2002 John Deere 110 Tractor Loader Backhoe Service & Repair Manual (P/N TM1987)

John Deere Technical Manual TM1987, June 2002 North American edition, covers the 110 Tractor Loader Backhoe with the Yanmar 4TNE84-EJTLB diesel engine. It combines system operation, diagnostic tests, adjustment specifications, and component repair procedures.

• Diesel engine: Engine removal, cylinder-head and valve repair, piston and crankshaft inspection, fuel-injection testing, and cooling-system service.

• HST controls: Potentiometer and speed-sensor testing, proportional-solenoid checks, manual calibration, and automatic control-system calibration.

• Drivetrain and MFWD: Front and rear tractor splitting, transmission removal, differential backlash adjustment, pinion-depth setup, and PTO clutch service.

• Hydraulic systems: Pump flow and relief-pressure tests, control-valve repair, cylinder leakage checks, rockshaft adjustments, and hydraulic-system bleeding.

• Electrical diagnosis: Wiring diagrams, Main Electrical Schematic, Auxiliary Hydraulics Circuit Schematic, and circuit tests for starting, charging, interlocks, and hydraulic controls.

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

• Loader and backhoe: Loader-frame and boom work, QUIK-TATCH service, bucket-link repairs, dipperstick removal, and swing-frame replacement procedures.

Written for experienced technicians, this manual uses workshop test equipment and component-level procedures for diagnosis, adjustment, and repair.

Diesel Engine Inspection and Fuel-System Testing

Internal engine coverage includes cylinder-head inspections, piston-to-bore measurements, crankshaft bearing clearances, and timing-gear checks. Repair sections address the rocker assembly, valves, pistons, connecting rods, crankshaft, camshaft, and oil pump.

Fuel-system procedures cover transfer-pump pressure, injection-nozzle testing and repair, injection-pump static timing, and bleeding. Thermostat testing, water-pump disassembly, and radiator/oil-cooler removal support cooling-system work.

General metric and inch fastener tables accompany component-specific torque requirements for main bearings, connecting rods, and flywheel mountings.

HST Fault Tracing, Calibration, and Drivetrain Repair

The HST System Troubleshooting Flowchart and HST Control System Service Code Chart connect operating symptoms and status-light codes with test points and corrective actions. This helps distinguish control-input faults from hydraulic drive problems before major assemblies are replaced.

Procedures using the JDG1575 Electronic Control Test Kit cover potentiometer voltage, speed-sensor frequency, and proportional-solenoid current. Connector-disconnection notes explain when manual recalibration becomes necessary; automatic calibration resets controller values and must be completed before the tractor can be driven.

HST repair scope: The manual covers unit removal, front-seal replacement, charge-relief-valve service, and proportional-solenoid work. Internal rotating components are not serviceable; a worn or damaged hydrostatic assembly is replaced as a complete unit.

MFWD sections explain bearing preload, shim selection, and pinion-depth setup using the JDG1395 Differential Setup Tool Kit. Final-drive instructions distinguish trial assembly with a used hub nut from final assembly with a new torque-prevailing nut.

Hydraulic Pumps, Valves, and Implement Circuits

Separate flow and relief-pressure tests address steering, auxiliary, and main implement circuits. Troubleshooting also covers slow functions, overheating, function drift, cylinder leakage, and stabilizer lockout leakage.

The Main Hydraulic Schematic and Steering System Schematic show circuit relationships alongside pump, valve, and component-location information. Repair procedures extend to loader and backhoe valves, optional loader diverter valves, PTO clutch valves, hydraulic cylinders, and rockshaft components.

The main implement pump section warns that disturbing its mounting plate without the specified realignment can cause premature pump failure. Cylinder-repair cautions identify clamping positions that can distort or damage the barrel.

Steering, Brakes, and Structural Components

Steering service boundary: Diagnostic tests and removal procedures are included, but the steering control unit and steering cylinder are replaced as complete units rather than internally repaired.

Brake sections cover disassembly, inspection, assembly, and linkage adjustment. Loader and backhoe procedures add lifting and support information for major components, including the boom, dipperstick, and swing frame.

Working on heavy machinery involves high-pressure hydraulics and heavy components. Follow the manual’s lifting, support, and pressure-relief precautions before opening hydraulic systems or removing major assemblies.

Oil-Pressure and Valve-Clearance Examples

For a warmed engine at 2600 rpm, the engine oil-pressure specification is 290–390 kPa (42–57 psi). The related test connects pressure findings with oil-pump inspection and possible internal engine wear.

The valve-clearance check and adjustment section specifies 0.15–0.25 mm (0.006–0.010 in.), with inspection guidance when clearance cannot be brought within specification.

Searchable Text, Bookmarks, and PDF Contents

Section navigation and schematic detail: The main text is searchable, with embedded bookmarks for chapters and individual procedures. The cover text is not searchable. Small wiring codes and terminal labels on detailed schematics require zooming for comfortable reading.

One printable, English-language 540-page PDF, including one cover page, one introduction page, and 13 otherwise blank pages carrying headers or page numbers.