1994-2005 JCB 802.7, 803, 804 Plus & Super Mini Excavator Service Manual (P/N 9803/3145)
JCB Models Covered & Key Technical Specifications
Models: JCB 802.7, JCB 803, JCB 804
Sub-models / Variants: Plus, Super, Standard, Canopy, Cabin
Model Years: 1994–2005
Serial Numbers: 0802.7, 0803, 0804
Technical Data:
- Engine electrical system: 12V negative earth
- Battery capacity (802.7/803): 75 Ah (wet), 60 Ah (dry)
- Battery capacity (804): 103 Ah (wet), 96 Ah (dry)
- Hydraulic pump type: Triple gear pump or variable displacement pump depending on model
- Main Relief Valve (M.R.V.) pressure: 172 bar (2500 lbf/in²) to 190 bar (2750 lbf/in²)
- Slew motor speed: 9.5 rev/min (802.7/803), 10.3 rev/min (804 Plus)
- Main bypass filtration pressure: 1.5 bar (22 lbf/in²)
JCB Manual Features & Content Preview
- Official JCB publication 9803/3145, Issue 3, covering the 1994–2005 JCB 802.7, 803, and 804 mini excavators (including Plus and Super variants with standard or canopy configurations)
- This 196-page factory reference documents core mechanical, electrical, and hydraulic specifications for the build generations
- Contains 4 detailed hydraulic circuit schematics and 14 electrical harness reference tables tailored for diagnostic analysis
- Outlines control pattern configurations specific to the Plus and Super series
Operational Guidance and Electrical Systems
This publication breaks down the structural technical data required for daily shop work, focusing heavily on machine operation, electrical circuits, and hydraulic configurations. The content outlines safe starting procedures, cab controls, and heater operation. Routine maintenance parameters are clearly defined, highlighting tasks like fan belt replacement and alternator servicing.
For electrical diagnostics, the manual delivers wiring harness specifications alongside fuse block ratings and comprehensive circuit diagrams. It provides structured troubleshooting logic to help mechanics quickly isolate electrical faults within the instrument cluster or trace operational issues back to the hydraulic pump.
Hydraulic Data and Specifications
Technical sections deliver precise pump flow rates, relief valve operating pressures, and cylinder dimensions. Mechanics will find main relief valve pressures cataloged across varying model-specific serial numbers. The documentation lists slew motor performance metrics and hydraulic filtration pressure settings for each equipment variant.
Furthermore, the guide supports advanced hydraulic fault diagnosis through component-level identification and pressure testing guidelines for main, auxiliary, and servo relief valves. Please remember that all service data detailed here serves as a baseline reference. Proper OEM documentation and certified professional expertise remain essential prior to executing any hands-on mechanical repairs or system tests.
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