Every procedure here points at one machine: the Gehl 1640E 2012 Skid-Steer Loader (OEM #917400), from the hydrostatic drive down to the electrical panel. The 160 pages include hydrostatic and hydraulic schematics with complete fluid routing, wiring diagrams for both standard and EU battery disconnect configurations, and 10 pages of troubleshooting logic aimed at charge pressure faults, solenoid valve failures, and drive system problems. The procedures chapter runs 70 pages: mainframe teardown, wheel drive chain adjustment, lift arm bushing replacement, cylinder disassembly, and full engine removal and installation. Wheel nuts torque to 244 N•m (180 ft.-lbs.), the hydraulic filter gets swapped every 250 hours, and the reservoir holds 7.2 US gallons. When the machine is down and the dealer quotes three days, pull the right spec up on your phone before you touch another wrench.
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
Gehl 1640E hydrostatic drive sluggish, slow to accelerate, or loses drive power entirely
Check hydraulic oil level first; the reservoir holds 7.2 US gal (27.2 L). If level is correct, test charge pressure at the pump per page 71: acceptable range is 250-300 psi (17-21 bar). Low charge pressure points to a worn pump or clogged filter. Replace the hydraulic filter at the 250-hour interval and work through the hydrostatic troubleshooting steps starting.
Manual Section: Hydrostatic System Troubleshooting GuideEngine turns over slowly or won't start, battery warning light stays on
Test the 12V battery for cold-cranking capacity: this machine requires 675 CCA minimum (Group 24). Clean both cable terminals and inspect the frame ground for corrosion and loose connections. Check whether the 25A circuit breaker on page 115 has tripped and reset it. If the battery tests strong and the breaker holds, trace the starter circuit through the wiring diagram.
Manual Section: Electrical System Troubleshooting GuideAuxiliary hydraulics slow at full throttle, bucket won't reach full operating speed
Verify the engine is at full throttle before diagnosing anything else. Check oil level in the 7.2 US gal (27.2 L) reservoir and look for external leaks if it is low. Cold-weather sluggishness usually means oil viscosity is too heavy: allow a longer warm-up or replace with ISO VG46 hydraulic oil. Check control valve relief pressure and readjust if necessary.
Manual Section: Hydraulic System Troubleshooting GuideLift arm or bucket drifts downward slowly after raising to working height p. 89
Run the tilt cylinder drift test per page 89: no more than 0.4 inches (10 mm) of movement is acceptable over 15 minutes. If the tilt cylinder passes, perform the same test on the lift cylinder. Cylinders that pass both tests point to a solenoid valve fault. Confirm all cylinder locknuts are torqued to 350 ft-lbs (474 N•m) per page 99 before reassembly.
Manual Section: Tilt Cylinder TestHydrostatic drive makes grinding or whining noise and overheats during operation p. 71
Inspect the hydraulic oil level immediately: low oil causes cavitation and rapid pump damage. Top up to the full mark; the reservoir holds 7.2 US gal (27.2 L). Purge trapped air by cycling the drive controls slowly several times. Test charge pressure per page 71: it must read 250-300 psi (17-21 bar). Pressure below that range needs dealer-level pump diagnosis.
Manual Section: Charge Pressure Test and AdjustmentFrequently Asked Questions
What are the replacement specifications for Hydraulic oil and filters?
Run Petro-Canada Premium HVI60 hydraulic oil, or an equivalent with anti-rust, anti-foam, and anti-oxidation additives that conforms to ISO VG46. The reservoir holds 7.2 US gallons (27.2 L); drain and refill it every 500 hours of operation or annually. Replace the hydraulic oil filter element every 250 hours or annually, with the first replacement at 50 hours on new skid-steer loaders.
What are the replacement specifications for Battery?
The Gehl 1640E / Mustang 2012 skid-steer loaders take a 12-V DC battery, Group 24, 675 CCA, 115 Reserve. Battery removal and installation is covered on page 141.
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.
Document Quality
This document is a scanned PDF with an OCR layer, enabling you to search and copy the full text content. The text throughout is consistently crisp and easy to read, ensuring good legibility for all instructions and information. Diagrams and illustrations are clear raster images, and their labels remain readable even when magnified. Pages are clean with no significant scan artifacts, stains, or skewed content. You will find several pages explicitly marked as 'This Page Intentionally Left Blank' which serve as filler.
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