This Service Manual covers the 2005 Mustang ML 28 All-Wheel-Steer Loader and nothing else, 172 pages, OEM #918133. Hydraulic schematics trace the pilot control circuit, float position, and 4th control circuit; wiring diagrams give complete cable color coding, terminal descriptions, and connector pinouts for every harness in the cab and frame. There are step-by-step service procedures, troubleshooting charts with engine fault codes, system diagrams, and a fluid-and-filter schedule with exact intervals. Swap the fuel filter at 500 service hours, the hydraulic return filter at 1500. Grade 7 (8.8) cap screw torques run M4 to M30 (2 to 996 lb-ft) straight off the factory table. Bookmarked by section and keyword-searchable, it opens on any device so you reach the right spec before the next bolt turns.
What's Inside This Mustang ML 28 Manual
| System | Pages | Key Topics |
|---|---|---|
| Maintenance | 27-64 | Fluids and Lubricants, Explanation of Symbols for the Maintenance Decal, Maintenance Schedule, Maintenance Items, Refueling (Stationary Fuel Pumps), Fuel Prefilter |
| Engine | 65-76 | Specifications (Engine Type Decal), Engine Overview, Fuel Injection System, Fuel Injection Nozzle, Engine Valve Tip Clearance, Engine Cooling: Overview, Fuel System: Overview |
| Power Train | 77-94 | Description: Variable Displacement Pump a 10 Vg 28 Da, Description: Hydraulic Motor Vm 45 Ez 6, Fuel System: Overview, Measuring Points: Variable Displacement Pump |
| Axles | 95-112 | Type Decal – Axle, Drain, Fill and Check Plug, Tightening Values Lb-Ft, Screw Connections |
| Brakes | 113-118 | Overview: Brake System, Readjustment: Parking Brake (Replacing Brake Linings), Basic Setting: Cables (for Inching, – Parking Brake, For Parking Brake) |
| Steering | 119-124 | Overview – Steering Circuit, Steering Diagram, Hydraulic Circuit: Steered to the Left, Hydraulic Circuit: Steered to the Right, Hydraulic Ports on Servostat |
| Electrical System | 125-148 | Ohm's Law; Power, Measuring Equipment, Measuring Methods, Terminal Description, Cable Color Coding |
| Hydraulics | 149-166 | Hydraulics Diagram – Pilot Control, Hydraulics Diagram – Float Position, Hydraulic Circuit: Pump – Control Valve – Tank, Overview: Control Valve, Hydraulic Ports on Control Valve |
| Heating | 167-170 | Heating Circuit Overview (Heater Nozzle, Temperature Controller, Heater, Reflux, Lock Lever, Intake Filter, Feed), Notes |
| Torque Specifications | 171-172 | Unified National Thread Torque Values, Metric Coarse Thread Torque Values, Conversion Information |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| General torques for cap screws (Grade 7 (8.8)) | M4: 2 lb-ft (3 Nm) to M30: 996 lb-ft (1350 Nm) | p. 24 |
| Hydraulic system specific safety instructions | All lines carrying hydraulic oil must be depressurized prior to any maintenance and repair work. To do this: Lower all hydraulically controlled attachments to the ground. Actuate all the control levers of the hydraulic control valves several times. Apply the parking brake to prevent the machine from rolling away before you perform service and maintenance work. | p. 45 |
| Hydraulic oil return filter replacement interval | 1500 service hours (yearly) | p. 49 |
| Air filter replacement interval | 1200 service hours (yearly) | p. 42 |
| Fuel filter replacement interval | 500 service hours | p. 30 |
| V-belt tension deflection | 0.39'' (10 mm) | p. 44 |
| Coolant thermostat opening temperature | 162° - 181° F (72° - 83° C) | p. 65 |
| Radiator cap pretension | 13 psi (0.9 bar) | p. 65 |
| Engine Output | 38 hp (28 kW) at 2400 rpm | p. 16 |
| Engine Idle Speed | 1050 +/- 25 rpm | p. 16 |
| Engine Valve Tip Clearance | .008'' (0.2 mm) | p. 65 |
| Hydraulic Pump Max. Service Pressure | 5076 psi (350 bar) | p. 17 |
Mustang ML 28 Common Problems This Manual Covers
Mustang ML 28 won't move, or one side drives while the other side is stalled p. 84
Check hydraulic fluid level first; the tank holds 17 gal. (65 L), and low fluid will kill drive pressure on either side. If fluid is full, measure boost and pilot pressure against the diagnostic test values on page 84. If pressure is within spec, inspect drive chains and sprockets for wear before condemning the pump or motor.
Manual Section: Power TrainLoader arms lift slowly, stop under load, or extend unevenly with a full bucket p. 149
Confirm hydraulic oil level; the tank holds 17 gal. (65 L) and low fluid is the fastest way to lose lift pressure. Depressurize per page 45 before opening any lines. Trace flow from pump to control valve on the hydraulic schematic, page 149. Replace the return filter past 1500 service hours.
Manual Section: HydraulicsEngine overheats in heavy summer work, temperature gauge in the red zone p. 74
Test the radiator cap and check coolant level; the cap should hold 13 psi (0.9 bar) and a weak one lets the system boil early. Clean the radiator fins of packed debris. Belt deflection should read 0.39'' (10 mm) per page 44; a slipping belt robs the cooling fan. Work through the engine troubleshooting chart on page 74.
Manual Section: EngineClanking or rattling from the drivetrain under load, getting worse at full speed p. 77
Inspect drive chain tension and sprocket tooth profile before anything else; worn teeth create the clanking you hear at load. Lubricate rear axle oscillation-type bearings every 50 service hours per page 31 and check for missed intervals. Measure boost and pilot pressure at the diagnostic points on page 84 to rule out a hydrostatic fault mimicking mechanical noise.
Manual Section: Power TrainEngine won't start or cranks slowly in cold weather, glow plugs suspected p. 65
Verify fuel level; the tank holds about 16 gal. (62 L) and air in the lines prevents starting. Confirm engine valve tip clearance is 0.008'' (0.2 mm) per page 65, and that idle speed is set to 1050 ±25 rpm. Work through the no-start diagnostics in the engine troubleshooting chart at page 74 before touching the injection system.
Manual Section: EngineHydraulic functions erratic or noisy after filter change or running system low on fluid p. 45
Depressurize the system fully per page 45 before opening any connections; lower all attachments and cycle every control lever. Refill hydraulic oil to 17 gal. (65 L) and cycle the controls again to bleed trapped air. Inspect the hydraulic schematic on page 149 to trace each circuit. Max pump service pressure is 5076 psi (350 bar).
Manual Section: HydraulicsFrequently Asked Questions
What are the torque specs for the Mustang ML 28?
Page 24 lists general torque specs by screw size (M4 to M30) in lb-ft (Nm), with values like M6 at 7 lb-ft (10 Nm) for Grade 7 (8.8). Specific torques include the wheel nut at 221 ±15 lb.-ft. (300 ±20 Nm) and the track-rod end (steering) at 118 lb.-ft. (160 Nm). Page 97 illustrates detailed tightening values for axle components, such as 26 lb-ft (35 Nm) for certain connections. A full table of unified national and metric coarse thread torque specs sits on page 171.
How to check torque specs on Mustang ML 28
For torque checks, see the "General torques" and "Specific torques" sections on page 24, which list values like 221 ±15 lb.-ft. (300 ±20 Nm) for wheel nuts. Page 97 adds axle component values such as 26 lb-ft (35 Nm), and page 171 carries the full unified national and metric coarse thread table. The manual also says to "Tighten loose connections immediately" using these specified torques (page 63).
What are the replacement specifications for Hydraulic filter?
The replacement specification for the hydraulic filter is part number 209574. It should be replaced at the latest after 1500 service hours (yearly), or if the red indicator 34 on the instrument panel comes on when the hydraulic oil is at operating temperature.
What are the replacement specifications for Air filter?
The replacement specifications for the air filter include part number 209454 for the outer filter and 209455 for the inner filter. The filter cartridge (D) must be replaced if the red mark C in maintenance display B is visible, or at the latest after 1200 service hours (yearly). For dusty environments, the safety cartridge (F) should be replaced every third time maintenance work is performed, and in acidic environments, both cartridges D and F should be replaced at the latest after 300 service hours.
How quickly can I access this Mustang ML 28 manual after buying?
Instant PDF download. The full 172-page searchable Service Manual lands in your hands right after payment. Open it on a laptop, tablet, or phone in the shop.
Is this Mustang ML 28 Service Manual printable?
Yes. The PDF has no DRM restrictions, so print any page or section you need for the shop. Works with any standard printer.
Are there wiring harness diagrams in this Mustang ML 28 manual?
Included. The Mustang ML 28 Service Manual covers complete wiring harness diagrams, electrical circuits, and connector pinouts.
Document Quality
This PDF is a mixed document, featuring crisp, native digital text that allows you to search and copy content. The text quality is consistently high, making it easy to read throughout. Diagrams are a mix of sharp vector illustrations and clear raster images, with all labels remaining readable. Pages are clean, free from scan artifacts, stains, or skewed content, and includes several typical "NOTES" pages.
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