Need the factory service reference for your Gehl SL3640, SL3840, or SL4240 skid-steer loader? OEM #917170 runs 164 pages and aims at one thing: getting your machine back to factory spec without guesswork. You'll find hydraulic and hydrostatic schematics with full fluid routing, wiring diagrams for the chassis, instrument panel, and lighting circuits, plus 50 pages of step-by-step procedures covering liftarm R&R, hydrostatic pump work, cylinder disassembly, and drive chain service. Four troubleshooting guides break out the engine, hydraulic, hydrostatic, and electrical systems separately. Wheel nuts torque to 120 ft.-lbs. (163 N·m); the axle hub slotted locknut then backs down to a 30 ft.-lbs. (41 N·m) final spec. With your loader sitting idle, one download and a keyword search puts the answer in front of you.
What's Inside This Gehl SL3640, SL3840, SL4240 Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 7-8 | Tire Options, Buckets and Capacities, General Specifications |
| Safety | 9-16 | Signal Words, Additional Safety Reminders, Mandatory Safety Shutdown Procedure, Liftarm Support Device, Liftarm Support Device Engagement, Liftarm Support Device Disengagement |
| Lubrication | 17-20 | Hydraulic Oil Reservoir, Crankcase Oil, Hydraulic Oil Tank Drain Procedure, Chaincases, Chaincase Oil Change Procedure, Grease Fitting Locations, Cooling System Drain Procedure |
| Mainframe | 21-40 | Introduction, Engine Access Cover Removal and Installation, Rollover Protective Structure Removal and Installation, Seat Removal and Installation, Seat Slide Replacement |
| Wheel Drives | 41-46 | Introduction, Drive Chain Adjustment, Drive Chain Removal and Installation, Axle Removal and Installation |
| Controls | 47-68 | Introduction, Control Handle Removal and Installation, Control Handle Position and Tracking Adjustment, Dual Control Weldment Removal and Installation - T-Bar Controls |
| Hydrostatic System | 69-80 | Introduction, Troubleshooting Guide, Charge Pressure Test and Adjustment, Hydrostatic Pump Relief Valves, Drive Motor Hot Oil Shuttle Valve |
| Hydraulic System | 81-112 | Introduction, Troubleshooting Guide, System Pressure Test - Control Valve, Tilt Cylinder Test, Self-Leveling Valve Test, Self-Leveling Valve Adjustment, Lift Cylinder Test |
| Electrical System | 113-132 | Description of Operation, Troubleshooting Guide, Relay Test and Operation, Electrical Circuits, Seat Switch Removal and Installation, Restraint Bar Switch Removal and Installation |
| Engine | 133-154 | Introduction, Troubleshooting Guide, Engine Oil Filter Element Removal and Installation, Air Cleaner Assembly Removal and Installation, Air Filter Element Removal and Installation |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Wheel nut torque | 120 ft.-lbs. (163 N•m) | p. 43 |
| Axle hub slotted locknut torque (initial) | 100 ft.-lbs. (136 N•m) | p. 45 |
| Solenoid valve coil retaining nut maximum torque | 45 in.-lbs. (5,1 N•m) | p. 109 |
| Hydrostatic pump arm capscrew torque | 30 ft.-lbs. (40 N•m) | p. 72 |
| Auxiliary hydraulics screw/cap and washer/lock torque | 30 ft./lbs. | p. 97 |
| Hydraulic oil filter element replacement interval (initial) | 50 hours | p. 18 |
| Hydraulic oil filter element replacement interval (regular) | 500 hours | p. 18 |
| Hydraulic oil viscosity (too high/heavy) | Allow longer warm-up or replace oil with the proper viscosity oil. | p. 71 |
| Low engine speed | Operate engine at higher speed. | p. 84 |
| Hydrostatic drive overheating causes | Drive system overloaded continuously; Lift, tilt or auxiliary system overloaded continuously; Drive motor(s) or hydrostatic pump(s) have internal damage or leakage; Oil cooler fins are plugged with debris; Loader being operated in a high temperature area with no air circulation. | p. 72 |
| Hydrostatic (drive) system noisy causes | Hydraulic oil viscosity is too high; Air in hydraulic system. | p. 71 |
| Engine Oil Capacity | 7.6 US qts. (7,2 L) | p. 7 |
Gehl SL3640, SL3840, SL4240 Common Problems This Manual Covers
Gehl SL3640 lift arms will not raise or hold position during normal operation p. 109
Inspect the lift solenoid valve connections. Tighten the solenoid valve coil retaining nut to a maximum torque of 45 in.-lbs. (5.1 N•m) as detailed on page 109. Test the control valve spool and verify main hydraulic system pressure reaches 2750 psi (190 bar).
Manual Section: Hydraulic SystemLoader auxiliary hydraulic functions operate slowly or feel extremely weak until the machine warms up p. 7
Check the hydraulic reservoir capacity on page 7; it should hold 8.0 US gal. (30 L). Drain the heavy-viscosity fluid, refill with the correct weight oil, then run the engine at higher speed and confirm the filter isn't clogged.
Manual Section: Hydraulic SystemHydraulic oil level repeatedly drops and the drive system runs unusually noisy and hot p. 83
Trace all external hoses and tube connections for leaks. Work through the troubleshooting steps on page 83 to find air ingress points. Replace the hydraulic oil filter element and hand tighten until the gasket contacts the filter head, then turn 3/4 turn as shown on page 96.
Manual Section: Hydraulic SystemAxle hub feels loose or wheel studs frequently back out during aggressive turning p. 42
Torque the wheel nuts to 120 ft.-lbs. (163 N•m) following the instructions on page 42. Set the initial axle hub slotted locknut torque to 100 ft.-lbs. (136 N•m) before applying the final torque. Check the drive chain tension while you're there.
Manual Section: Wheel DrivesFrequently Asked Questions
How to reset a Gehl SL3640/SL3840/SL4240 service light or fault light?
When a fault light comes on from a tripped circuit breaker, pull up the wiring diagram and check that circuit for pinched wires or faulty connections before you reset the breaker. With 15 ampere breakers tripped, clear the underlying trouble first, then reset.
How to reset a Gehl skid steer hydraulic pressure or control system after a shutdown?
Any time you remove or replace parts of the lift and tilt system or hydrostatic drive, prime the hydraulic system first. Work the liftarm (NO LOAD) slowly up and down for several minutes, or drive the loader slowly forward and back until the air noise stops. Then check for hydraulic oil leaks and fill the reservoir to the FULL level.
What is the torque spec for Gehl SL3640/SL3840/SL4240 wheel nuts or lug nuts?
Wheel nuts (lug nuts) on the SL3640/SL3840/SL4240 loaders torque to 120 ft.-lbs. (163 N•m). Set them to that spec whenever you reinstall the wheels and tires after service.
What is the torque spec for Gehl SL3640/SL3840/SL4240 hydraulic hose fittings or drive motor bolts?
The four capscrews holding the drive motor to the chaincase take Loctite 242 and torque to 120 ft.-lbs. (168 N•m). Auxiliary hydraulic hose fittings get Loctite 242 as well, torqued to 30 ft.-lbs.
Is this Gehl SL3640, SL3840, SL4240 Service Manual a digital download?
A 164-page Service Manual in searchable PDF, ready the moment checkout completes. Open it on a computer, tablet, or phone with no shipping wait.
Can I print specific sections of this Gehl SL3640, SL3840, SL4240 manual?
Yes. The PDF carries no DRM, so you can print any page or section you need for the shop on any standard printer.
Does this Gehl SL3640, SL3840, SL4240 manual include wiring diagrams?
Included. The Gehl SL3640, SL3840, SL4240 Service Manual covers complete wiring harness diagrams, electrical circuits, and connector pinouts.
Document Quality
This document is a scanned PDF with an optical character recognition (OCR) layer, allowing you to search and copy the full text. The text is generally crisp and readable, although some larger headings show minor pixelation typical of scanned material. Diagrams and illustrations are primarily raster images or photos, with labels that are readable upon closer inspection. The pages are clean with no significant scan artifacts or skewed content, but please note there are several intentionally blank 'NOTES' pages and some completely blank pages included.
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