Need the factory specs for your Mustang MTL325? This 331-page service manual (OEM #917340) covers the complete MTL325 track loader, from the HST pump and travel motor down to the proportional control solenoid valve. Open to full electrical wiring diagrams and wire harness routing in the Service Data section, then hydraulic schematics and system diagrams that include the A/C circuit. The Disassembly and Assembly chapter walks you through the HST pump, gear pump, control valve, sub valve, pilot valve, cylinders, and travel motor, while troubleshooting systematically traces faults across traveling, lift arm, bucket, and auxiliary hydraulics. Fill the system to 95L total (60L in the tank), then torque the 1-inch taper thread fittings to 196.1 ±19.6 N·m. Machine's down. Get the factory answer, not forum guesses. Bookmarked by section so you can jump straight to the right page on your tablet in the shop.
What's Inside This Mustang MTL325 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 3-12 | - |
| Service Data | 13-58 | Electrical Wiring Diagram, Wire Harness Diagram |
| Function | 59-108 | Air Conditioner System |
| HST Pump | 138-188 | - |
| Gear Pump | 189-193 | - |
| Gear Pump (High Flow) | 194-198 | - |
| Control Valve | 199-204 | - |
| Sub Valve | 205-213 | Control Valve (High Flow) |
| Pilot Valve | 214-220 | - |
| Cylinders | 221-236 | Proportional Control Solenoid Valve |
| Travel Motor | 237-258 | - |
| Troubleshooting | 259-331 | Overall Machine, Traveling, Lift Arm, Bucket, Auxiliary Hydraulics, HST Pump |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic hose fitting size 1/8 Union nut (G) torque | 9.8+4.9 N·m | p. 28 |
| Hydraulic hose fitting size 1 Taper thread (R) torque | 196.1 ±19.6 N·m | p. 28 |
| Hydraulic oil tank capacity | 60 L | p. 18 |
| Hydraulic oil total amount | 95 L | p. 18 |
| Air cleaner type | Centrifugal, Filter paper | p. 16 |
| Fuel system filter type | Filter paper | p. 16 |
| Engine cooling system capacity | 16.5 L | p. 18 |
| Engine cooling system replacement interval | Every 1000 hrs | p. 18 |
| Hydraulic oil replacement interval | Every 1000 hrs | p. 18 |
| Fan belt tension adjustment | 8 mm yield when 98N force applied | p. 302 |
| Belts tension maximum | 120 lb max | p. 108 |
| Battery type | 130E41R | p. 16 |
Mustang MTL325 Common Problems This Manual Covers
Mustang MTL325 lift arm moves slowly or won't raise under load, bucket won't tilt p. 274
Check hydraulic oil level first. Tank capacity is 60 L (page 18); if low, top off and trace active leaks at hose connections and cylinder rod seals. System travel pressure is rated at 34.3 MPa (page 20); if you're reading below that, inspect the control valve spool for wear or sticking using procedures.
Manual Section: Lift Arm Cylinder ProblemsTrack clanking or rattling noise, excessive chain sag between sprockets during travel p. 269
Inspect crawler tension immediately. Correct sag at mid-span should measure 25 to 50 mm (page 20); adjust the tension adjuster until within that range. Check sprocket tooth wear and track roller diameter against the allowable value of 208 mm on page 110. Replace worn components before returning the machine to service.
Manual Section: Traveling System MalfunctionsEngine overheats or loses power under load, temperature gauge climbs and doesn't recover p. 270
Top off the engine cooling system; capacity is 16.5 L (page 18). Flush it if the coolant looks contaminated or discolored. Clean the radiator core with compressed air to restore airflow. Belt tension matters too: correct deflection is 8 mm under 98 N of applied force at mid-span (page 302). Replace the belt if it won't hold spec.
Manual Section: Overall Machine Operation IssuesEngine won't start, cranks sluggishly in cold weather, or battery discharges overnight p. 37
Test battery voltage under load. Rated capacity is 92 A·h at 12 V (page 16); a battery that drops below spec during cranking needs replacement, not a jump start. Clean corrosion from both terminals and check cable tightness. Trace the charging circuit using the wiring diagram on page 37 to rule out alternator or relay faults.
Manual Section: Overall Machine Operation IssuesOil leaking at hydraulic hose fittings, cylinder seals, or attachment coupler connections p. 28
Identify the leak source before touching fittings. For 1-inch tapered thread fittings, torque spec is 196.1 ±19.6 N·m; for 1/8-inch pipe joints, torque to 11.8 ±1.2 N·m (page 28). Replace cracked hoses and damaged seals rather than retorquing repeatedly. Consult the hydraulic schematic on page 31 before disconnecting any pressurized lines.
Manual Section: Cylinder & Travel Motor FaultsFrequently Asked Questions
What are the torque specs for Mustang MTL325 track loader components?
Torque varies by component. On hydraulic hoses, a 1/8 inch fitting takes 9.8+4.9 N·m at the union nut and 11.8 ±1.2 N·m at the taper thread. Bolts and nuts (JIS strength category 10.9) in M6 × 1.0 coarse thread take 9.8 ±0.5 N·m at general tightening points. The full tables run across pages 28-30.
What oil should I use in a Mustang MTL325?
For the engine oil pan, use Diesel engine oil API: CF class or more, with SAE 10W-30 or SAE 15W-40 depending on air temperature. The hydraulic oil tank requires Diesel engine oil API: CD class, with SAE 10W-30 or SAE 10W-40. The travel reduction gear uses Gear oil API: GL-4 SAE 90. For specific capacities and temperature ranges, consult the Lubricant and Fuel chart on page 18.
What are the common problems or weak areas of the Mustang MTL325?
On the A/C side, the usual suspects are the belt and compressor clutch, the condenser, the refrigerant lines, hoses, and fittings, plus the metering valves. Leaks, moisture, and contamination cause trouble as well. Metal fatigue, vibration, and abnormal pressure wear these parts down until they malfunction or fail.
How quickly can I access this Mustang MTL325 manual after buying?
Instant PDF download. The full 331-page searchable Service Manual is yours the moment payment clears. Open it on a laptop, tablet, or phone right in the shop.
Can I print specific sections of this Mustang MTL325 Service Manual?
Yes, print as many copies as you want; there are no restrictions. Plenty of mechanics print only the section they need and carry it to the shop floor.
Are there hydraulic schematics in this Mustang MTL325 manual?
Full hydraulic system diagrams are included, covering circuits, valve locations, and hydraulic component specs for the Mustang MTL325.
Document Quality
This document is a scanned PDF with an OCR text layer, allowing you to search and copy text throughout the manual. The text quality is generally crisp and easy to read. Diagrams and illustrations, including detailed hydraulic and electrical wiring diagrams, are raster images but are clear and their labels are readable. Pages are clean with consistent margins and no noticeable scan artifacts or skewed content. You will find some blank pages, typically at the end of sections, which is common for manuals of this type.
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