Gehl Z80 Gen 2, Mustang 800Z Nxt 2 Compact Excavator Repair Service Manual

Key Chapters and Highlights

1. General Cautions for Maintenance Work

• Safety Precautions: Emphasizes correct maintenance practices to ensure safety and prevent damage.
• Handling Hydraulic Systems: Covers proper methods for handling hydraulic equipment, piping, seals, and hoses.
• Specifications: Includes specifications for hydraulic hoses and guidelines for air release in hydraulic systems.

2. Technical Data

• Specifications and Dimensions: Includes machine specifications, weight distribution, lifting capacities, and working area dimensions.
• Hydraulic and Wiring Diagrams: Provides schematic layouts for hydraulic circuits and electrical systems.
• Maintenance Schedule: Recommends periodic inspection, servicing, and lubricants.

3. Service Standards

• Performance Standards: Covers performance benchmarks for the engine, hydraulic systems, and undercarriage.
• Tightening Torques: Lists torque specifications for bolts, nuts, and hydraulic fittings.
• Pressure Adjustments: Includes procedures for adjusting relief valves and brake valves.

4. Engine

• Servicing Procedures: Detailed steps for servicing the engine, including valve adjustments, cylinder head work, and crankshaft maintenance.
• EGR System and DPF: Covers emission control systems like the exhaust gas recirculation (EGR) system and diesel particulate filter (DPF) maintenance.
• Cooling and Lubrication Systems: Instructions for maintaining coolant pumps, oil pumps, and checking oil pressure.
• Troubleshooting: Provides troubleshooting guides for common engine issues.

5. Electric System

• Electrical Components Layout: Details the location and function of electrical parts, including LCD monitors and alarm systems.
• Electronic Controls: Covers start/stop controls, engine ECU, and hydraulic ECU systems, including SMARTASSIST DIRECT (SA-D) functionality.
• Error Codes: Includes a comprehensive list of error codes and diagnostic tools.

6. Hydraulic System

• Circuit Operations: Explains the hydraulic functions for boom, arm, bucket, blade, swing, and travel systems.
• Pump and Valve Maintenance: Details servicing hydraulic pumps, control valves, and solenoid valves.
• Simultaneous Operations: Explains the handling of complex operations like combined boom and swing actions.
• Troubleshooting: Diagnoses common hydraulic system issues.

7. Adjustment and Repair

• Component Removal and Reinstallation: Guides for key components, including the engine, hydraulic pump, and cabin.
• Undercarriage Maintenance: Covers crawler removal, travel motor servicing, and reassembly of idlers and rollers.
• Hydraulic Cylinder Repair: Provides detailed instructions for disassembling, reassembling, and inspecting hydraulic cylinders.
• Air Conditioning: Includes steps for removing and reinstalling air conditioning systems.

8. Troubleshooting

• Non-Breakdown Issues: Addresses minor operational problems like bucket release and arm movement irregularities.
• Quick Reference Tables: Offers tables for diagnosing and resolving common machine issues.