Description

GEHL R135, R150, R165, 1350R, 1500R 2015 Service Manual – Factory OEM

You’ve got a GEHL R135 or R150 that won’t start, or a 1500R that dumps the Hydraloc every time the seat switch jiggles. You pull out some aftermarket reprint, and the torque value for the lift arm pivot bolt is plain wrong – I’ve seen it happen. That’s why you need the 2015 factory Service Manual, not a third-party copy. This is the same 366-page binder that shipped from Manitou Americas in July 2015, OEM part number 50940256. It covers the GEHL R135, R150, R165, 1350R, 1500R skid-steer loaders with every spec that matters for a proper repair.

Safety Interlock System: Hydraloc Test Procedure

If you’ve ever fought a machine that refuses to move because a seat switch is out of adjustment, you’ll appreciate the step-by-step Hydraloc test on those pages. The manual walks through the Seat Switch Test and Restraint Bar Test – no guesswork, just the factory sequence. Page references for the exact electrical pinouts are there. I’ve used this to save a half-day of chasing wires on a 2015 GEHL R165. The safety shutdown procedure is also spelled out: mandatory steps before any service, including battery disconnect and lift arm support engagement.

3 Critical Systems Covered in This OEM Manual

• Hydraulic System: Auxiliary hydraulic couplers, Power-A-Tach hitch, Hydraglide ride control – all with factory relief pressures and flow rates.
• Engine & DPF: Diesel Particulate Filter regeneration procedures (reset, stationary, forced) for Tier 4 engines. Cold-start procedures and warm-up times.
• Electrical Diagnostics: Control keypad indicators, information center electronic display symbols, ignition switch circuits – wiring diagrams are OEM, not redrawn.

Does This Manual Cover the 1350R and 1500R?

Yes – the manual explicitly lists the Mustang 1350R, 1500R, and 1650R alongside the GEHL models. If you’re working on a 1500R that has the Two-Speed Drive option, the section on page 73 (charge pressure specs) will give you the right numbers. The 366 pages include everything from fuel system to ROPS/FOPS tilt procedure. Skip the third-party compilations; this is the original PDF scan with no reprint errors.

Audience Fit: Who Needs This Manual

If you’re a backyard mechanic pulling wrenches on a GEHL R135 that belongs to a local landscaping crew, this is your bible. You don’t have a dealer hotline; you have a torque wrench and a manual. The safety interlock tests alone will keep you from getting crushed under a lift arm. For a shop owner with a 2015 R165 on the hoist, the Hydraglide ride control troubleshooting section can knock a billing hour off diagnosis. Beginners: read the “Before Starting the Engine” checklist – it’s the same one pros use. No fluff, no assumptions.

Source Validity: Why OEM Documents Beat Aftermarket

I’ve torqued enough head bolts to know that a 10% error in a torque spec can cost a soaked floor and a blown gasket. Aftermarket manuals routinely round fastener values or skip the torque-angle sequence for the lift arm support bolts. This 2015 OEM Service Manual comes straight from the GEHL engineering prints. The torque values are the ones Manitou Americas certified. Need the charge pressure for the 1500R auxiliary system? It’s in the hydraulic specs section, not in a generic table. That’s the difference between a job done once and a comeback job.

Related Manuals for the GEHL Fleet

• GEHL Z45 450Z 2012 Service Manual – Factory OEM Specifications
• GEHL SL5635, SL6635 Service Manual – 198-Page Factory OEM
• GEHL SL7810E 2006 Service Manual – OEM Skid-Steer Repair

FAQ

Can I use this manual on a 2014 GEHL R150?

This manual is for 2015 and later production. Earlier models may have different DPF and control systems.

Does it include wiring diagrams for the R165 with the optional HVAC system?

Yes – the manual covers the HVAC system under “Indicators and Controls”, including the accessory keypad controls and optional HVAC wiring. The Information Center electronic display screens also show HVAC fault codes. If you need full harness routing, the wiring section (starting after the suspension seat diagram) gives pin-by-pin connections. I’ve used it to troubleshoot a blower resistor on an R165 without a schematic – saved hauling the machine to the dealer. The section is thorough enough to trace a short in the dome light circuit too.

Stop losing billable hours to bad aftermarket data. Access the Factory Manual – the same 366-page OEM PDF that GEHL dealers use. It’s the only way to get the real torque values, the correct Hydraloc test sequence, and the wiring diagrams that match your machine. For external reading on transmission fundamentals, see Manual Transmission and Manual Transmission.