Gehl Z80, Mustang 800Z Compact Excavator Repair Service Manual

Key Highlights by Chapter

1. General Cautions for Maintenance Work

• Safety Guidelines: Covers correct work procedures, preparation, and safety precautions.
• Hydraulic System Handling: Includes cautions for disassembling and installing hydraulic components, piping, seals, and hoses.
• Air Release: Procedures for hydraulic equipment air release are detailed.

2. Technical Data

• Specifications: Provides machine specifications and performance parameters.
• Diagrams: Includes hydraulic and wiring diagrams for US and AS/NZ specifications.
• Maintenance: Recommends periodic inspection and servicing with recommended fuel, oil, and grease.

3. Service Standards

• Machine and Engine Performance: Establishes benchmarks and tolerances.
• Torque Values: Specifies tightening torques for machine and hydraulic fittings.
• Pressure Adjustments: Includes relief valve and brake valve adjustments.

4. Engine

• Servicing Procedures: Step-by-step instructions for engine maintenance, including valve adjustments and emission systems like the EGR.
• Fuel and Lubrication Systems: Explains fuel system components, injection pump servicing, and lubrication checks.
• Cooling System: Covers pump servicing, coolant checks, and troubleshooting.
• Electrical Components: Includes alternator, starter motor, and ECU servicing.

5. Electric System

• Electrical Layout: Shows the parts layout of electrical components, including LCD monitors and alarm systems.
• Electronic Controls: Explains engine and hydraulic ECUs, along with error code diagnosis.
• Wiring: Offers a detailed wiring diagram and safety precautions.

6. Hydraulic System

• Operation Details: Describes the hydraulic circuits for boom, arm, bucket, blade, swing, and travel systems.
• Component Maintenance: Covers troubleshooting, disassembly, and reassembly of pumps, valves, and motors.
• Simultaneous Operations: Explains multi-action hydraulic functionality like boom and bucket simultaneous use.

7. Adjustment and Repair

• Component Removal and Installation: Details procedures for the engine, hydraulic systems, and undercarriage components.
• Cabin Repairs: Includes steps for cabin removal, reinstallation, and window/door glass replacement.
• Hydraulic Cylinder Servicing: Provides instructions for disassembly and reassembly.
• Air Conditioning: Guides on air conditioner removal and reinstallation.

8. Troubleshooting

• Non-Breakdown Issues: Diagnoses minor operational issues such as bucket release and time lag in travel speed switching.
• Quick Reference Tables: Simplifies troubleshooting for common machine faults.