This Gehl shop manual covers the SL6620 and SL6625 skid loaders, both powered by the Perkins 4.154 diesel engine. Across 114 pages it walks through the machine's hydrostatic drive, hydraulic system, brakes, electrical system, and engine service.You get full specifications, lubrication charts, torque values, and detailed procedures for the traction drive, control valve relief settings, hydrostatic testing, cylinders, and the starter and charging circuit. Troubleshooting tables for no-start, hydraulic loss, and charging faults are included.Whether you are an owner keeping an older machine running or an independent mechanic rebuilding one, this manual gives the adjustment, testing, and replacement steps you need. Operating capacity is 2050 lb on the SL6620 and 2250 lb on the SL6625. It downloads instantly as a PDF and prints cleanly, so you can keep just the pages you need at the machine.
What's Inside This Gehl SL6620, SL6625 Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 5-5 | General Service Manual Information, Hydraulic and Engine System Importance, Model and Serial Number Location, Orientation Definition, Engine Information, Torque Values, Torque Value Chart Information, Abbreviations |
| Specifications | 6 | General (Model & Description, Sae Operating Capacity, Sae Tip-Up Capacity, Machine Weight, Volumetric Capacities & Deliveries, Hydraulic System Filtration, Travel Speed, Controls, Brakes, ROPS, Electrical System, Tire Size & Pressure, Flotation, Overall Height, Overall Height with Operator Guard, Ground Clearance, Overall Length, Overall Length Less Bucket, Wheel Base, Dump Reach, Rollback at Ground, Dump Angle, Overall Width, W/8.25 X 15 Tires, W/12.00 X 16.5 Tires) |
| Safety | 7-8 | Safety Alert Symbol Meaning, Operator Responsibilities and Pre-Operation Checks |
| Decals | 9-14 | New Decal Application, Decal Locations |
| Lubrication | 15-16 | Oils, Chaincases, Engine Crankcase, Hydraulic Oil Reservoir, Planetary Gearcase, Greasing, Engine Oil Viscosity Index, Hydrostatic Oil Viscosity Index |
| Chassis | 17-28 | Overhead Guard, In-Seat Safety Switch-Before S.N. 2651, In-Seat Safety Switch-After S.N. 2650, Seat, Restraint Bar Switch, Lift Arm Assembly, Attachment Assembly |
| Drive | 29-46 | Brakes, Disc Brake Adjustment, Brake Pad Replacement, Brake Cables, Traction Drive T-Bar, Neutral Adjustment, Servo Adjustment, Take-Up Rods |
| Hydrostatic System | 47-66 | Introduction, Neutral, Forward, Reverse, Turns, Troubleshooting, Hydrostatic Testing, Drive Motor |
| Hydraulic System | 67-96 | Introduction, Cylinders, Hydraulic Hoses and Tubing, Electrical Components, Troubleshooting, Hydraulic Testing, Control Valve Relief Pressure, Lift and Tilt System Pump |
| Electrical System | 97-98 | Troubleshooting: Start Will Not Crank, Troubleshooting: Battery Will Not Recharge, Troubleshooting: Entire Electrical System Does Not Function |
| Engine | 99-114 | Engine Oil Filter, Air Cleaner, Battery, Starter, Engine Exhaust Assembly, Fan Belt Adjustment |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Wheel Nuts Torque | 150 ft. lbs. | p. 57 |
| Fan Belt Deflection | 1/4 inch (with 4 pound force applied) | p. 99 |
| Hydraulic System Reservoir Capacity | 18 gallon (68 liter) | p. 6 |
| Hydraulic Pump Relief Pressure | 2500 PSI (172 bar) | p. 6 |
| Engine Oil Capacity | 6-1/3 U.S. quarts (6 liters) | p. 6 |
| Engine Coolant Capacity | Approx. 12 qts. | p. 6 |
| Hydrostatic Charge Pressure | 240 PSI | p. 48 |
| Control Valve Relief Pressure | 2450 and 2550 PSI | p. 65 |
| Lubrication Interval (Daily) | Every 10 hours | p. 15 |
| Lubrication Interval (Axle Bearing) | Every 500 hours | p. 15 |
| SL6620 | ||
| Operating Capacity | 2050 lb (930 kg) | p. 6 |
| SL6625 | ||
| Operating Capacity | 2250 lb (1020 kg) | p. 6 |
Gehl SL6620, SL6625 Common Problems This Manual Covers
Loss of hydraulic power
Weak or dead loader and attachment function usually comes from low or contaminated hydraulic fluid, a clogged filter, or leaking lines. The Hydraulic System section covers the cylinders, hoses and tubing, hydraulic testing, and control valve relief pressure to trace the loss.
Manual Section: Hydraulic System p. 67Hydraulics work then fail under load
Function that fades under load often points to a slipping or broken pump drive coupling between the engine and pump, or a worn belt. The Hydrostatic System section covers the drive motor, hydrostatic testing, and neutral, forward, and reverse operation used to isolate it.
Manual Section: Hydrostatic System p. 47Machine will not crank or start
A no-crank or intermittent start can be a weak battery, loose connections, or a starter and safety circuit fault. The Electrical System section provides troubleshooting for a start that will not crank and for a system that does not function.
Manual Section: Electrical System p. 97Engine overheating
Overheating typically follows low coolant, a clogged radiator, or restricted airflow from debris. The Engine section covers the air cleaner, exhaust assembly, fan belt adjustment, and related engine service that keep cooling in order.
Manual Section: Engine p. 99Brake wear or poor holding
Worn pads or misadjusted brakes cause weak holding and drag. The Drive section covers disc brake adjustment, brake pad replacement, and the brake cables, along with the traction drive neutral and servo adjustments.
Manual Section: Drive p. 29Frequently Asked Questions
Which models and engine does this manual cover?
It covers the Gehl SL6620 and SL6625 skid loaders, both powered by the Perkins 4.154 diesel engine.
Is this a full shop manual?
Yes. Its 114 pages cover specifications, lubrication, the chassis, drive, hydrostatic and hydraulic systems, the electrical system, and the engine, with torque values and troubleshooting tables.
What is the hydraulic relief pressure?
The Hydraulic System section covers hydraulic testing and control valve relief pressure, set between 2450 and 2550 PSI, with the hydraulic pump relief at 2500 PSI (172 bar). p. 67
Does it help with a no-start problem?
Yes. The Electrical System section troubleshoots a start that will not crank, a battery that will not recharge, and an electrical system that does not function. p. 97
Is this Gehl SL6620, SL6625 Shop Manual a digital download?
Yes, it's an instant PDF download. The full 114-page searchable Shop Manual lands in your hands right after payment, ready to open on a laptop, tablet, or phone out in the shop.
Can I print this Gehl SL6620, SL6625 manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Can I find hydraulic circuit diagrams in this Gehl SL6620, SL6625 manual?
Full hydraulic system diagrams are included, covering circuits, valve locations, and hydraulic component specs for the Gehl SL6620, SL6625.
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