1976–1987 John Deere JD540-B Skidder & Grapple Skidder Technical Repair Manual (P/N TM-1139)

John Deere TM-1139 covers repair of the 1976–1987 JD540-B Skidder and Grapple Skidder. This October 1987 revision includes component repair procedures, inspection criteria, adjustment specifications, torque tables and special-tool references.

• Engine repair: Covers crankshaft, camshaft, pistons, cylinder liners and cylinder-head work, plus cooling-system service and injection-pump removal, timing and installation.
• Power Shift and axles: Includes clutch-pack assembly, transmission gears and bearings, planetary reductions, differential-lock service, bearing preload and gear-backlash adjustment.
• Hydraulic systems: Details main-pump overhaul, stroke-control valves, hydraulic manifolds, articulated steering valves and cylinders, with separate procedures for different component versions.
• Brakes and accumulators: Covers service and parking-brake components, brake-valve repair, the piston-type brake accumulator and the bladder-type emergency-steering accumulator.
• Electrical equipment: Includes battery checks, starter bench testing, alternator component tests, circuit breakers, neutral-start switch adjustment and fire-suppression wiring.
• Forestry attachments: Covers winch clutches and brake bands, blade hydraulics, adjustable log arches, grapple mechanisms, boom components and grapple rotation equipment.

Written for experienced service technicians, this manual suits forestry-equipment workshops and owners with the tools and background needed for component repair.

Engine, Fuel Injection and Cooling

Engine procedures extend from internal inspection and overhaul to oil-pump, water-pump, thermostat and turbocharger service. Injection-pump timing and calibration specifications are included; internal injection-pump repair is referred to the separate TM-1109 publication, which is not included.

The fuel-system instructions flag a specific damage risk: turning the injection pump’s outlet fittings while working on the injection lines can damage the pump internally.

Power Shift Transmission and Differential Setup

The October 1987 revision clarifies flat and wavy plate installation in the C1 and C2 clutches. Serial-number distinctions and the updated-transmission “X” marking help match the clutch procedure and replacement parts to the assembly being serviced.

Planetary-reduction and differential illustrations support bearing, gear and seal work. Differential-lock operation drawings and an air-leakage test illustration explain the components involved in checking the locking mechanism.

Hydraulic Pumps, Steering and Brakes

Main-pump procedures distinguish pump versions and cover pistons, valves, bearings and seals. Oil-flow drawings and steering-valve right-turn and left-turn views help connect the repair instructions with the internal passages.

For the later pump-drive arrangement, the manual warns that rearward force against the crankshaft pulley can cause premature crankshaft thrust-washer failure. Hydraulic-service cautions also address the skin-injection hazard from escaping pressurized fluid.

Brake and emergency-steering accumulator procedures distinguish their piston and bladder designs. This is the Repair volume; the separately referenced Section 90 system-operation, diagnosis and test material is not included.

Electrical Testing, ROPS and Cab Equipment

Starter no-load test diagrams, alternator component checks and the fire-suppression harness drawing with sensor locations provide specific electrical references. Coverage also includes circuit protection and neutral-start switch adjustment.

Chassis and operator-station work includes ROPS removal and installation, cab glazing, windshield wipers, seat components and the cab heater. Maintenance charts and lubrication information support routine workshop service.

Winch, Blade and Grapple Repair

Winch procedures cover drum bearings, drive clutches, brake-band adjustment and control-valve repair. Hold, wind-in and free-spool operating views show how the winch’s hydraulic controls relate to its working modes.

Blade cylinders and controls, adjustable log arches, grapple jaws, boom components and rotary manifolds have their own repair coverage. The early Ross grapple rotate motor is treated as a replacement unit because internal service parts are unavailable; the later GEROLER motor has disassembly and assembly procedures.

Selected Differential Adjustment Specifications

The differential section specifies housing-bearing preload of 0.002–0.005 in. (0.05–0.13 mm) and ring-gear-to-pinion backlash of 0.007–0.0155 in. (0.18–0.394 mm). These values accompany the bearing-setting and gear-mesh procedures, with illustrations of the tooth contact pattern.

For the differential-lock hydraulic connections, the specified torque for the line connectors at the differential case is 30 lb-ft (41 N.m).

PDF Navigation and Workshop Use

Search and bookmarked navigation: The PDF includes a searchable OCR text layer and bookmarks for sections and individual procedures. OCR errors can affect searches, and the grapple-skidder periodic-service chart has no searchable text layer. Small labels in the electrical test diagrams and hydraulic illustrations are readable with magnification.

Supplied as one printable, English-language PDF with 772 pages, including two cover pages, one revision notice and 66 blank or header-only pages.