This is the Gehl SL3635 and SL3935 service manual (Form 908269), a 171 page PDF covering both skid loaders. The machines are built around the Yanmar 3TNE88 diesel, and the manual handles assembly and disassembly, installation and removal, adjustment, testing, and troubleshooting.Chapters cover the mainframe, wheel drives, controls, hydrostatic system, hydraulic system, electrical system, and engine. You get charge pressure and system pressure tests, self leveling and solenoid valve tests, cylinder service, and the drive chain and axle procedures, backed by schematics and line art.Specifications and an alphabetical index are included so you can find a value or procedure quickly. Whether you are servicing slow hydraulics, a no start, or drivetrain wear on an SL3635 or SL3935, the steps are written for the person turning the wrenches.
What's Inside This Gehl SL3635, SL3935 Manual
| System | Pages | Key Topics |
|---|---|---|
| A | 163-166 | Additional Safety Reminders 2-1 |
| M | 167 | Mainframe Chapter (Engine Access Cover Removal and Installation 4-2, Floor Cover and Kick Plate Removal and Installation 4-16, Fuel Level Sender Removal and Installation 4-19, Hitch Removal and Installation 4-9, Introduction 4-1, Liftarm Bushing Replacement 4-13, Liftarm Removal and Installation 4-10, Liftarm Stop Installation and Adjustment 4-14, Rear Grille Removal and Installation 4-20, Restraint Bar Removal and Installation 4-7, ROPS Rear Window Removal and Installation 4-5, ROPS Removal and Installation 4-2, Seat Removal and Installation 4-4, Seat Slide Replacement 4-4) |
| N | 167 | Neutral Centering Device Adjustment 6-17, Neutral Centering Device and Pump Arm Removal and Installation 6-16 |
| O | 167 | I, L |
| P | 167 | Priming Diesel Fuel System 10-9 |
| R | 167 | Radiator Removal and Installation 10-14, Rear Grille Removal and Installation 4-20, Relay Test and Operation 9-6, Relieving Hydraulic Pressure 2-6 |
| S | 168 | Safety Chapter (Additional Safety Reminders 2-1, Liftarm Support Device 2-3, Liftarm Support Device Disengagement 2-4, Liftarm Support Device Engagement 2-3, Mandatory Safety Shutdown Procedure 2-2, Relieving Hydraulic Pressure 2-6, ROPS, Lowering 2-5, Raising 2-4, Signal Words 2-1, Skid Loader Lowering Procedure 2-7, Skid Loader Raising Procedure 2-6) |
| T | 168 | Test (Charge Pressure 7-10, Hydrostatic Pump Case Drain 7-8, Lift Cylinder 8-13, Relay 9-6, Self-Leveling Valve 8-11, Solenoid Valve 8-14, System Pressure - Control Valve 8-7, Tilt Cylinder 8-9) |
| W | 169-171 | Wheel Drives Chapter (Axle Removal and Installation 5-4, Drive Chain Adjustment 5-2, Drive Chain Removal and Installation 5-3, Introduction 5-1) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Drive motor to chaincase capscrews torque | 120 ft-lbs (168 N•m) | p. 91 |
| Lift and Tilt Cylinder piston locknut torque | 225 ft-lbs (305 N•m) | p. 115 |
| Hydraulic oil filter element replacement interval | every 500 hours of operation or annually (whichever happens first) | p. 18 |
| Initial hydraulic oil filter element replacement interval for new skid loaders | 50-hour | p. 18 |
| Spool lock solenoid coil retaining nut torque | 45 in-lbs (5,1 N•m) | p. 121 |
| Hydraulic oil reservoir capacity | 8.0 US gal (30 L) | p. 17 |
| Hydraulic oil type | Mobil DUE 15M, or Pedro-Canada Premium HVI60, or equivalent which contains anti-rust, anti-foam, and anti-oxi dation additives & con forms to ISO VG46 | p. 17 |
| Engine Displacement | 100 CID (1,64 L) | p. 7 |
| Horsepower - Net | SAE 36 hp (27 kW) @ 3000 rpm | p. 7 |
| Torque - Maximum | 77 ft-lbs (104 N•m) @ 1600 rpm | p. 7 |
| Hydraulic Reservoir Capacity | 8.0 US gal (30 L) | p. 7 |
| Engine Oil Capacity | 5.0 US quarts (4,8 L) | p. 7 |
Gehl SL3635, SL3935 Common Problems This Manual Covers
Slow or intermittent lift and tilt
Lift and tilt that respond slowly or not at all often mean low hydraulic oil, trapped air, or a leaking hose or fitting. The Hydraulic System chapter covers checking oil, purging air, and inspecting the lift and tilt circuits.
Manual Section: Hydraulic System p. 93Auxiliary hydraulics will not operate
If an attachment function is dead, the restraint bar may be raised or the spool lock solenoid or its wiring may be faulty. The Electrical System chapter covers relay and solenoid testing.
Manual Section: Electrical System p. 126Overheating or power loss under load
Intake leaks, loose clamps, or cracked rubber elbows let unfiltered air in and cut engine performance. The Engine chapter covers the air cleaner, intake, and cooling components.
Manual Section: Engine p. 143Jerky hydraulics or cavitation noise
Air trapped in the hydraulic circuits or a low reservoir causes noise and jerky motion. The Hydraulic System chapter directs cycling the lift and tilt cylinders at full stroke to clear air and topping off the oil.
Manual Section: Hydraulic System p. 93Weak hydrostatic drive
Sluggish or uneven drive can come from low charge pressure or worn pump relief valves. The Hydrostatic System chapter includes the case drain test and the charge pressure test.
Manual Section: Hydrostatic System p. 77Drive chain wear and slack
Worn or loose drive chains cause drivetrain noise and lost motion. The Wheel Drives chapter covers drive chain adjustment, removal, and installation.
Manual Section: Wheel Drives p. 41Frequently Asked Questions
Which models and engine does this cover?
It is the Gehl SL3635 and SL3935 skid loader service manual, Form 908269, for machines with the Yanmar 3TNE88 diesel. The PDF is 171 pages.
Does it give the hydraulic system pressure and other specs?
Yes. Specifications such as the 2750 psi (190 bar) main hydraulic system pressure and the fluid capacities are listed in the specifications pages. p. 7
Is hydraulic troubleshooting included?
Yes. The Hydraulic System chapter includes pressure tests, cylinder and valve tests, and guidance for slow or jerky lift and tilt functions. p. 93
How is it delivered?
You download the PDF immediately after purchase. Nothing ships, and you keep the file to reprint as needed.
What do I get after purchasing this Gehl SL3635, SL3935 manual?
Checkout delivers a 171-page searchable PDF, downloadable on the spot. Open it on a laptop, tablet, or phone and take it straight to the shop floor.
Can I print specific sections of this Service Manual?
The PDF is DRM-free, so print whatever sections you want to carry out to the shop. Standard letter or A4 paper works fine.
Are electrical wiring diagrams included in this Gehl SL3635, SL3935 manual?
Yes. This manual includes complete electrical wiring diagrams, wire routing, and connector pinouts.
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