This is the Gehl SL5635 and SL6635 Series II service manual (Form 907846), a 198 page PDF for these skid loaders. It covers the machines powered by the F4M1011F and BF4M1011F diesel engines, and includes both the standard and DX high flow configurations.The manual guides assembly and disassembly, adjustment, testing, and troubleshooting across the mainframe, wheel drives, controls, hydrostatic system, hydraulic system, electrical system, and engine. You get pressure tests, charge pressure adjustment, cylinder service, and the hydraulic and electrical schematics.Specifications and torque values are listed up front, and an alphabetical service index helps you find a procedure fast. Whether you are chasing a loss of drive, weak hydraulics, or an electrical fault, the steps are written for the person doing the repair on an SL5635 or SL6635.
What's Inside This Gehl SL5635, SL6635 Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 7-8 | Engine Specifications, Tire Options, Buckets and Capacities, General Specifications, Hydraulic System Pressure, Travel Speed, Operating Weight |
| Safety | 9-17 | Signal Words, Mandatory Shutdown Procedure, Liftarm Support Device, ROPS Raising and Lowering, Relieving Hydraulic Pressure, Loader Raising and Lowering Procedures |
| Lubrication | 18-20 | Hydraulic Oil Reservoir, Crankcase Oil, Chaincases, Grease Fitting Locations |
| Mainframe | 21-42 | ROPS Removal and Installation, Seat and Seat Slide, Restraint Bar, All-Tach Attachment, Liftarm Removal and Installation, Liftarm Bushings, Liftarm Stop Adjustment, Control and Floor Covers, Fuel Level Sender, Rear Grille, Crossmember |
| Wheel Drives | 43-50 | Drive Chain Adjustment, Drive Chain Removal and Installation, Axle Housing, Axle and Wheel Bearing Disassembly, Idler Sprocket and Bearing |
| Controls | 51-94 | T-Bar Controls, Hand/Foot Controls, Dual Hand Controls, Two-Speed Controls, Control Handle Removal and Adjustment, Tracking Adjustment, Pivot Tube, Neutral Centering Device, Lift/Tilt Control and Adjustment, Auxiliary Hydraulics Cable and Actuator, Hand and Foot Throttle |
| Hydrostatic System | 95-107 | Troubleshooting, Case Drain Test, Charge Pressure Test and Adjustment, Pump Relief Valves, Hydrostatic Pump Removal and Installation, Pump Drive Coupling, Drive Motor Removal and Installation |
| Hydraulic System | 108-156 | Troubleshooting, System Pressure Test, Tilt and Lift Cylinder Tests, Self-Leveling Valve Test, Solenoid Valve Test, Oil Filter Element, Tilt and Lift Cylinder Removal, Cylinder Disassembly, Gear Pump, Self-Leveling Valve, Control Valve, High-Flow Manifold Valve, Pilot Valve, Hydraulic Schematics Sx and Dx |
| Electrical System | 157-166 | Description of Operation, Troubleshooting, Glow Control Relay, Relay Test, Seat and Restraint Bar Switches, Front and Rear Work Light Bulbs, Electrical Schematic |
| Engine | 167-181 | Troubleshooting, Oil Filter Element, Air Cleaner and Filter Element, Battery and Tray, Starter, Exhaust Assembly, Fan Belt Adjustment, Hydraulic Oil Cooler, Fan Shroud, Engine Removal and Installation |
| Index | 182-198 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Axle nut torque | 150 ft-lbs (200 N•m) | p. 48 |
| Hydrostatic pump to flywheel housing capscrew torque | 55 ft-lbs (73 N•m) | p. 106 |
| Breaker rating | 20 ampere | p. 158 |
| Engine Displacement | 178 CID (2,9 L) | p. 7 |
| Hydraulic Reservoir Capacity | 16 US gal (60,5 L) | p. 7 |
| Engine Oil Capacity | 10.5 US quarts (10 L) | p. 7 |
| Main Hydraulic System Pressure | 3000 psi (207 bar) | p. 7 |
| DX models | ||
| High-Flow Rate (Dual - DX models) | 36 gpm (136 L/min) | p. 7 |
| two-speed option models | ||
| Travel Speed - Two-Speed Option | 0 to 12.5 mph (0 to 20,1 km/h) | p. 7 |
| SL6635SXT/DXT | ||
| SAE-Rated Operating Load | 2350 lbs (1066 kg) | p. 7 |
| SL5635 Series II | ||
| Wheelbase | 42 inches (1069 millimeters) | p. 8 |
| SL6635 Series II | ||
| Wheelbase | 48 inches (1219 millimeters) | p. 8 |
Gehl SL5635, SL6635 Common Problems This Manual Covers
Sudden loss of hydraulics or drive
Owners report the machine losing all hydraulic drive, often traced to a failed coupler between the engine and the hydrostatic pumps. The Hydrostatic System section covers the pump drive coupling and pump removal and installation.
Manual Section: Hydrostatic System p. 95Dead or intermittent electrical system
A machine that seems electrically dead can be a battery disconnect switch left off or a tripped 20 amp breaker rather than a failed component. The Electrical System section includes relay tests and the electrical schematic.
Manual Section: Electrical System p. 157Weak hydraulics under load
Slow lift or tilt and poor attachment performance point to system pressure or charge pressure problems. The Hydraulic System section provides system pressure and cylinder tests to isolate the fault.
Manual Section: Hydraulic System p. 108Lift or tilt cylinder drift
Cylinders that will not hold position usually have worn rod seals letting oil bypass the piston. The Hydraulic System section documents cylinder removal, disassembly, and self leveling valve testing.
Manual Section: Hydraulic System p. 108Drive chain and axle bearing wear
Loose or worn drive chains and axle bearings cause noise and drivetrain slop on skid loaders. The Wheel Drives section covers chain adjustment, chain removal, and axle and wheel bearing service.
Manual Section: Wheel Drives p. 43Low hydrostatic charge pressure
Sluggish hydrostatic response can come from low charge pressure or worn pump relief valves. The Hydrostatic System section includes the case drain test and the charge pressure test and adjustment.
Manual Section: Hydrostatic System p. 95Frequently Asked Questions
Which models and engines does this manual cover?
It covers the Gehl SL5635 and SL6635 Series II skid loaders, including SX and DX configurations, powered by the F4M1011F and BF4M1011F diesel engines. The PDF is 198 pages.
Does it include torque specifications?
Yes. Values such as the axle housing and axle nut torques are given, and the general specifications appear in the Specifications section near the front. p. 7
Are hydraulic and electrical schematics included?
Yes. The Hydraulic System section contains the SX and DX hydraulic schematics, and the Electrical System section includes the electrical schematic. p. 108
How is the manual delivered?
You download the PDF immediately after purchase. There is no physical shipment, and you keep the file to reprint whenever needed.
How quickly can I access this manual after buying?
This is a 198-page searchable PDF, ready to download the moment you buy. It works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Are there any print restrictions on this manual?
Yes. With no DRM restrictions, you can print any page or section you need for the shop. It works with any standard printer.
Can I find hydraulic circuit diagrams in this Gehl SL5635, SL6635 manual?
Yes, this Gehl SL5635, SL6635 Service Manual includes hydraulic system diagrams, circuit schematics, and component specifications.
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