Description

Gehl Z55, Mustang 550Z Compact Excavator Repair Service Manual

Language: English
Format: PDF
Applicable for the Gehl Excavator  Model Gehl Z55, Mustang 550Z

• Gehl Z55, Mustang 550Z Excavator Repair Service Manual – 760 Pages
• Gehl Z55, Mustang 550Z Excavator Operators Manual – 342 Pages
• Gehl Z55, Mustang 550Z Excavator Parts Manual – 430 Pages

Table of Content of the Gehl Z55, Mustang 550Z Excavator Manual:

CHAPTER 1
GENERAL CAUTIONS FOR MAINTENANCE WORK
1-1 Correct Work ………………………………………………………………………………………………………………………………………………………1-1
1-2 Safety Precautions ………………………………………………………………………………………………………………………………………………1-2
1-3 Preparations……………………………………………………………………………………………………………………………………………………….1-3
1-4 Cautions for Disassembly and Reassembly…………………………………………………………………………………………………………….1-4
1-5 Cautions for Removal and Installation of Hydraulic Equipment ………………………………………………………………………………….1-5
1-6 Cautions for Removal and Installation of Hydraulic Piping…………………………………………………………………………………………1-6
1-7 Cautions for Handling Seals………………………………………………………………………………………………………………………………….1-7
1-8 Correct Installation of Hydraulic Hose…………………………………………………………………………………………………………………….1-8
1-9 Specifications of Hydraulic Hose……………………………………………………………………………………………………………………………1-9
1-10 Air Release of Hydraulic Equipment……………………………………………………………………………………………………………………1-10
CHAPTER 2
TECHNICAL DATA
2-1 Specifications …………………………………………………………………………………………………………………………………………………. 2-1-1
2-2 Outline Drawing and Working Area……………………………………………………………………………………………………………………. 2-2-1
2-3 Weight List of Main Parts …………………………………………………………………………………………………………………………………. 2-3-1
2-4 Lifting Capacity List …………………………………………………………………………………………………………………………………………. 2-4-1
2-5 Specifications for Attachment……………………………………………………………………………………………………………………………. 2-5-1
2-6 Periodic Inspection and Servicing ……………………………………………………………………………………………………………………… 2-6-1
2-7 Fuel, Lube Oil and Grease Recommended…………………………………………………………………………………………………………. 2-7-1
2-8 Hydraulic Circuit Schematic ……………………………………………………………………………………………………………………………… 2-8-1
2-9 Wiring Diagram……………………………………………………………………………………………………………………………………………….. 2-9-1
CHAPTER 3
SERVICE STANDARDS
3-1 Machine Performance ……………………………………………………………………………………………………………………………………… 3-1-1
3-2 Engine …………………………………………………………………………………………………………………………………………………………… 3-2-1
3-2-1 Nominal and Allowable Values ………………………………………………………………………………………………………………….. 3-2-1
3-3 Undercarriage ………………………………………………………………………………………………………………………………………………… 3-3-1
3-3-1 Rubber Crawler Specifications ………………………………………………………………………………………………………………….. 3-3-1
3-3-2 Common Specifications of Rubber Crawlers……………………………………………………………………………………………….. 3-3-2
3-4 Controls…………………………………………………………………………………………………………………………………………………………. 3-4-1
3-5 Hydraulic Equipment ……………………………………………………………………………………………………………………………………….. 3-5-1
3-5-1 Hydraulic Cylinders …………………………………………………………………………………………………………………………………. 3-5-1
3-6 Implement ……………………………………………………………………………………………………………………………………………………… 3-6-1
3-6-1 Front Attachments …………………………………………………………………………………………………………………………………… 3-6-1
3-6-2 Blade Moving Device……………………………………………………………………………………………………………………………….. 3-6-2
3-6-3 Bucket Teeth ………………………………………………………………………………………………………………………………………….. 3-6-3
3-7 List of Tightening Torque …………………………………………………………………………………………………………………………………. 3-7-1
3-7-1 Machine…………………………………………………………………………………………………………………………………………………. 3-7-1
3-7-2 Engine …………………………………………………………………………………………………………………………………………………… 3-7-6
3-7-3 Tightening Torque for General Bolts and Nuts…………………………………………………………………………………………….. 3-7-8
3-7-4 Hydraulic Fitting………………………………………………………………………………………………………………………………………. 3-7-9
3-8 Pressure Adjustment……………………………………………………………………………………………………………………………………….. 3-8-1
3-8-1 Relief Valves ………………………………………………………………………………………………………………………………………….. 3-8-1
3-8-2 Swing Brake Valve ………………………………………………………………………………………………………………………………….. 3-8-4
3-8-3 Cut-Off Valve………………………………………………………………………………………………………………………………………….. 3-8-5
CHAPTER 4
ENGINE
4-1 Safety ……………………………………………………………………………………………………………………………………………………………. 4-1-1
4-1-1 Safety Statements …………………………………………………………………………………………………………………………………… 4-1-1
4-1-2 Safety Precautions ………………………………………………………………………………………………………………………………….. 4-1-2
4-2 Engine …………………………………………………………………………………………………………………………………………………………… 4-2-1
4-2-1 Before You Begin Servicing ……………………………………………………………………………………………………………………… 4-2-1
4-2-2 Introduction…………………………………………………………………………………………………………………………………………….. 4-2-2
4-2-3 Special Service Tools………………………………………………………………………………………………………………………………. 4-2-3
4-2-4 Measuring Instruments…………………………………………………………………………………………………………………………….. 4-2-6
4-2-5 Cylinder Head…………………………………………………………………………………………………………………………………………. 4-2-8
4-2-6 Measuring and Adjusting Valve Clearance ……………………………………………………………………………………………….. 4-2-23
4-2-7 Crankshaft and Camshaft Components ……………………………………………………………………………………………………. 4-2-25
4-2-8 EGR System…………………………………………………………………………………………………………………………………………. 4-2-51
4-2-9 Intake Throttle ………………………………………………………………………………………………………………………………………. 4-2-58
4-3 Fuel System …………………………………………………………………………………………………………………………………………………… 4-3-1
4-3-1 Before You Begin Servicing ……………………………………………………………………………………………………………………… 4-3-1
4-3-2 System Structure…………………………………………………………………………………………………………………………………….. 4-3-2
4-3-3 Fuel System Specifications ………………………………………………………………………………………………………………………. 4-3-4
4-3-4 Fuel System Diagram………………………………………………………………………………………………………………………………. 4-3-5
4-3-5 Fuel System Components ………………………………………………………………………………………………………………………… 4-3-6
4-4 Cooling System………………………………………………………………………………………………………………………………………………. 4-4-1
4-4-1 Before You Begin Servicing ……………………………………………………………………………………………………………………… 4-4-1
4-4-2 Introduction…………………………………………………………………………………………………………………………………………….. 4-4-2
4-4-3 Cooling System Diagram………………………………………………………………………………………………………………………….. 4-4-2
4-4-4 Engine Coolant Pump Components …………………………………………………………………………………………………………… 4-4-3
4-4-5 Engine Coolant System Check………………………………………………………………………………………………………………….. 4-4-4
4-4-6 Engine Coolant Pump ……………………………………………………………………………………………………………………………… 4-4-4
4-5 Lubrication System………………………………………………………………………………………………………………………………………….. 4-5-1
4-5-1 Before You Begin Servicing ……………………………………………………………………………………………………………………… 4-5-1
4-5-2 Introduction…………………………………………………………………………………………………………………………………………….. 4-5-2
4-5-3 Lubrication System Diagram …………………………………………………………………………………………………………………….. 4-5-2
4-5-4 Checking Engine Oil Pressure ………………………………………………………………………………………………………………….. 4-5-3
4-5-5 Oil Pump Components …………………………………………………………………………………………………………………………….. 4-5-3
4-6 Turbocharger………………………………………………………………………………………………………………………………………………….. 4-6-1
4-6-1 Before You Begin Servicing ……………………………………………………………………………………………………………………… 4-6-1
4-6-2 Introduction…………………………………………………………………………………………………………………………………………….. 4-6-1
4-6-3 Specifications …………………………………………………………………………………………………………………………………………. 4-6-1
4-6-4 Troubleshooting………………………………………………………………………………………………………………………………………. 4-6-2
4-6-5 Turbocharger Components ………………………………………………………………………………………………………………………. 4-6-4
4-6-6 Turbocharger Component Functions………………………………………………………………………………………………………….. 4-6-5
4-6-7 Washing Procedure…………………………………………………………………………………………………………………………………. 4-6-7
4-6-8 Periodic Inspection ………………………………………………………………………………………………………………………………….. 4-6-8
4-7 Starter Motor ………………………………………………………………………………………………………………………………………………….. 4-7-1
4-7-1 Before You Begin Servicing ……………………………………………………………………………………………………………………… 4-7-1
4-7-2 Introduction…………………………………………………………………………………………………………………………………………….. 4-7-2
4-7-3 Starter Motor Specifications ……………………………………………………………………………………………………………………… 4-7-2
4-7-4 Starter Motor Troubleshooting…………………………………………………………………………………………………………………… 4-7-3
4-7-5 Starter Motor Components ……………………………………………………………………………………………………………………….. 4-7-4
4-7-6 Starter Motor ………………………………………………………………………………………………………………………………………….. 4-7-5
4-8 Alternator……………………………………………………………………………………………………………………………………………………….. 4-8-1
4-8-1 Before You Begin Servicing ……………………………………………………………………………………………………………………… 4-8-1
4-8-2 Introduction…………………………………………………………………………………………………………………………………………….. 4-8-2
4-8-3 Alternator Specifications…………………………………………………………………………………………………………………………… 4-8-2
4-8-4 Alternator Troubleshooting ……………………………………………………………………………………………………………………….. 4-8-3
4-8-5 Alternator Components ……………………………………………………………………………………………………………………………. 4-8-4
4-8-6 Alternator Wiring Diagram ………………………………………………………………………………………………………………………… 4-8-5
4-8-7 Alternator Standard Output ………………………………………………………………………………………………………………………. 4-8-6
4-8-8 Alternator……………………………………………………………………………………………………………………………………………….. 4-8-7
4-9 Electronic Control System………………………………………………………………………………………………………………………………… 4-9-1
4-9-1 Engines Available with the Electronic Control System………………………………………………………………………………….. 4-9-1
4-9-2 Before You Begin Servicing ……………………………………………………………………………………………………………………… 4-9-1
4-9-3 System Structure…………………………………………………………………………………………………………………………………….. 4-9-3
4-9-4 How to Remove and Reattach the Diesel Particulate Filter (DPF)………………………………………………………………… 4-9-11
4-9-5 SF and DPF Maintenance Kit………………………………………………………………………………………………………………….. 4-9-21
4-9-6 Troubleshooting of Electronic Control System …………………………………………………………………………………………… 4-9-22
4-9-7 Replacement of Components………………………………………………………………………………………………………………….. 4-9-25
4-9-8 Installation Position of Sensors ……………………………………………………………………………………………………………….. 4-9-29
4-10 Electric Wiring ……………………………………………………………………………………………………………………………………………. 4-10-1
4-10-1 Electric Wiring Precautions ………………………………………………………………………………………………………………….. 4-10-1
4-11 Failure Diagnosis ……………………………………………………………………………………………………………………………………….. 4-11-1
4-11-1 Special Service Tools…………………………………………………………………………………………………………………………… 4-11-1
4-11-2 Troubleshooting By Measuring Compression Pressure …………………………………………………………………………….. 4-11-2
4-12 Troubleshooting …………………………………………………………………………………………………………………………………………. 4-12-1
4-12-1 Quick Reference Table for Troubleshooting……………………………………………………………………………………………. 4-12-1
CHAPTER 5
ELECTRIC SYSTEM
5-1 Electric Equipment of Machine………………………………………………………………………………………………………………………….. 5-1-1
5-1-1 Parts Layout of Electrical Equipment …………………………………………………………………………………………………………. 5-1-1
5-1-2 LCD Monitor and Alarm Systems …………………………………………………………………………………………………………….. 5-1-13
5-2 Circuit Description of Engine Start and Stop……………………………………………………………………………………………………….. 5-2-1
5-3 Engine ECU (engine controller)…………………………………………………………………………………………………………………………. 5-3-1
5-3-1 Engine ECU……………………………………………………………………………………………………………………………………………. 5-3-1
5-3-2 Circuit Description of Auto Deceleration Mode…………………………………………………………………………………………….. 5-3-3
5-3-3 Circuit Description of Eco Mode ………………………………………………………………………………………………………………… 5-3-4
5-3-4 Control Functions ……………………………………………………………………………………………………………………………………. 5-3-5
5-4 Hydraulic ECU (Controller)……………………………………………………………………………………………………………………………….. 5-4-1
5-5 Error Code List ……………………………………………………………………………………………………………………………………………….. 5-5-1
CHAPTER 6
HYDRAULIC SYSTEM
6-1 Outline…………………………………………………………………………………………………………………………………………………………… 6-1-1
6-1-1 Control Valve Operation …………………………………………………………………………………………………………………………… 6-1-3
6-1-2 Additional Operation of Control Valve ………………………………………………………………………………………………………… 6-1-4
6-2 Circuit Operation …………………………………………………………………………………………………………………………………………….. 6-2-1
6-2-1 Boom …………………………………………………………………………………………………………………………………………………….. 6-2-1
6-2-2 Arm……………………………………………………………………………………………………………………………………………………….. 6-2-2
6-2-3 Bucket …………………………………………………………………………………………………………………………………………………… 6-2-3
6-2-4 Swing…………………………………………………………………………………………………………………………………………………….. 6-2-4
6-2-5 Boom Swing …………………………………………………………………………………………………………………………………………… 6-2-5
6-2-6 Blade …………………………………………………………………………………………………………………………………………………….. 6-2-6
6-2-7 Travel ……………………………………………………………………………………………………………………………………………………. 6-2-9
6-2-8 Non-Deviation Travel (with Boom, Arm or Boom Swing Operation)………………………………………………………………. 6-2-10
6-2-9 Non-Deviation Travel (with Bucket Operation) …………………………………………………………………………………………… 6-2-11
6-2-10 Simultaneous Operation of Boom Up and Arm Retract……………………………………………………………………………… 6-2-12
6-2-11 Simultaneous Operation of Boom Up and Bucket…………………………………………………………………………………….. 6-2-13
6-2-12 Simultaneous Operation of Boom Up and Swing ……………………………………………………………………………………… 6-2-14
6-2-13 Simultaneous Operation of Arm and Bucket ……………………………………………………………………………………………. 6-2-15
6-2-14 Hydraulic P.T.O. ………………………………………………………………………………………………………………………………….. 6-2-16
6-2-15 Quick Coupler (Quick coupler spec.)………………………………………………………………………………………………………. 6-2-17
6-2-16 Travel Alarm ……………………………………………………………………………………………………………………………………….. 6-2-18
6-2-17 Auto Deceleration………………………………………………………………………………………………………………………………… 6-2-19
6-3 Hydraulic Pump………………………………………………………………………………………………………………………………………………. 6-3-1
6-4 Control Valve………………………………………………………………………………………………………………………………………………….. 6-4-1
6-5 Pilot Valve ……………………………………………………………………………………………………………………………………………………… 6-5-1
6-6 Swing Motor …………………………………………………………………………………………………………………………………………………… 6-6-1
6-7 Travel Motor …………………………………………………………………………………………………………………………………………………… 6-7-1
6-8 Proportional Solenoid Valve……………………………………………………………………………………………………………………………… 6-8-1
6-8-1 Proportional Solenoid Valve for P.T.O. (Without Air Conditioner spec.) ………………………………………………………….. 6-8-1
6-8-2 Proportional Solenoid Valve for P.T.O. and Engine Speed Sensing (Air Conditioner spec.) ………………………………. 6-8-7
6-9 Solenoid Valve for Blade Angling Control (Angle blade spec. only)………………………………………………………………………… 6-9-1
6-10 Pilot Check Valve (For Quick Coupler Circuit) ……………………………………………………………………………………………….. 6-10-1
6-11 2-way valve ………………………………………………………………………………………………………………………………………………… 6-11-1
CHAPTER 7
ADJUSTMENT AND REPAIR
7-1 Engine and Electric Equipment …………………………………………………………………………………………………………………………. 7-1-1
7-1-1 Removal and Reinstallation of Engine ……………………………………………………………………………………………………….. 7-1-1
7-1-2 Removal and Reinstallation of Starter Motor……………………………………………………………………………………………… 7-1-14
7-1-3 Removal and Reinstallation of Radiator and Oil Cooler ………………………………………………………………………………. 7-1-16
7-1-4 Removal and Reinstallation of Fan Belt and Compressor Driving Belt ………………………………………………………….. 7-1-21
7-1-5 Removal and Reinstallation of Engine ECU………………………………………………………………………………………………. 7-1-24
7-1-6 Removal and Reinstallation of Hydraulic ECU (Air conditioner spec.) …………………………………………………………… 7-1-26
7-1-7 Removal and Reinstallation of Diesel Particulate Filter (DPF) ……………………………………………………………………… 7-1-27
7-2 Undercarriage ………………………………………………………………………………………………………………………………………………… 7-2-1
7-2-1 Outline …………………………………………………………………………………………………………………………………………………… 7-2-1
7-2-2 Points of Reassembly (Rubber Track) ……………………………………………………………………………………………………….. 7-2-2
7-2-3 Removal and Reinstallation of Crawler ………………………………………………………………………………………………………. 7-2-3
7-2-4 Removal and Reinstallation of Travel Motor ……………………………………………………………………………………………….. 7-2-4
7-2-5 Disassembly and Reassembly of Idler ……………………………………………………………………………………………………….. 7-2-6
7-2-6 Disassembly and Reassembly of Track Roller…………………………………………………………………………………………….. 7-2-9
7-2-7 Disassembly and Reassembly of Carrier Roller…………………………………………………………………………………………. 7-2-12
7-2-8 Installation of Floating Seal …………………………………………………………………………………………………………………….. 7-2-14
7-2-9 Drawings of Jig……………………………………………………………………………………………………………………………………… 7-2-15
7-3 Controls…………………………………………………………………………………………………………………………………………………………. 7-3-1
7-3-1 Mechanical Control Linkage ……………………………………………………………………………………………………………………… 7-3-1
7-3-2 Adjustment of Travel Levers……………………………………………………………………………………………………………………… 7-3-3
7-3-3 Adjustment of Boom Swing Pedal ……………………………………………………………………………………………………………… 7-3-4
7-3-4 Adjustment of Blade Lever ……………………………………………………………………………………………………………………….. 7-3-4
7-3-5 Adjustment of Lock Lever…………………………………………………………………………………………………………………………. 7-3-5
7-4 Swing Bearing ………………………………………………………………………………………………………………………………………………… 7-4-1
7-5 Hydraulic Equipment ……………………………………………………………………………………………………………………………………….. 7-5-1
7-5-1 Removal and Reinstallation of Hydraulic Pump …………………………………………………………………………………………… 7-5-1
7-5-2 Removal and Reinstallation of Control Valve ………………………………………………………………………………………………. 7-5-3
7-5-3 Removal and Reinstallation of Pilot Valves (L and R)…………………………………………………………………………………… 7-5-7
7-5-4 Removal and Reinstallation of Swing Motor………………………………………………………………………………………………… 7-5-9
7-5-5 Removal and Reinstallation of Swivel Joint……………………………………………………………………………………………….. 7-5-11
7-5-6 Disassembly and Reassembly of Swivel Joint …………………………………………………………………………………………… 7-5-17
7-5-7 Disassembly and Reassembly of Hydraulic Cylinder ………………………………………………………………………………….. 7-5-20
7-5-8 Removal and Reinstallation of Hydraulic Oil Tank ……………………………………………………………………………………… 7-5-29
7-5-9 Piping Layout………………………………………………………………………………………………………………………………………… 7-5-38
7-6 Work Implements ……………………………………………………………………………………………………………………………………………. 7-6-1
7-6-1 Removal and Reinstallation of Work Implements…………………………………………………………………………………………. 7-6-1
7-6-2 Quick Coupler……………………………………………………………………………………………………………………………………….. 7-6-11
7-7 Cabin…………………………………………………………………………………………………………………………………………………………….. 7-7-1
7-7-1 Removal and Reinstallation of Cabin …………………………………………………………………………………………………………. 7-7-1
7-7-2 Disassembly and Reassembly of Cabin……………………………………………………………………………………………………… 7-7-5
7-8 Air Conditioner ……………………………………………………………………………………………………………………………………………….. 7-8-1
7-8-1 Removal and Reinstallation of Air Conditioner…………………………………………………………………………………………….. 7-8-1
CHAPTER 8
TROUBLESHOOTING
8-1 Non-Breakdowns…………………………………………………………………………………………………………………………………………….. 8-1-1
8-1-1 Natural Release of Bucket………………………………………………………………………………………………………………………… 8-1-1
8-1-2 Discontinuous Arm Movement ………………………………………………………………………………………………………………….. 8-1-1
8-1-3 Drifting of Upperstructure on Quick Travel Operation …………………………………………………………………………………… 8-1-2
8-1-4 Thermal Shock of Travel Motor …………………………………………………………………………………………………………………. 8-1-3
8-1-5 Elongation of Boom Swing Cylinder on 68 degrees Swing ……………………………………………………………………………. 8-1-4
8-1-6 Time Lag on Travel Speed Switching…………………………………………………………………………………………………………. 8-1-5
8-1-7 Fluctuation in Oil Level of Hydraulic Oil Tank Due to Temperature Change…………………………………………………….. 8-1-6
8-1-8 Operation of Quick Coupler Cylinder (for Quick Coupler Type) ……………………………………………………………………… 8-1-7
8-2 Quick Reference Table for Troubleshooting………………………………………………………………………………………………………… 8-2-1
APPENDIX
Wiring Diagram

This Service Manual is intended for Gehl Z55, Mustang 550Z Excavator so as to give the owner/operator assistance in preparing, adjusting, maintaining and servicing the machine. More importantly, this manual provides an operating plan for safe and proper use of the machine. Major points of safe operation are
detailed in Chapter 2 – Safety. Read and understand the contents of this manual completely and become familiar with the machine before
attempting to operate it..

Throughout this manual, information is introduced by the word NOTE or IMPORTANT. Be sure to read the message carefully and comply with the message. Following this information will improve operating and maintenance efficiency, help to avoid breakdown and damage and extend the service life of the machine.