JCB 801 Tracked Excavator Factory Service Manual PDF (P/N 9803/3161)

JCB Service publication 9803/3161 covers the JCB 801 Tracked Excavator, including early and later track-drive configurations. The file includes pages marked Issues 1, 2 and 3.

Text search, navigation and circuit detail: Text search is not available for the manual pages. Two bookmarks open the file's two parts; a printed contents page and alphabetical index provide further references. Small circuit labels require zooming.

• Hydraulics: Pump and control-valve service, main and auxiliary relief-valve pressure testing, motor fault-finding charts, ram repair, and rotary coupling service.

• Engine repair: KD 103-10 diesel removal, cylinder-head work, crankshaft and piston inspection, timing-gear service, and fuel-injection adjustments.

• Track and slew drive: Track motor counterbalance valves, slew motor brake valves, and track and slew gearbox disassembly, inspection and reassembly.

• Track and running gear: Steel and rubber track replacement and tensioning, roller service, and serial-specific idler and recoil unit procedures.

• Electrical diagnosis: Alternator and voltage regulator tests, starter motor repair, wiring diagrams, and optional engine shutdown connector details.

• Body and framework: Bucket linkage, long and short dipper options, boom removal, upper-structure disassembly, slew-ring installation, and control-mechanism adjustment.

Written for JCB distributor service engineers receiving or having completed JCB technical training, the manual assumes established workshop skills and experience maintaining and repairing hydraulic earthmoving equipment.

Hydraulic System Overview and Maintenance

The three-section gear pump and control valves are explained through the Neutral Pressure Circuit and motor-operation drawings, including travel motor counterbalance action and auxiliary relief valve functions. Hydraulic circuit schematics, component section views and exploded assembly drawings support the component procedures.

Track and slew motor fault charts address failure to rotate, uneven speed and excessive creep, with probable causes and inspection criteria. Maintenance coverage includes filter replacement intervals, oil-level checks and system pressure testing.

Pump repair limits: Dowty procedures cover dismantling, component inspection, reassembly and running-in. Sundstrand instructions limit repair to resealing a pump with satisfactory output; specified wear or persistent low output calls for complete replacement. The Dowty section warns that hammering the coupling off the shaft can cause internal pump damage.

Rams and test equipment: Boom and dipper ram resealing is covered alongside bucket, swing and dozer cylinders, with a separate boom damping-piston procedure. Relief-valve tests specify test block 892/00252 and hand pump 892/00223; cylinder work specifies C-spanners 892/00296 and 892/00297.

Hydraulic work requires control of stored pressure and secure support of raised equipment. Follow the manual's safety precautions and consult a qualified heavy equipment technician when needed.

Track Drive Variants and Running Gear

Machines through 649729 use spur-gear track reduction; machines from 649730 use a two-stage planetary drive. Matching this break to the machine helps select the correct motor, gearbox and idler/recoil procedures, including the different gearbox lubricant specifications.

The later gearbox instructions identify a planet carrier whose worn components require replacement as an assembly. Steel and rubber tracks use different center-roller mounting positions, while metallic face-seal instructions cover matched pairs and wear assessment.

KD 103-10 Engine, Fuel and Cooling

Internal engine coverage extends to valve guides and seats, piston rings, bearing clearances, crankshaft grinding limits, and camshaft inspection. Fuel-system work includes injection-pump removal, shim-based injection timing, injector spray testing and bleeding.

Water-pump and thermostat inspection accompany coolant service and fan-belt adjustment. The fan-belt section explains that incorrect tension can damage the timing case cover.

Component-specific torque tables, fluid capacities, intake and exhaust valve clearances, and an engine-oil grade chart support the mechanical repair procedures.

Charging Tests and Wiring Diagrams

Voltage and current output tests, maximum-field testing, and alternator-to-regulator continuity checks include test-result interpretation. Named illustrations include the Alternator–Regulator Circuit, Voltage Output Test, and Regulator N Circuit Continuity Test.

The machine Circuit Diagram has component and cable-color keys; the optional Engine Shut-down System includes connector views. Starter motor inspection covers the armature, field coil, brushes and solenoid.

Front Attachment and Upper Structure

Bucket, boom and dipper procedures include pivot wear limits; upper-structure work covers slew-ring orientation and control-linkage adjustment. These assemblies and their cylinders are covered, but the separate Attachments section listed in the contents is not included.

English PDF and Included Pages

Supplied as one printable English PDF. Its 216 pages include the cover, 15 blank pages, and one appended duplicate of the idler and recoil unit drawing, all counted in the total.