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SL4640 SL4840 SL5640 SL6640 Skid-Steer Loaders SL4640
SL4840
SL5640
SL6640
Skid-Steer
Loaders
Operators Manual
Form No.
917001/
CP0905
English Gehl Company, in cooperation
with the American Society of
Agricultural Engineers and the
Society of Automotive Engineers, has
adopted this Safety Alert Symbol to
pinpoint precautions which, if not
properly followed, can create a safety
hazard. When you see this symbol in this
manual or on the machine itself, you are
reminded to BE ALERT! Your personal
safety is involved!
Operators must have instructions
before running the machine.
Untrained operators can cause
injury or death.
Read Operators Manual
before using machine.
CORRECT
Always fasten seatbelt
snugly. Always keep feet on
the floor/pedals when
operating loader.
CORRECT
Never use loader
without ROPS/FOPS.
Never modify the
ROPS/FOPS
structure.
WRONG
Never use the loader
to lift personnel.
WRONG
Do not use loader
around explosive dust
or gas, or where
exhaust can contact
flammable material.
WRONG Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Controls and Safety Equipment . . . . . . . . . . . . . . . . . . . 17
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Torque Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
SL4640, SL4840, SL5640 and SL6640
Skid-Steer Loader
TABLE OF CONTENTS
All-Tach, Hydraloc and Hydraglide are trademarks of Gehl Company.
Gehl and Powerview are registered trademarks of Gehl Company.
Loader Model Number
Loader Serial Number
Engine Serial Number Notes 917001/CP0905
1

CHAPTER 1
INTRODUCTION
This Operators Manual provides the owner/operator with information for operat-
ing, maintaining and servicing SL4640, SL4840, SL5640 and SL6640 skid-steer
loader models. More importantly, this manual provides an operating plan for safe
and proper use of the machine. Major points of safe operation are detailed in the
Safety chapter of this manual.
We ask that you read and understand the contents of this manual completely and
become familiar with your new machine before operating it. See your authorized
Gehl dealer if you have any questions concerning information in the manual,
require extra manuals or for information concerning the availability of manuals
in other languages.
Throughout this manual, information is provided set in italic type and introduced
by the word Note or Important. Read carefully and comply with those messages
it will improve your operating and maintenance efficiency, help avoid break-
downs and damage, and extend your machines life.
A manual storage box in the operators compartment holds the Operators Manual
and AEM Safety Manual (also available in Spanish). Please return the manuals to
this box and keep them with the unit at all times. If this machine is resold, we rec-
ommend that these manuals be given to the new owner.
The attachments and equipment available for use with this machine have a wide
variety of potential applications. Read the manual provided with the attachment
to learn how to safely maintain and operate the equipment. Be sure the machine is
suitably equipped for the type of work to be performed.
Do not use this machine for any applications or purposes other than those
described in this manual or those applicable for approved attachments. If the
machine is to be used with special attachments or equipment other than those
approved by Gehl Company, consult your Gehl dealer. Any person using non-
approved attachments or making unauthorized modifications is responsible for
the consequences.
The Gehl dealership network stands ready to provide you with any assistance you
may require, including providing genuine Gehl service parts. All service parts
should be obtained from your Gehl dealer. Provide complete information about
the part and include the model and serial numbers of your machine. Record these
numbers in the space provided on the Table of Contents page, as a handy refer-
ence.
Please be aware that Gehl strives to continuously improve its products and
reserves the right to make changes and improvements in the design and construc-
tion of any part without incurring the obligation to install such changes on any
previously delivered unit.
If this machine was purchased used, or if the owners address has changed,
please provide your Gehl dealer or Gehl Company Service Department with the
owners name and current address, along with the machine model and serial num- 2
917001/CP0905
ber. This will allow the registered owner information to be updated, so that the
owner can be notified directly in case of an important product issue. 917001/CP0905
3
Loader Identification
1. Front Work Lights
2. Handholds
3. Tilt Cylinders
4. Hitch
5. Restraint Bar
6. Lift Arm
7. Lift Cylinder
8. Tires
1
2
3
4
5
6
7
8
1. Engine Cover
2. Rear Work Lights
3. Tail Lights
4. Rear Door
5. Roll-Over/Falling Object
Protective Structure
(ROPS/FOPS)
3
3
4
1
2
5 4
917001/CP0905
Control/Indicator Symbols
Power Off
Power On
Engine Start
Battery Charge
Electrical Power
Worklight w/Flasher
Worklight
Safety Alert
Hazard Flasher
Seatbelt
Horn
Read Operators
Manual
Volume Full
Volume Half Full
Volume Empty
H-L
High Low
N
Neutral
F
Forward
R
Reverse
Parking Brake
Engine Air Filter
Engine Oil
Engine Oil Filter
Engine Oil Pressure
Fuel Filter
Engine Temperature Hydraulic System
Hydraulic Oil
Temperature
Hydraulic Oil Filter
Grease Lubrication
Point
Glow Indicator
Lamp
Diesel Fuel
Chaincase Oil
Clockwise Rotation
Counterclockwise
Rotation
Fast
Slow
Ride Control
Power Hitch
Bucket Float
Bucket Rollback
Bucket Dump
Lift Arm Lower
Lift Arm Raise
Service Hours
Lift Point
Tie-Down
Diesel Water
Separator
Engine Malfunction
Shutdown 917001/CP0905
5
CHAPTER 2
SAFETY
This safety alert symbol means Attention! Become alert! Your safety is
involved! It stresses an attitude of Heads Up for Safety and can be
found throughout this Operators Manual and on the decals on the machine.
Before operating this machine, read and study the following safety information.
For further reference on the safe operation of skid-steer loaders, Gehl Company
suggests that equipment owners obtain the Gehl Skid-Steer Loader Safety
video, which is available through Gehl dealers. In addition, be sure that everyone
who operates or works with this machine, whether family member or employee,
is familiar with these safety precautions. It is essential to have competent and
careful operators, who are not physically or mentally impaired, and who are thor-
oughly trained in the safe operation of the machine and the handling of loads. It is
recommended that the operator be capable of obtaining a valid motor vehicle
operators license.
The use of skid-steer loaders is subject to certain hazards that cannot be eliminated
by mechanical means, but only by exercising intelligence, care and common sense.
Such hazards include, but are not limited to, hillside operation, overloading, insta-
bility of the load, poor maintenance and using the equipment for a purpose for
which it is not intended or designed.
Gehl ALWAYS considers the operators safety when designing its machinery, and
guards exposed moving parts for the operators protection. However, some areas
cannot be guarded or shielded in order to assure proper operation. Furthermore,
this Operators Manual and decals on the machine warn of additional hazards and
they should be read and observed closely.
Some photographs in this manual may show doors, guards and shields open or
removed for illustrative purposes only. Be sure that all doors, guards and shields
are in their proper operating positions before starting the engine to operate the
unit.
Different applications may require optional safety equipment, such as a back-up
alarm, mirror, strobe light or an impact-resistant front door. Be sure you know the
job site hazards and equip your machine as needed.
DANGER indicates an imminently haz-
ardous situation which, if not avoided, will
result in death or serious injury.
WARNING indicates a potentially hazardous
situation which, if not avoided, could result in
death or serious injury.
CAUTION indicates a potentially hazardous
situation which, if not avoided may result in
minor or moderate injury. May also alert against unsafe practices.
DANGER
WARNI