Gehl 721 Telescopic Wheel Loader Operator’s Manual(909887) – PDF DOWNLOAD

Gehl 721 Telescopic Wheel Loader Operator’s Manual(909887) – PDF DOWNLOAD

IMAGES PREVIEW OF THE MANUAL:

  
DESCRIPTION:

Gehl 721 Telescopic Wheel Loader Operator’s Manual(909887) – PDF DOWNLOAD

Introduction 1
1.1 Notes on this operation manual

• This operation manual contains important information on how to work safely, correctly and economically with the wheel loader model 721T. Therefore, it aims not only at new operators, but is also a reference for experienced ones. It helps to avoid dangerous situations, and reduce repair costs and downtimes. Furthermore, the reliability and the service life of the vehicle will be increased by following the instructions in the operation manual.
• This is why the operation manual must always be kept at hand in the vehicle. Your own safety, as well as the safety of others, depends to a great extent on how the vehicle is moved and operated. Therefore, carefully read and understand this operation manual prior to the first drive.
• This operation manual will help to familiarise yourself more easily with the vehicle, thereby enabling you to use it more safely and efficiently. General safety instructions are given in Section 2 of this operation manual. Carefully read and understand them prior to the first drive. As a rule, keep the following in mind: Prudent and careful work is the best protection against accidents! Special safety instructions with direct reference to service, function and operation of the vehicle are given right before the procedure to follow in the respective sections.
• These safety instructions must always be observed and followed. Operational safety and readiness of the vehicle do not only depend on your skill, but also on maintenance and service of the vehicle. This is why regular maintenance and service work is absolutely necessary. Extensive maintenance and repair work must always be carried out by an expert with appropriate training. Insist on using original spare parts when performing maintenance and repair work.
• This ensures operational safety and readiness of your vehicle, and maintains its value. Your dealer will be pleased to answer any further questions regarding the vehicle or the operation manual.

TABLE OF CONTENTS:

Gehl 721 Telescopic Wheel Loader Operator’s Manual(909887) – PDF DOWNLOAD

Introduction
Introduction …………………………………………………………………………………………………….. 1-1
Notes on this operation manual ……………………………………………………………………. 1-1
Vehicle overview…………………………………………………………………………………………. 1-2
Brief description ………………………………………………………………………………………….. 1-3
Fields of application …………………………………………………………………………………….. 1-4
Regulations………………………………………………………………………………………………… 1-5
Vehicle data……………………………………………………………………………………………….. 1-6
Page left intentionally blank …………………………………………………………………………. 1-7
Type labels and component numbers…………………………………………………………….. 1-8
Other signs and symbols …………………………………………………………………………….. 1-9
Safety instructions
Safety instructions ……………………………………………………………………………………………. 2-1
Identification of warnings and dangers ………………………………………………………….. 2-1
Designated use and exemption from liability …………………………………………………… 2-2
General conduct and safety instructions…………………………………………………………. 2-3
Safety instructions regarding operation ………………………………………………………….. 2-6
Safety instructions for maintenance……………………………………………………………… 2-10
Warning of special hazards ………………………………………………………………………… 2-12
Operation
Operation ……………………………………………………………………………………………………….. 3-1
Overview of cab ………………………………………………………………………………………….. 3-2
Overview of switches, levers and consoles ……………………………………………………. 3-4
Taking into service………………………………………………………………………………………. 3-6
Safety instructions ………………………………………………………………………………… 3-6
Taking the vehicle into service for the first time …………………………………………. 3-6
Checklists …………………………………………………………………………………………….. 3-7
Driving the vehicle ………………………………………………………………………………………. 3-9
Overview of control elements ………………………………………………………………… 3-9
Telltales: overview ………………………………………………………………………………. 3-15
Before starting the engine ……………………………………………………………………. 3-18
Start the engine ………………………………………………………………………………….. 3-18
Jump-starting the vehicle………………………………………………………………………. 3-21
Before moving off ………………………………………………………………………………… 3-22
Moving off …………………………………………………………………………………………… 3-26
Gear shift ……………………………………………………………………………………………. 3-27
Changing direction……………………………………………………………………………….. 3-29
Load stabiliser …………………………………………………………………………………….. 3-30
Differential lock ……………………………………………………………………………………. 3-31
Steering …………………………………………………………………………………………….. 3-31
Stopping the vehicle …………………………………………………………………………….. 3-33
Parking the vehicle ……………………………………………………………………………… 3-33
Light system ……………………………………………………………………………………….. 3-34
Signalling system…………………………………………………………………………………. 3-36
Cab heating and ventilation …………………………………………………………………… 3-37
Auxiliary heating (Not available ) ……………………………………………………………. 3-39
Washer system……………………………………………………………………………………. 3-40
Seat adjustment…………………………………………………………………………………… 3-41
Seat belt …………………………………………………………………………………………….. 3-43
Vehicle doors………………………………………………………………………………………. 3-45
Other controls ……………………………………………………………………………………… 3-46
Towing and transporting the vehicle……………………………………………………….. 3-47
Table of contents
I-2 BA 303 10 US-Gehl – Edition 1.0 * 30310bus-gehl10IVZ.fm
Table of contents
Working with the vehicle ……………………………………………………………………………. 3-50
General safety instructions …………………………………………………………………… 3-50
Load diagram ……………………………………………………………………………………… 3-50
Safe load indicator ……………………………………………………………………………….. 3-52
Control valve of the loader unit: overview………………………………………………… 3-54
Lowering the loader unit with the engine switched off ……………………………….. 3-59
Depressurising the quick couplers on the loader unit ………………………………… 3-60
Connecting pressurised quick couplers …………………………………………………… 3-61
Re-equipping the loader unit………………………………………………………………….. 3-63
Connection of electrically driven implements (option) ………………………………. 3-66
Safety feature “Hose burst valve” …………………………………………………………… 3-68
Working with standard bucket and pallet forks …………………………………………. 3-70
Troubleshooting
Troubleshooting ………………………………………………………………………………………………. 4-1
Engine trouble…………………………………………………………………………………………….. 4-2
Maintenance
Maintenance ……………………………………………………………………………………………………. 5-1
Introduction ……………………………………………………………………………………………….. 5-1
Fuel system ……………………………………………………………………………………………….. 5-1
Specific safety instructions …………………………………………………………………….. 5-1
Refuelling……………………………………………………………………………………………… 5-2
Cleaning the fuel tank ……………………………………………………………………………. 5-3
Fuel filter ………………………………………………………………………………………………. 5-4
Engine lubrication system …………………………………………………………………………….. 5-6
Checking the engine oil level ………………………………………………………………….. 5-6
Filling in engine oil …………………………………………………………………………………. 5-7
Changing the engine oil ………………………………………………………………………….. 5-8
Changing the engine oil filter cartridge ……………………………………………………… 5-9
Engine and hydraulics cooling system………………………………………………………….. 5-10
Specific safety instructions …………………………………………………………………… 5-10
Checking the coolant level…………………………………………………………………….. 5-11
Topping up the coolant …………………………………………………………………………. 5-12
Draining/replacing coolant ……………………………………………………………………. 5-13
Cleaning the outside of the cooling ribs ………………………………………………….. 5-14
Air filter ……………………………………………………………………………………………………. 5-15
V-belt ………………………………………………………………………………………………………. 5-18
Hydraulic system……………………………………………………………………………………….. 5-19
Specific safety instructions …………………………………………………………………… 5-19
Hydraulic oil level ………………………………………………………………………………… 5-20
Hydraulic oil reflux filter…………………………………………………………………………. 5-24
Changing the breather filter ………………………………………………………………….. 5-24
Hydraulic pressure lines ……………………………………………………………………….. 5-25
Gearboxes and axles ………………………………………………………………………………… 5-26
Rear axle gearbox ……………………………………………………………………………….. 5-27
Rear axle differential…………………………………………………………………………….. 5-29
Front axle differential ……………………………………………………………………………. 5-30
Front and rear axle planetary drives ……………………………………………………….. 5-31
Lubricating planetary drive bearings ………………………………………………………. 5-32
Lubricating the rear axle oscillation-type bearing …………………………………….. 5-32
Telescopic unit and loader unit ……………………………………………………………………. 5-33
Lubricating the pivots on the loader unit …………………………………………………. 5-33
Lubricating the telescopic unit ………………………………………………………………. 5-33
Adjusting the wear pads ……………………………………………………………………….. 5-34
Tyre care………………………………………………………………………………………………….. 5-3
Inspection work …………………………………………………………………………………… 5-35
Wheel change……………………………………………………………………………………… 5-36
Heating ……………………………………………………………………………………………………. 5-37
Cleaning the dust filter of the heating system ………………………………………….. 5-37
Electrical system……………………………………………………………………………………….. 5-38
Specific safety instructions …………………………………………………………………… 5-38
Service and maintenance work at regular intervals…………………………………… 5-39
Instructions concerning specific components ………………………………………….. 5-39
General maintenance work…………………………………………………………………………. 5-41
Cleaning ……………………………………………………………………………………………. 5-41
Screw connections ………………………………………………………………………………. 5-43
Pivots and hinges ……………………………………………………………………………….. 5-43
Engine fluids and lubricants ………………………………………………………………………. 5-44
Service kits ……………………………………………………………………………………………… 5-45
Proofs of maintenance ………………………………………………………………………………. 5-46
Maintenance plan (overview) ……………………………………………………………………… 5-50
Maintenance label …………………………………………………………………………………….. 5-54
Helpful information for using the spare parts list
Helpful information for using the spare parts list …………………………………………………… 6-1
Introduction ……………………………………………………………………………………………….. 6-1
Composition of spare parts list …………………………………………………………………….. 6-1
Groups ………………………………………………………………………………………………… 6-1
Group overview …………………………………………………………………………………….. 6-2
Figures…………………………………………………………………………………………………. 6-3
Number index ………………………………………………………………………………………. 6-3
Symbols and abbreviations ………………………………………………………………………….. 6-4
Description of symbols ………………………………………………………………………….. 6-4
Abbreviations………………………………………………………………………………………… 6-6
Vehicle data ………………………………………………………………………………………………. 6-7
Helpful information for ordering spare parts …………………………………………………… 6-7
Order information…………………………………………………………………………………… 6-8
Address for your spare part order ……………………………………………………………. 6-8
Specifications
Specifications ………………………………………………………………………………………………….. 7-1
Frame ………………………………………………………………………………………………………. 7-1
Engine ………………………………………………………………………………………………………. 7-1
Power train…………………………………………………………………………………………………. 7-2
Axles ………………………………………………………………………………………………………… 7-3
Brakes ……………………………………………………………………………………………………… 7-3
Steering …………………………………………………………………………………………………… 7-4
Work hydraulics …………………………………………………………………………………………. 7-4
Pilot control ………………………………………………………………………………………………. 7-4
Loader unit ……………………………………………………………………………………………….. 7-5
Weights …………………………………………………………………………………………………….. 7-5
Electrical system…………………………………………………………………………………………. 7-6
Tyres ………………………………………………………………………………………………………… 7-8
Noise levels ………………………………………………………………………………………………. 7-9
Vibration ……………………………………………………………………………………………………. 7-9
Dimensions …………………………………………………………………………………………….. 7-10
Coolant compound table ……………………………………………………………………………. 7-10
Tightening moments …………………………………………………………………………………. 7-11
General tightening torques …………………………………………………………………… 7-11
Specific tightening torques ………………………………………………………………….. 7-11
Hydraulics diagram (options) ……………………………………………………………………………. A-1
Hydraulics diagram …………………………………………………………………………………………. A-2
Legend – wiring diagram ………………………………………………………………………………….. A-4
Wiring diagram ……………………………………………………………………………………………….. A-7