25-3 Repair .................................. 25-5 Assembly ................................ 25-7 Range And Speed Selector Lever Assembly
Rod and Bell Crank Design Removal and Repair .................. 25-18 Assembly and Adjustment. . . . . . . . . . . . .. 25-20
Check clutch oil pump output as instructed in Section 70, Group 15. This measures the oil which is delivered to the oil cooler and then returned for lubrication. Refer to Fig. 2 for lubrication flow schematic.
Oil Pressure Switch Test
A-D-01019AA Hand Pump 8-0-300 psi (0-25 bar)
Pressure Gauge
C-Ohmmeter D-Oil Pressure Switch
Fig. 13·.Testing Pressure Switch
Remove the oil p~essure switch (Fig. 8). Connect the switch to a hydraulic hand pump. Connect a 12-volt test lamp and battery across the switch leads.
The switch should open as the pressure is raised to 145 to 155 psi (999 to 1068 kPa) and close when the pressure is reduced to 115 to 125 psi (792 to 861 kPa).
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Tractors - 8430 and 8630 TM-1143 (Feb-79)
OPERATING PISTON HOUSING AND
CLUTCH VALVE HOUSING
Removal
Disconnect and remove the upper telescoping UjOint from the clutch output yoke while the tractor is in a straight position. After the U-joint is removed, then put the tractor in a sharp right turn.
Separate engine from clutch housing. Refer to Section 10, Group 25, for procedures.
A. CAUTION: Use necessary safety precau.. tions when performing separation. Use
support under sections when necessary.
A-Oil Lines B-PTO Rod
C-Clutch Rod D-Operatlng Arms
Fig. 14-Pressure Regulating Valve Housing (Late Model Shown)
Remove oil lines (A, Fig. 14) and operating rods (B) from pressure regulating valve housing. On some tractors the operating rods are secured to the operating arms by spring pins. Remove these spring pins to disconnect rods from arms. On other tractors the rods are secured to the operating arms by retaining rings (Fig. 15). The rods cannot be disconnected until the operating arms are removed from the operating arm shafts. Remove spring pin securing arms to shaft and remove arms.
Later tractors (Fig. 14) are headed pins and retainer pins to connect the operating rods to their arms.
GROUP 5 - WHEELS General Information ........................ 5-1 Removal .................................. 5-1 Repair .............. , ..................... 5-1 Installation ................................. 5-2
GENERAL INFORMATION
Both the 8430 and 8630 tractor main drive wheels are of the cast disk type mounted on Rack and Pinion axles. When double wheels are used (either front or rear), the outer wheel may be a cast or steel disk type.
Fig. 1-Removing Snap Ring
To remove or change position of a rear wheel, follow the instructions given in the Operator's Manual. Use JOG-18 Snap Ring Tool to remove snap ring from axle. (See Fig. 1.)
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Page GROUP 10 - SPECiFiCATIONS ............. 10-1
Removal
Group 5 WHEELS
1. (Not Illustrated). Clean the axle with a steel brush.
2. (Not Illustrated). Position the tractor so that the rack on the axle is up.
3. (Not Illustrated). Jack up the tractor.
'R 2671.3NL .'.
Fig. 2-Removing Wheel
4. Use JOG-18 Snap Ring Tool to remove axle snap ring (Fig. 1).
5. Loosen the three special bolts approximately 3/8 in. (10 mm).