Getting your skid steer back to factory condition requires accurate data. This 97-page Service Manual (OEM #008-12909) delivers separate wiring diagrams for the 920 and 930A, alongside full hydraulic schematics with flow charts for the lift and tilt circuits. Troubleshooting coverage spans six major systems, including steering controls, hydrostatic drive, the chain case, and electrical components. Standard and metric torque tables detail every fastener grade. For example, J.I.C. 1/4-inch hydraulic lines require 8-12 ft-lbs, while the axle sprocket retaining nut takes 100 ft-lbs initially and 30 ft-lbs final. Stop guessing at specs while the machine sits cold. Download the searchable PDF and bring the right answers straight to the loader.
What's Inside This Mustang 920, 930A Manual
| System | Pages | Key Topics |
|---|---|---|
| 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 |
| General Torque Value Specifications | Refer to pages 21-22 for general torque specifications based on screw diameter, thread pitch, and SAE/Property Grade. | p. 21 |
| 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 sits empty with visible oil dripping heavily from the lower lift cylinder rams. p. 46
Inspect the lower lift cylinders for blown seals. Rebuild the components and torque the 920 lift cylinder gland locking nuts to 215-225 ft. lbs. (292-305 Nm) as specified on page 46. Check 1/4 inch J.I.C. fittings and tighten to 8-12 Foot-Pounds on page 23 if hoses leak.
Manual Section: Hydraulic SystemLoud chain slap noise inside the case during operation or drive wheels failing to respond smoothly. p. 71
Remove the chain case covers and measure the drive chain deflection following page 71. Adjust the tensioners until you achieve exactly 1/8" (3.2 mm) of deflection with a 12-15 lbs (5.4 - 6.8 kg) pull. Torque the axle sprocket retaining nuts to 100 ft. lbs. (136 Nm) initially on page 75.
Manual Section: Chain CaseLift arms drifting downward slowly while holding a heavy load and control valves in the neutral position. p. 41
Perform a lift circuit leak down test. Raise the bucket, shut off the engine, and measure the drop. If the lift circuit movement rate exceeds 1.8 in. (45.7 mm) in 10 minutes according to page 41, inspect the cylinder seals and directional control valves for internal bypassing.
Manual Section: Hydraulic SystemFrequently Asked Questions
How do I reset a Mustang 920 or 930A skid steer?
The manual does not describe a single "reset" procedure for the entire skid steer. However, it provides "Start-Up Procedures" for the Hydrostatic Drive System after service or repair to prevent damage from dry start. These steps involve installing filters, filling the reservoir, and applying regulated air pressure (10-20 PSI maximum) to the hydraulic reservoir, as detailed on page 62.
What are the torque specs for a Mustang 920/930A service job?
The manual provides extensive torque specifications for various components. For general fasteners, refer to the "STANDARD TORQUE VALUE SPECIFICATIONS" on page 21 for SAE Grade 2, 5, and 8 fasteners, and "METRIC TORQUE VALUE SPECIFICATIONS" on page 22 for various property grades. Specific torque values are also provided for components like ROPS nuts (75 ft. lb. on page 10), lift cylinder gland locking nuts (215-225 ft. lbs. for 920/930A Lift on page 46), and drive motor lock nuts (75 ft. lbs. on page 65).
What do the error codes mean on a Mustang 920 or 930A?
The manual does not list specific alphanumeric "error codes" for the Mustang 920 or 930A. Instead, it describes various "warning lights" and "audible buzzers" in the "ELECTRICAL SYSTEM EXPLANATION" on page 88, which indicate issues such as low engine oil pressure, high engine coolant temperature, high hydraulic oil temperature, alternator problems, and engaged parking brake. These indicators signal a fault that needs to be corrected.
How do I troubleshoot hydraulic problems on a Mustang 920/930A?
To troubleshoot hydraulic problems on a Mustang 920/930A, refer to the "HYDRAULIC SYSTEM TROUBLESHOOTING" section on pages 37-38. This section outlines symptoms such as slow or jerky hydraulic action, action in only one circuit, no hydraulic action, oil overheating, sticky foot controls, or engine stalling while using hydraulics. For each symptom, possible causes are listed, including checking hydraulic fluid level, control pedal linkage, engine speed, cylinder packings, control valve, suction lines, filters, and relief valve pressure (e.g., checking lift relief psi on page 4-4).
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.
Document Quality
This is a scanned PDF document with an OCR layer, allowing you to search and copy the full text. The text throughout the manual is generally crisp and easy to read. Diagrams are a mix of sharp line drawings and clear raster images or photos, with all labels remaining readable. Pages are clean with no significant scan artifacts, stains, or skewed content, though you will find a few blank and filler pages.
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