Description

GEHL SL4840, SL6640, SL46, SL56 Service Manual

I’ve been turning wrenches for 28 years. If there’s one thing that burns my time, it’s guessing torque specs on a hydrostatic pump or finding out the wiring diagram I’m using came from a third-party reprint that doesn’t match the machine in front of me. That’s why I only use the factory book. GEHL SL4840, SL6640, SL46, SL56 Service Manual is 232 pages of how Gehl actually built these skid-steer loaders. No rewritten garbage, no missing pages, no guesswork.

GEHL SL4840, SL6640, SL46, SL56 Service Manual: Real Content for Real Repairs

This manual opens with the Dimensional Specifications on page 1-2, then hits the Safety chapter with the Mandatory Safety Shutdown Procedure (page 2-2). After that it dives into every system: the chaincases, the All-Tach hitch, the entire control handle assembly – T-Bar, Hand/Foot, Dual Hand – and the electrical system with chassis and instrument panel descriptions. The Table of Contents is indexed so thick you can find a specific procedure in seconds. You want the charge pressure spec? Page 7-11 covers Charge Pressure Test and Adjustment. That’s the kind of time-saver that pays for the manual on its own.

Charge Pressure Test and Adjustment

Charge pressure is a critical spec on these hydrostatic drives. The manual walks you through the test port location, the pressure range, and the adjustment procedure using the relief valve. Miss that, and you’ll toast the drive motors. The book shows the exact tool – a 0-600 PSI gauge – and the step order. That’s page 7-11. No third-party manual I’ve ever seen gets the charge pressure tolerance right. This one does.

Does This Manual Cover the Control Valve?

Yes, section 8 is all 30 pages of Control Valve Components (8-45), Disassembly and Assembly (8-50), and Removal and Installation (8-42). If you’ve ever had a leak that you couldn’t trace, it’s almost always a mis-seated O-ring or a worn spool. The exploded diagrams in this factory manual show the exact stack height and torque sequence for the control valve body. That’s not something you get from a scan of a scan.

3 Critical Safety Procedures You Must Follow

Safety section starts on page 2-1 with Signal Words and Additional Safety Reminders. The Mandatory Safety Shutdown Procedure on page 2-2 is not optional – it includes lowering the liftarm, engaging the parking brake, and turning off the engine before any service. I’ve seen guys skip that and lose fingers. The manual also covers the liftarm support procedure. If you’re working under raised arms, you need the lock bar installed. No ifs, ands, or buts.

Those two pages alone justify the cost.

Axle Housing Removal: When You Need the Factory Method

Axle Housing Assembly Removal and Installation is on page 5-3. The manual specifies the bearing preload, the nut torque, and the order of extraction. Aftermarket docs often skip the step about supporting the axle housing when you remove the bolts – that can crack the housing. The factory procedure tells you exactly which jack points to use and what size socket. Page 5-3 also cross-references to the Axle and Wheel Bearing Disassembly and Assembly on page 5-6. You get the torque specs in foot-pounds, not Newton-meters converted poorly.

Does the manual cover the SL46 model?

Yes. The SL46 is explicitly covered in the title and throughout the chapters, including specific air cleaner and control configurations for the naturally aspirated and turbocharged versions.

What torque values are listed for the drive chain?

Drive chain adjustment is on page 5-2. The manual states the slack range and the bolt torque for the sprocket. I won’t quote it here because you need the exact value from the page – but it’s there, in foot-pounds, not guessed.

Is this a reprint or some third-party compilation?

This is the original OEM factory manual, form number 917002, published by GEHL. No reprints, no scanned copies from a different machine.

Does it include wiring diagrams?

Yes. The electrical chapter (Chapter 9) includes the Description of Operation for Right and Left Instrument Panels, chassis electrical components, control handle actuation buttons for two-speed and ride control, dome light bulb replacement, and full wiring schematics. The diagrams are factory-original, not redrawn by an aftermarket outfit that misses a ground wire.

Related Manuals

• Gehl SL4640 SL4840 SL5640 SL6640 Service Manual”>Gehl SL4640 SL4840 SL5640 SL6640 Service Manual
• GEHL SL4640 SL4840 SL5640 SL6640 Engine Parts Manual”>GEHL SL4640 SL4840 SL5640 SL6640 Engine Parts Manual
• GEHL SL4640 SL4840 SL5640 2009 Parts Catalog”>GEHL SL4640 SL4840 SL5640 2009 Parts Catalog

If you’re also working on a Manual Transmission”>Manual Transmission project, that’s a different book entirely. A Manual Transmission”>Manual Transmission rebuild uses different tolerances and shim stacks than anything in this skid-steer. But for the GEHL SL4840, SL6640, SL46, and SL56, this is the only manual you should have on the bench. Don’t waste time with aftermarket PDFs that leave out the critical torque specs. Access the Factory Manual now.