This is the factory service manual for the Mustang 920 and 930A skid steer loaders, published under part number 008-12909, running the Yanmar 3TNA72E-S and 3TN82E diesel engines. Its 97 pages cover the whole machine: specifications, safety equipment, steering controls, the hydraulic and hydrostatic drive systems, the chain case, the engine, and the electrical system.
You get separate 920 and 930A specifications, a maintenance chart, standard and metric torque values, and hose and fitting procedures. The troubleshooting content spans the hydraulic and hydrostatic circuits, drive chains and brakes, and the wiring diagrams for both models.
Owners and independent mechanics can use it to trace hydraulic leaks, rebuild cylinders, diagnose lost drive, adjust drive chains, and chase electrical faults. You download it as a PDF that opens on a phone, tablet, or computer, and you can print the pages you need.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 4-5 | Manual Purpose and Content, Safety Equipment Importance, Serial Number Location, Company Policy on Product Improvements, Serial Number Tag Location Figure |
| Specifications | 6-7 | 930A General Specifications (Unit Description, Engine Specifications, Fluid Capacities, Hydraulic System, Transmission and Final Drives, Hydraulic Cylinders, Operating Specifications) |
| Safety Equipment | 8-15 | Roll Over Protective Structure Removal and Installation, Lift Arm Stops, Seat Belt Lock-Out, Parking Brake, Neutral Start Switches |
| System Contamination Control | 16-27 | Maintenance Chart, Access Panels, Standard Torque Value Specifications, Metric Torque Value Specifications, Torque Specifications and Procedures Hoses & Fittings, Special Tools |
| Steering Controls | 28-35 | Troubleshooting, T-Bar Adjustments, T-Bar Removal and Installation, Neutral Centering Device Adjustments, Neutral Centering Device (Service and Repair, Diagram) |
| Hydraulic System | 36-53 | Troubleshooting, Pressure Check, Model 920/930A Flow Chart, Lift Circuit Leak Down Test, Tilt Circuit Leak Down Test, Hydraulic Cylinder Testing |
| Hydrostatic Drive System | 54-65 | Trouble Shooting, Drive System Diagram, System Checks Charge Pressure, Directional Check Relief Valve Combination, Closed Loop, Piston Pump, Hydrostatic Drive Motor |
| Chain Case | 66-77 | Trouble Shooting, Brake Assembly (Service and Repair I), Drive Chain (Adjustments / Chain Case Covers Removed, Adjustments / Chain Case Covers in Place, Removal and Installation) |
| Engine | 78-87 | General Information Model Specifications, Trouble Shooting, Engine Hydrostatic Pump Removal and Installation, Components Removal and Installation, Cooling System |
| Electrical System | 88-97 | Trouble Shooting, 920 Wiring Diagram, 930A Wiring Diagram, Instrument Panel, Starting Circuit, Starter Motor Disassembly, Charging Circuit, Alternator Disassembly |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Axle sprocket retaining nut torque (initial) | 100 ft. lbs. (136 Nm) | p. 75 |
| Axle sprocket retaining nut torque (final) | 30 ft. lbs. (41 Nm) | p. 75 |
| J.I.C. (SAE 37° flare) Fittings Torque (Hose & Tubing Diameter 1/4") | 8-12 Foot-Pounds | p. 23 |
| J.I.C. (SAE 37° flare) Fittings Torque (Hose & Tubing Diameter 5/16") | 12-17 Foot-Pounds | p. 23 |
| J.I.C. (SAE 37° flare) Fittings Torque (Hose & Tubing Diameter 3/8") | 15-25 Foot-Pounds | p. 23 |
| J.I.C. (SAE 37° flare) Fittings Torque (Hose & Tubing Diameter 1/2") | 25-42 Foot-Pounds | p. 23 |
| Lift cylinder gland locking nut torque | 215-225 ft. lbs. (292-305 Nm) | p. 46 |
| Tilt cylinder gland locking nut torque | 450-500 ft. lbs. (610-678 Nm) | p. 46 |
| Hydraulic System Fluid Capacity | 7.5 gal. (28.4 L) | p. 6 |
| Lift Circuit Leak Down Test - Rate of Movement in 10 Minutes | 1.8 in. (45.7 mm) | p. 41 |
| Tilt Circuit Leak Down Test - Rate of Movement in 10 Minutes (for excessive leakage) | greater than 1-1/2 inches (38.1 mm) per hour (1/4 inch {6.4 mm} in 10 minutes) | p. 42 |
