This Gehl Service Manual covers the Mustang 2066, 2076, and 2086 skid-steer loaders along with the Gehl 5640E and 6640E, all built with the Tier3 Yanmar diesel engine. It is the factory service manual (part #917292), 145 pages of assembly and disassembly, removal and installation, adjustment, testing, and troubleshooting for the components that make up this loader family.Sections walk through the mainframe, controls, hydrostatic drive, hydraulic system, electrical system, and the Yanmar 4TNV98 engine, with schematics, photographs, and line-art drawings supporting each repair. Lubrication and specification pages give the fluid capacities and service intervals you need for routine maintenance.Whether you are diagnosing weak hydraulics, servicing the drive circuit, or rebuilding a control assembly, this PDF download gives you the procedures and specs to do the work correctly on your own machine.
What's Inside This Gehl Skid Steer Range Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 2-6 | Important, Table Of Contents, Tire Options, Buckets and Capacities, Dimensional Specifications, Safety, General Information |
| Specifications | 7-8 | Dimensional Specifications |
| Safety | 9-16 | - |
| Lubrication | 17-20 | Crankcase Oil, Hydraulic Oil Reservoir, Chaincases, Cooling System Drain Procedures, Grease Fitting Locations |
| Mainframe | 21-38 | Introduction, Rollover and Falling Object - Protective Structure Components, Engine Access Cover, Chassis Components, Control Cover Components - Hand and Foot |
| Controls | 39-52 | Introduction, Lift and Tilt Components - Hand/Foot Control Models, Lift and Tilt Components - Dual Joystick and T-Bar/Joystick Control Models |
| Hydrostatic System | 53-64 | Hydrostatic System - Single-Speed Components - Dual Joystick Controls, Hydrostatic System - Single-Speed Components - T-Bar, T-Bar/Joystick and Hand/Foot |
| Hydraulic System | 65-88 | Introduction, Troubleshooting Guide, Standard Auxiliary Hydraulics - Dual Joystick, H/F and T-Bar/Joystick Controls, Standard Auxiliary Hydraulics - T-Bar Controls |
| Electrical System | 89-113 | Introduction, Operation - Right and Left Instrument Panels, Troubleshooting Guide, Chassis Electrical Components, ROPS Electrical Components |
| Engine | 114-137 | Introduction, Troubleshooting Guide, Engine Components - Yanmar 4TNV98 - 2066/76/86, Air Cleaner and Exhaust Components - 2066 |
| Back Cover | 145 | Gehl Company Information, Copyright Information, Printed in Usa |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic filter replacement condition | when the restriction indicator shows red | p. 18 |
| Hydraulic oil type | Mobil DTE 15M, or Petro-Canada Premium HVI60, or equivalent that contains anti-rust, anti-foam, and anti-oxidation additives & conforms to ISO VG46 or ISO VG48 | p. 17 |
| Hydraulic oil capacity | 16 U.S. gallons (61 L) | p. 17 |
| Engine Oil Capacity | 11.8 U.S. qts. (11,2 L) | p. 7 |
| Fuel Tank Capacity | 24 U.S. gal (91 L) | p. 7 |
| Chaincase Capacity (each) | 9 U.S. qts. (8,5 L) | p. 7 |
| Hydraulic Reservoir Capacity | 16 U.S. gal. (61 L) | p. 7 |
| Engine Coolant Capacity | 12 U.S. qts. (11,4 L) | p. 7 |
| Battery CCA | 950 CCA | p. 7 |
| Alternator Output | 95 A | p. 7 |
| Hydraulic System Pressure | 3000 psi (207 bar) | p. 7 |
Gehl Skid Steer Range Common Problems This Manual Covers
Weak or erratic hydraulic operation
Owners often report loader functions that feel slow, weak, or inconsistent, especially after warm-up. Low or aerated hydraulic oil, a clogged filter, or a restricted suction line are common causes, and the Hydraulic System troubleshooting guide walks through the checks.
Manual Section: Hydraulic System p. 65Loader will not travel or pulls to one side
A machine that will not drive in one or both directions, or that is noticeably weaker on one side, points to a drive-circuit or charge-flow fault. The Hydrostatic System section covers the single-speed and two-speed components involved.
Manual Section: Hydrostatic System p. 53Lift or tilt cylinders drift down
Lift arms or the bucket dropping unexpectedly usually trace to worn seals, valve leakage, or control misuse in the lift and tilt circuit. The Controls section details the lift and tilt components for each control configuration.
Manual Section: Controls p. 39Instrument panel and electrical faults
Dead gauges, warning lights, or intermittent function on these loaders send you to the wiring and instrument panels. The Electrical System section includes a troubleshooting guide plus chassis and ROPS electrical component coverage.
Manual Section: Electrical System p. 89Engine sluggish or hard to start
When the Yanmar diesel cranks but runs rough or loses power, fuel filtering and engine condition are the first suspects. The Engine section provides a troubleshooting guide and component breakdowns for the Yanmar 4TNV98.
Manual Section: Engine p. 114Hydraulic filter restriction
A restriction indicator showing red means the hydraulic filter has clogged and needs replacement before it starves the pump. The Lubrication section covers the hydraulic oil reservoir, filter service, and the fluids these loaders require.
Manual Section: Lubrication p. 17Frequently Asked Questions
Which machines does this manual cover?
It covers the Mustang 2066, 2076, and 2086 skid-steer loaders and the Gehl 5640E and 6640E, all with the Tier3 Yanmar engine. This is the factory Service Manual, part #917292.
What hydraulic oil and capacity does it specify?
The Lubrication section calls for Mobil DTE 15M, Petro-Canada Premium HVI60, or an equivalent ISO VG46/VG48 oil with anti-rust, anti-foam, and anti-oxidation additives, with a reservoir capacity of 16 U.S. gallons (61 L). p. 17
Does it help with electrical troubleshooting?
Yes. The Electrical System section includes a troubleshooting guide, instrument panel operation for both sides, and chassis and ROPS electrical component coverage to trace wiring and fault issues. p. 89
Which engine is covered?
The Engine section covers the Tier3 Yanmar 4TNV98 diesel used across the 2066, 2076, and 2086, with a troubleshooting guide and component details including air cleaner and exhaust parts. p. 114
How will I receive this Gehl Mustang 2066 & variants Service Manual?
This is a 145-page searchable PDF, ready to download right away. It works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Is this Gehl Mustang 2066 & variants Service Manual printable?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Can I find wiring schematics in this Gehl Mustang 2066 & variants manual?
Complete wiring diagrams are included, covering all electrical circuits, harness routing, and connector pinouts for the Gehl Mustang 2066 & variants.
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