JCB 802, 802.4 & 802 Super 1994–2005 Mini Excavator Service Manual (P/N 9803/3140)

This JCB service manual, P/N 9803/3140, Issue 4, covers the 1994–2005 802, 802.4, and 802 Super mini excavators, including cab and canopy configurations.

Text Search, Bookmarks, and Diagram Detail

Finding service information: The PDF is partially searchable, with gaps in some operating and electrical text and certain diagram labels. Fifteen numbered bookmarks provide jumps at 20-page intervals rather than named chapter links. Dense wiring diagrams and connector tables require enlargement for small labels.

One printable English PDF contains 293 pages, including the original cover and introduction, one page each.

Hydraulic Testing, Engine Repair, and Running Gear

The topics below are selected coverage highlights, not a full contents list. Further subjects include storage preparation and machine transport.

• Engine repair: Step-by-step engine removal and installation, cylinder-head service, piston and connecting-rod inspection, and crankshaft and timing-gear work.

• Fuel and cooling: Injection-pump replacement, injection-timing adjustment, injector testing, model-specific fuel bleeding, water-pump replacement, and thermostat inspection.

• Hydraulic components: Gear and variable-displacement pumps, control valves, hydraulic cylinders, and rotary couplings, with dismantling, inspection, and pressure-testing procedures.

• Electrical diagnosis: Starting and charging checks, wiring diagrams, connector-terminal tables, wire identification, and sealed wiring-harness repairs.

• Track and slew drives: Track-motor fault finding, planetary gearbox overhaul, rubber and steel track replacement, and roller, idler, and recoil-unit service.

• Controls and framework: Servo hand controllers, auxiliary-pedal cables, and removal procedures for the boom, dipper, kingpost, slew ring, and cab.

• Attachments: Quickhitch installation and maintenance, bucket-tooth replacement, and representative single-acting and double-acting auxiliary hydraulic circuit installations.

Written for JCB distributor service engineers receiving or having completed JCB training, this manual assumes sound workshop practice and experience with hydraulic earthmoving equipment.

Maintenance Planning and Engine Inspection

Service schedules cover engine oil, hydraulic fluid, and filters, with lubrication points for the boom, dipper, bucket, and slew ring. Coolant-mixture and oil-viscosity tables support maintenance planning across operating temperatures.

Torque tables distinguish Dacromet-coated fasteners from zinc-plated hardware. Cylinder-bore, valve-guide, bearing-clearance, and crankshaft limits let technicians compare inspection measurements with the relevant replacement criteria.

The engine chapter also references Perkins manual 9806/2100 for further information; that separate publication is not included.

Pump Diagnosis and Hydraulic Component Changes

The 802 Super flow-test procedure addresses slow hydraulics and engine lugging with black smoke, distinguishing relief-valve checks from pump-performance testing. It specifies the test setup and readings. Pump calibration instructions require separate guidance from JCB.

The service-tool references identify the hydraulic pressure-test kit 892/00253 and flow-monitoring unit 892/00268. Hydraulic circuit diagrams, servo-circuit descriptions, and the pump-flow graph connect test readings with system operation. Separate procedures cover main, auxiliary, servo, and slew crossline relief valves, distinguishing adjustable valves from nonadjustable cartridges.

On the 802 Super, disturbing the factory-aligned pump adapter plate can cause premature drive-coupling failure.

Early and later rotary couplings are distinguished, including conversion from 45/910000 to 45/914500. The kingpost sections explain why the revised assembly can replace the early version only as a complete unit.

Wiring Selection and Undercarriage Repairs

Electrical schematics cover the listed models, with separate 802 Super circuits before and after the documented serial break. Mainframe harness drawings are included for 802.4 machines from 732558 through 732999 and 802 Super machines from 733001; earlier mainframe harness variants are indexed without their individual drawings.

Cab and canopy harness drawings identify connectors, pin connections, and wire destinations. The diagnostic charts address starter, charging, lighting, servo, and tracking faults.

Exploded gearbox views and roller-face-seal illustrations support internal inspection. The slew gearbox instructions warn that misaligned mounting dowels can be driven through the slew frame against the slew ring, potentially requiring separation of the upper structure from the undercarriage.

Control Arrangements and Attachment Installation

Servo-controller port diagrams distinguish ISO and 3CX arrangements; the operating section also explains selectable ISO/SAE controls. Seat-pod and floorplate removal procedures describe access to concealed components.

The single-acting circuit 980/88806 and double-acting circuit 980/88807 sections cover hose routing and pedal/cable fitting. Their illustrations are representative; the instructions supplied with the specific attachment kit take precedence.

Safety guidance addresses trapped hydraulic pressure, supported attachments, heavy lifting, and restrictions on repairs to ROPS, TOPS, and FOGS structures.

A Preview of Valve and Timing-Gear Specifications

Valve adjustment: Both listed engine types use a cold valve clearance of 0.2 mm (0.008 in.), documented alongside the cylinder-head reassembly and valve-adjustment procedures.

Timing-gear inspection: The data lists 0.08 mm (0.003 in.) backlash for new timing gears and a 0.25 mm (0.010 in.) service limit, supported by the camshaft and timing-gear inspection instructions.