This is the factory service manual for the Mustang MTL20 track loader, form number 917101, powered by the Isuzu AA-4JG1TPA diesel engine. Its 502 pages are organized into six chapters: General, Specifications, Machine Configuration, Hydraulic Units, Troubleshooting, and Engine.The machine configuration chapter covers the drive, travel, frame, control, hydraulic, and electrical systems. The hydraulic units chapter takes apart the HST pump, gear pump, control valve, pilot valve, travel motor, proportional control solenoid valve, and self-level valve, with dimensions and servicing standards throughout.Owners and independent mechanics can use it to diagnose a machine that runs but will not operate, trace relay and wiring faults, rebuild the hydraulic units, and service the engine. You download it as a PDF that opens on a phone, tablet, or computer, and you can print the pages you need for the shop.
What's Inside This Mustang MTL20 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 10-23 | Safety Precautions, Cautions During Disassembly & Assembly, Removal & Installation of Hydraulic Units, Piping Removal & Installation Precautions |
| Specifications | 24-41 | Names of Components, Dimensions, Specification Tables, Mass Tables, Recommended Lubricants, Servicing Standards |
| Machine Configuration | 42-94 | Drive System, Travel System, Frame, Control System, Attachments, Hydraulic System, Electrical System |
| Hydraulic Units | 95-212 | HST Pump, Gear Pump, Control Valve, Pilot Valve, Travel Motor, Proportional Control Solenoid Valve, Self-Level Valve |
| Troubleshooting | 213-244 | Overall Machine, Machine Travel, Lift Arms, Bucket, Auxiliary Hydraulics |
| Engine: General & Maintenance | 245-276 | Isuzu Aa-4JG1T General Information, Maintenance, Servicing Standards |
| Engine: Disassembly | 277-294 | Engine Removal & Installation, Disassembly Procedures |
| Engine: Inspection & Repair | 295-328 | Component Inspection, Wear Limits, Repair Procedures |
| Engine: Reassembly | 329-362 | Reassembly Procedures, Tightening Torques |
| Engine: Lubrication, Cooling & Fuel | 363-410 | Lubricating System, Cooling System, Fuel System (Injection Pump, Injectors) |
| Engine: Turbocharger & Electrical | 411-444 | Turbocharger, Glow Plugs, Starter, Alternator |
| Engine: Troubleshooting & Specs | 445-502 | Troubleshooting, Special Tool List, Repair Standards, Conversion Tables |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| M6-1 Metric Course Thread, Grade 8.8, Dry Torque | 8 Nm | p. 501 |
| Lever lock relay replacement action | Replace the lever lock relay | p. 216 |
| Hydraulic Oil Pressure - Travel | 34.3 +4.9 MPa | p. 35 |
| Rotor Coil Continuity Test | approximately 9 ohms | p. 195 |
| Machine Mass (not including operator) | 4275 kg | p. 28 |
| Rated Bucket Capacity | 0.458 m³ | p. 28 |
| Engine Total Displacement | 3059 mL | p. 29 |
| Hydraulic Tank Total System Capacity | 83 L | p. 32 |
| Fuel Tank Level Capacity | 90 L | p. 32 |
| Engine Cooling System Coolant Volume | 15 L | p. 32 |
| HST Pump Relief Valve Pressure Setting | 34.5 MPa | p. 29 |
| Travel Motor Reduction Gear Lubricant Amount | 1.1 L | p. 30 |
Mustang MTL20 Common Problems This Manual Covers
Machine runs but will not operate
A documented failure on the MTL20 is an engine that runs while the machine will not operate in any capacity, traced to bad relays in the control circuit. The troubleshooting chapter covers overall-machine diagnosis to find and confirm the fault.
Manual Section: V . TROUBLESHOOTING p. 213Weak or slow lift arms and bucket
Slow lift arms, a weak bucket, or poor auxiliary hydraulics point to worn pump components or a sticking valve. The hydraulic units chapter provides disassembly and servicing standards for the HST pump, gear pump, control valve, and self-level valve.
Manual Section: IV . HYDRAULIC UNITS p. 95No travel or reduced drive power
Loss of travel or reduced drive power can trace to hydraulic pressure loss or a travel motor fault. The troubleshooting chapter works through machine-travel symptoms so you can isolate the drive circuit.
Manual Section: V . TROUBLESHOOTING p. 213Faulty control relays disable functions
Relay failures leave the control and enable circuits dead even with the engine running. The machine configuration chapter documents the electrical system and control system so you can locate the relays and trace the wiring.
Manual Section: III . MACHINE CONFIGURATION p. 42Engine hard starting or rough running
Hard starting or rough running is addressed in the engine chapter, which covers engine removal and installation, service procedures, and tightening torques for reassembly.
Manual Section: VI . ENGINE p. 245Auxiliary hydraulics not working
Dead or weak auxiliary hydraulics can come from the control valve, pilot valve, or proportional control solenoid valve. The hydraulic units chapter covers disassembly and servicing standards for each of these components.
Manual Section: IV . HYDRAULIC UNITS p. 95Frequently Asked Questions
Which machine and engine does this manual cover?
It is the service manual for the Mustang MTL20 track loader, form number 917101, powered by the Isuzu AA-4JG1TPA diesel engine.
Where are the machine specifications?
The Specifications chapter lists component names, dimensions, mass tables, recommended lubricants, and servicing standards, including machine mass, bucket capacity, and hydraulic tank capacity. p. 24
Are torque specifications included?
Yes. The General chapter covers tightening torques and handling of seals, and the engine chapter adds engine tightening torques for reassembly. p. 10
Can I diagnose why the machine will not operate?
Yes. The Troubleshooting chapter covers the overall machine, machine travel, lift arms, bucket, and auxiliary hydraulics, which is where a run-but-will-not-operate fault such as bad relays is traced. p. 213
What format is this Mustang MTL20 manual in?
Delivered as an instant PDF download. The full 502-page searchable Service Manual is yours right after payment, ready to open on a laptop, tablet, or phone out in the shop.
Can I print this Mustang MTL20 manual?
No restrictions whatsoever. Print a single page, a full chapter, or the whole manual; the PDF ships unlocked.
Are electrical wiring diagrams included in this Mustang MTL20 Service Manual?
Yes. Full electrical schematics are included, with wire colors, connector locations, and circuit descriptions.
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