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 Mustang 920, 930A 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 |
Mustang 920, 930A Common Problems This Manual Covers
Hydraulic reservoir empties from a leak
These loaders are reported losing enough oil to empty the reservoir, usually from worn hoses, loose fittings, or failed seals around the lower lift rams. The hydraulic system section covers pressure checks, leak-down tests, and cylinder service and repair.
Manual Section: Hydraulic System p. 36Oil dripping around the lift rams
Heavy dripping from both sides near the lower rams points to failed cylinder seals or leaking fittings. The system contamination control section gives the hose and fitting torque specifications and procedures needed for a clean, leak-free repair.
Manual Section: System Contamination Control p. 16Loss of drive or the machine creeps
Lost drive power or creeping under load points to the hydrostatic drive. This section covers charge pressure checks, the directional and relief valve combination, the closed loop, and piston pump and drive motor troubleshooting.
Manual Section: Hydrostatic Drive System p. 54Glow plugs not working, hard cold start
A 920 that will not start in the cold with dead glow plugs points to the glow plug circuit, wiring, or a control relay. The electrical system section covers the starting and charging circuits and both the 920 and 930A wiring diagrams.
Manual Section: Electrical System p. 88Drive chain slack or brake drag
Loose drive chains or a dragging brake show up as lost drive or uneven tracking. The chain case section covers chain adjustment with the covers on or removed, chain removal and installation, and brake assembly service.
Manual Section: Chain Case p. 66Steering drifts or will not center
A loader that drifts or will not return to neutral usually needs T-bar and neutral centering adjustment. The steering controls section covers troubleshooting, T-bar adjustment and removal, and neutral centering device service and repair.
Manual Section: Steering Controls p. 28Frequently Asked Questions
Which machines does this manual cover?
It is the service manual for the Mustang 920 and 930A skid steer loaders, published under part number 008-12909, with separate general specifications for each model.
Which engines do these loaders use?
The specifications section lists the engine details for both models, which run the Yanmar 3TNA72E-S and 3TN82E diesel engines, along with fluid capacities and hydraulic settings. p. 6
Are torque specifications included?
Yes. The system contamination control section carries the standard and metric torque value specifications plus hose and fitting torque procedures used throughout the repairs. p. 16
Can I diagnose why the loader will not drive?
Yes. The hydrostatic drive system section covers charge pressure checks, the relief valve combination, the closed loop, and piston pump and drive motor troubleshooting for a machine that has lost drive. p. 54
How quickly can I access this Mustang 920, 930A manual after buying?
Instant PDF download. You get the full 97-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this Mustang 920, 930A manual?
Yes. The PDF has no DRM restrictions — print any page or section you need for your shop. Works with any standard printer.
Does this Mustang 920, 930A manual include wiring diagrams?
Yes. You'll find full electrical schematics with wire routing diagrams, connector identification, and circuit descriptions.
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