This Gehl service manual covers the 1640E skid-steer loader and its Mustang badged twin, the 2012, both powered by the Yanmar 3TNV82A diesel. Form number 917400, it runs 160 pages and is written for the person doing the actual repair: assembly and disassembly, removal and installation, adjustment, testing, and troubleshooting of the components that make up these machines.Coverage moves through specifications, safety, lubrication and service intervals, the mainframe, wheel drives, controls, the hydrostatic and hydraulic systems, electrical, and the engine. Schematics, photographs, and line drawings support each procedure.You get the reference values a job needs, such as hydraulic system pressure, reservoir capacity, axle housing and lift cylinder torque figures, charge pressure test ranges, and fan belt deflection. For owners and independent mechanics, it turns a vague symptom into a traceable fault on a 1640E or Mustang 2012.
What's Inside This Gehl 1640E, 2012 Manual
| System | Pages | Key Topics |
|---|---|---|
| This Page Intentionally Left Blank | - | - |
| Troubleshooting Guide | - | Hydrostatic/Hydraulic Schematic |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Wheel nut torque | 180 ft.-lbs. (244 N•m) | p. 44 |
| Hydraulic oil capacity | 7.2 US gal. (27,2 L) | p. 7 |
| Hydraulic oil type | Petro-Canada Premium HVI60, or equivalent that contains anti-rust, anti-foam, and anti-oxidation additives and conforms to ISO VG46 | p. 15 |
| Battery voltage | 12-V DC | p. 7 |
| Battery group | Group 24 | p. 7 |
| Circuit breaker (1) | 15 A | p. 115 |
| Circuit breaker (2) | 25 A | p. 115 |
| Control valve end cover hex nuts torque | 22 lbf-ft (30 N•m) | p. 109 |
| Remedy for hydraulic oil viscosity too heavy | Allow longer warm-up or replace existing oil with proper viscosity oil. | p. 112 |
| Remedy for hydraulic oil level low | Check oil level in reservoir. If oil is low, check for an external leak. Repair and add oil. | p. 112 |
| Engine Displacement | 81.2 CID (1.33 L) | p. 7 |
| Rated Operating Capacity | 850 lbs (386 kg) | p. 7 |
Gehl 1640E, 2012 Common Problems This Manual Covers
Weak or sluggish hydrostatic drive
Owners report a drive that feels weak, slow, or inconsistent, often from air in the system or low charge pressure. The Hydrostatic System coverage is where this behavior is diagnosed on the 1640E.
Manual Section: Hydrostatic SystemAuxiliary hydraulics run slow
Auxiliary functions can run slowly unless engine speed is raised or the oil is warmed up. The Hydraulic System coverage addresses low oil level, control valve relief pressure, and viscosity that is too heavy.
Manual Section: Hydraulic SystemBattery and electrical faults
Electrical trouble often means repeated checks of the battery, cables, breakers, and wiring before the machine runs normally. The Electrical System coverage documents the circuit breakers and wiring to trace these faults.
Manual Section: Electrical SystemPoor implement performance after warm-up
Hydraulics that feel weak after warm-up or under load usually trace to low oil level or oil that is too thick. The Lubrication section specifies the correct hydraulic oil type and change intervals.
Manual Section: Lubrication p. 15Air intake leaks cause running problems
Cracked intake tubes, elbows, or loose clamps let unmetered air in and create running and maintenance problems. The Engine coverage is where intake and engine service is handled.
Manual Section: EngineDrive chain and axle wear
Skid steer wheel drives rely on drive chains and axle bearings that stretch and wear over hours of use. The Wheel Drives coverage includes chain adjustment and axle housing and bearing service.
Manual Section: Wheel DrivesFrequently Asked Questions
Which machines does this manual cover?
It covers the Gehl 1640E and the Mustang 2012 skid-steer loaders, which share this manual, both powered by the Yanmar 3TNV82A diesel. The manual is form number 917400 and runs 160 pages.
What specifications are included?
The Specifications section lists key figures such as engine displacement, rated operating capacity, hydraulic reservoir capacity, and hydraulic system pressure for the 1640E and Mustang 2012. p. 7
How often should the hydraulic oil filter be replaced?
The Lubrication section gives the hydraulic oil filter element replacement interval as 250 hours or annually, along with other service intervals like the 500 hour chaincase oil change. p. 15
Does it help diagnose weak hydraulic or drive performance?
Yes. The Hydrostatic System and Hydraulic System coverage includes troubleshooting for weak drive, air in the system, low charge pressure, and slow auxiliary functions, so you can trace the cause rather than guess.
What do I get after purchasing this Gehl 1640E, 2012 manual?
A 160-page searchable PDF, ready to download right away. It opens on any device, so you can pull it up on your phone while you're under the hood. No shipping, no waiting.
Is this Gehl 1640E, 2012 Service Manual printable?
Yes. There's no DRM or copy protection, so print the entire manual or only the pages you need. Any home or office printer handles it.
Does this Gehl 1640E, 2012 Service Manual cover the hydraulic system?
Yes. The manual includes full hydraulic system diagrams covering circuits, valve locations, and component specs for the Gehl 1640E, 2012.
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