This is the factory service manual for the Mustang MTL312 track loader, part number 917367, built around the Yanmar 4TNV84T diesel. The 263 page PDF is the same reference a dealer technician uses, written for disassembly and assembly, inspection, maintenance, and troubleshooting, with a searchable text layer.It is organized into safety, service data, function, disassembly and assembly, and troubleshooting sections. Service data holds the specifications, tightening torques, and the hydraulic circuit and electrical wiring diagrams, while the disassembly chapters walk through the gear pump, control valve, self level valve, pilot valve, cylinders, and travel motor step by step.Owners, independent mechanics, and restorers can download it instantly and print the pages they need, so torque figures, tension settings, and rebuild procedures for the MTL312 are on hand at the bench.
What's Inside This Mustang MTL312 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 3-12 | - |
| Service Data | 13-36 | Hydraulic Circuit Diagram, Electrical Wiring Diagram, Wire Harness Diagram |
| Function | 37-78 | Air Conditioner System |
| Gear Pump | 132-136 | - |
| Control Valve | 137-142 | - |
| Sub Valve | 143-147 | - |
| Self-Level Valve | 148-151 | - |
| Pilot Valve | 152-158 | - |
| Cylinders | 159-174 | Proportional Control Solenoid Valve |
| Travel Motor | 175-194 | - |
| Air Conditioner | 195-198 | - |
| Troubleshooting | 199-263 | Air Conditioner System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Tightening torque section | PDF page 28 | p. 28 |
| Hydraulic oil tank total amount of oil | 45 L | p. 18 |
| Hydraulic oil tank capacity | 29 L | p. 18 |
| Starting system voltage | 12 V | p. 16 |
| Starting system output | 2.3 kW | p. 16 |
| Fan belt adjustment (force) | 98 N | p. 195 |
| Fan belt adjustment (yield) | 8 mm | p. 195 |
| Crawler tension | 25 to 50 mm | p. 20 |
| Drive sproket A standard dimension | 384 mm | p. 80 |
| Drive sproket A allowable value | 374 mm | p. 80 |
| Rated engine speed | 2800 min-1 | p. 16 |
| Bucket capacity | 0.298 m3 | p. 15 |
Mustang MTL312 Common Problems This Manual Covers
Weak or one-sided track travel
Tracks that feel weak, jerky, or where one side stalls under load usually point to low hydraulic fluid, a clogged filter, or travel motor wear. The Travel motor chapter covers its disassembly and assembly, and crawler tension should be 25 to 50 mm.
Manual Section: Travel motor p. 175Slow or weak hydraulic response
Sluggish lift or bucket functions often come from a worn or sticking control valve, contaminated oil, or a restricted filter. The Control valve chapter details its disassembly, inspection, and reassembly.
Manual Section: Control valve p. 137Bucket will not hold level
A bucket that fails to self level or drifts through the range points to the self level valve or its pilot signal. The Self-level valve chapter covers the teardown and inspection needed to correct it.
Manual Section: Self-level valve p. 148Reduced hydraulic flow or pump wear
Overall loss of hydraulic speed and power across every function usually traces to a worn gear pump. The Gear pump chapter provides the disassembly, measurement, and reassembly procedure.
Manual Section: Gear pump p. 132Hard starting or no start
Poor cranking or a no start condition ties back to the starter, battery, or a fuel system restriction. The Troubleshooting section isolates the fault; the starting system runs 12 V with a 2.3 kW starter.
Manual Section: Troubleshooting p. 199Undercarriage rattle or track slack
Clanking or rattling from the undercarriage usually means track tension out of spec or worn drive components. The Service Data section gives the crawler tension figure of 25 to 50 mm and the related specifications.
Manual Section: Service Data p. 13Frequently Asked Questions
Which machine and engine does this manual cover?
It covers the Mustang MTL312 track loader, part number 917367, powered by the Yanmar 4TNV84T diesel. The PDF runs 263 pages.
Where are the torque specs?
The Service Data section holds the tightening torque tables, for example a JIS 10.9 coarse M12 x 1.75 bolt at 83.4 plus or minus 4.1 N.m and 1/2 taper thread piping joints at 88.3 plus or minus 8.8 N.m. p. 13
What is the hydraulic oil capacity and change interval?
The Service Data section lists a hydraulic oil tank capacity of 29 L, a total system amount of 45 L, and a replacement interval of every 1000 hours. p. 13
Are the wiring diagrams included?
Yes. The electrical wiring diagram and wire harness diagram are included in the service data, giving you the circuits needed to trace electrical faults. p. 32
How will I receive this Mustang MTL312 Service Manual?
It's a 263-page searchable PDF ready for immediate download. Works on any device, so you can pull it up on your phone right at the machine. No shipping, no waiting.
Can I print this Mustang MTL312 manual?
Yes. Print as many copies as you want, with no restrictions. Plenty of mechanics print just the section they need and carry it to the shop floor.
Does this Mustang MTL312 Service Manual cover the hydraulic system?
Yes. Complete hydraulic schematics are included, with flow diagrams, valve configurations, and pressure specifications.
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