2002 John Deere 110 Tractor Loader Backhoe Technical Manual (P/N TM1987)

The John Deere TM1987 technical manual, June 2002 North American edition, covers the 2002 110 Tractor Loader Backhoe with the Yanmar 4TNE84-EJTLB diesel. It brings together system operation, diagnostics, tests, adjustments, and repair procedures.

• Engine repair: Engine removal, cylinder-head and valve repair, piston and connecting-rod inspection, and crankshaft and main-bearing work.

• HST diagnostics: Service-code charts, pedal and throttle potentiometer tests, speed-sensor checks, and manual and automatic control-system calibration.

• Power train and MFWD: Tractor splitting, range-transmission repair, differential setup, final-drive inspection, and PTO clutch and brake service.

• Hydraulic systems: Pump-flow testing, relief-pressure checks, function-drift diagnosis, cylinder-leakage tests, and loader, backhoe, and rockshaft valve repair.

• Electrical troubleshooting: Starting, charging, interlock, lighting, and auxiliary-hydraulics diagnosis, supported by wiring schematics, connector identification, and harness color codes.

• Steering and brakes: Steering leakage and pressure tests, toe-in adjustment, brake inspection, and service-brake and parking-brake linkage adjustments.

• Loader and backhoe: Loader-frame and QUIK-TATCH service, bucket-linkage repair, and dipperstick, boom, and swing-frame removal and installation.

John Deere wrote this manual for experienced technicians working with the specified service tools and test equipment.

Diesel Engine, Fuel, and Cooling Repairs

Internal engine coverage includes cylinder-bore measurements, camshaft and timing-gear work, balancer assembly repair, and oil-pump inspection. The specifications distinguish standard dimensions, clearances, and wear limits for the valve train, pistons, and crankshaft journals.

Fuel-system procedures cover injection-pump removal, static timing, nozzle testing and repair, and fuel bleeding. Cooling-system work includes thermostat testing, water-pump disassembly, radiator removal, and pressure checks.

Connecting-rod caps are matched and directional; the manual warns that incorrect installation can damage the crankshaft and rods. Fast-idle and torque-capsule adjustments are reserved for authorized diesel service facilities.

HST Calibration and Drivetrain Repair Limits

The HST troubleshooting flowchart separates controller, external-switch, and hydraulic-system checks. Combined with the flash-code charts and component tests, it helps narrow down a drive complaint before transmission removal is considered.

The JDG1575 Electronic Control Test Kit is described for testing potentiometers, speed sensors, and proportional-solenoid circuits. Automatic calibration addresses pedal, throttle, and inching-lever inputs along with proportional-solenoid thresholds.

Entering calibration mode resets the controller values. The calibration routine must then be completed before the tractor can be driven.

HST repair scope: Internal HST components are designated nonserviceable. The documented work includes transmission removal, front-seal replacement, charge-relief-valve replacement, and proportional-solenoid service. Separate drivetrain sections cover MFWD pinion-depth setup, differential backlash adjustment, and PTO clutch/brake repairs.

Electrical Schematics and Harness Diagnosis

The Main Electrical Schematic, Lights Electrical Schematic, and Auxiliary Hydraulics Electrical Schematic accompany connector references and harness color-code lists. Circuit diagnosis covers cranking, cold starting, charging, safety interlocks, and backhoe-diverter controls.

Early- and late-model HST status-light arrangements are identified in the electrical documentation, so their wiring differences can be checked against the machine being serviced.

Hydraulic Testing and Implement Repairs

The Steering/Charge Pump and Hydrostatic Transmission Circuit Schematic and Main Hydraulic Schematic show the relationships between steering, auxiliary, implement, and drive circuits. JIC Hydraulic Circuit Symbols support interpretation of the hydraulic drawings.

Separate flow tests address the steering, auxiliary, and main implement pumps. Function-drift and stabilizer-lockout leakage tests provide more focused diagnosis than a general system-pressure check. Repair sections distinguish optional loader-diverter equipment and auxiliary backhoe controls.

The main implement pump section specifies JDG1635 alignment tooling when the mounting plate has been loosened or removed. Incorrect alignment can cause premature pump failure.

Loader and backhoe service requires the manual’s specified component supports, lifting equipment, and hydraulic pressure-relief precautions.

Examples of Engine Inspection and Assembly Data

The Yanmar engine’s intake and exhaust valve clearance is 0.15–0.25 mm, checked cold. The cylinder-compression test lists a standard range of 3135–3330 kPa (455–485 psi), with a minimum cranking speed of 250 rpm.

For assembly, the main-bearing bolt specification is 96–100 N·m (71–74 lb-ft) with lubricating oil applied. These examples accompany the component inspection criteria and assembly information in the engine section.

Searchable Text, Bookmarks, and PDF Contents

Text search and diagram detail: Text search is available across the main text sections, and embedded bookmarks provide access to system and procedure headings. The main Index bookmark opens partway through the index. Dense wiring and connector labels are best read with zoom.

The download contains one printable English-language PDF with 540 pages, including the cover, introduction, index, and 15 otherwise blank pages containing only headers or footers.