Description

GEHL SL5635, SL6635 Service Manual – Factory Specs, No Guesswork

If you’re turning wrenches on a GEHL SL5635 or SL6635, skip the aftermarket junk. This is the factory manual – 198 pages of what GEHL wrote for their own dealers. I’ve been an ASE Master for 28 years, and I’ve seen too many guys strip a hydrostat bolt or fry an ECU because they grabbed a generic spec. Don’t be that guy.

The manual starts right where it should: with Lubrication and Specifications on page 1-1. You get tire options, bucket capacities, and general specs – everything you need before you even pull a tool. The section on Safety (page 2-1) includes the Mandatory Safety Shutdown Procedure (page 2-2) that I make every apprentice recite before they touch a loader. That’s the kind of detail that keeps this manual on my bench, not in a drawer.

Specifications Page 1-1: What You Actually Get

Need the charge pressure for the hydrostatic system? It’s in the Specs chapter. Want to know which hydraulic oil weight is correct for your climate? Bucket capacities for the 6635 SXT? All listed. The manual doesn’t assume you know – it tells you. And it tells you in Imperial units, because that’s what we use in North America. I’ve got no patience for metric-only manuals that leave you converting on the fly.

Lubrication and Maintenance Intervals

The Lubrication section covers every grease point, oil type, and interval. If you’re running a fleet of SL5635s, you’ll keep one copy in the shop and one in the truck. The chapter even notes where to apply anti-seize versus thread locker – the kind of detail that separates a 100-hour rebuild from a 5000-hour machine.

Electrical System: Factory Wiring That Actually Matches

Aftermarket wiring diagrams are a gamble. I’ve seen schematics swapped pin 3 and pin 7 on a Deutz connector, costing a shop half a day of diagnostics. This manual’s Electrical System chapter is the real thing – wire colors, connector views, and load tests. If you’re chasing a no-start on the SL6635, you’ll trace it here without guessing.

Engine Service: From Tear-Down to Torque

The Engine chapter covers removal, disassembly, and reassembly. Some procedures say “reverse order,” but where safety matters – like when you’re pulling the engine out of the mainframe – the full procedure is written out. Torque values for head bolts and main bearing caps are OEM-sourced, not rounded-off approximations. Pair this with the GEHL SL5635 SL6635 1999 Engine Parts Book when you need part numbers for the rebuild.

Why This Manual Beats Aftermarket

I don’t say that lightly. I’ve used Chilton, Haynes, and digital knockoffs. They get you close – close enough to break something. This manual comes from GEHL, with the same drawings and torque specs used in the factory. The Table of Contents is indexed A to Z, and each chapter has black tabs so you can flip straight to Hydrostatic System or Hydraulic System without hunting. It’s built for a working shop, not a coffee table.

If you’ve ever rebuilt a wheel drive on an SL4635, you’ll know the difference. For the SL5635 and SL6635, the Mainframe chapter shows you exactly how to support the liftarm and access the driveline. Don’t skip the Safety chapter – I don’t care how many hours you have. If you need the parts breakdown, get the GEHL SL5635 SL6635 1999 Parts Catalog or the GEHL SL4635 SL4835 SL5635 SL6635 2005 Parts Catalog for cross-year coverage.

Need to understand the gear train? The Manual Transmission section in the Wheel Drives chapter lays out bearing preload and shim selection. And when you’re checking fluid levels, the Manual Transmission spec is right there – no flipping back and forth.

Does this manual cover the SL4635 or SL4835?

No. Only SL5635 and SL6635 Series II models.

What torque specs are included?

Engine head bolts, main bearing caps, wheel drive flange bolts, hydraulic fitting torque, and many more. All from GEHL factory documentation – not generic values.

Can I use this for a 2005 SL5635?

Yes, the SL5635 and SL6635 Series II covered 1999 through 2005 production. The manual is model-specific, not year-specific, but the powertrain and electrical remained largely unchanged. For exact part numbers, the 2005 parts catalog mentioned above is your best bet.

Is the wiring diagram in color?

The manual prints in black and white, but wire colors are labeled clearly (e.g., “BRN/ORN” for brown/orange). If you need color, you can print the PDF pages on a color printer – the original file is scanned in color for the schematics.

Access the Factory Manual and keep it where your hands can reach it. You’ll thank me when you’re torquing the final drive bolts to 250 ft-lbs and the spec is right in front of you. No second-guessing, no calls to the dealer. Just the right data, on your bench.