SHANDONG LINGONG Wheel Loader Service Manual
This document provides a detailed guide to maintaining all the electrical components of SHANDONG LINGONG Wheel Loader. It covers a wide range of topics, including the power system, instrument system, automatic reset system, lighting system, and more.
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Service Manual
Maintenance of Wheel Loader
Electrical Equipment
SHANDONG LINGONG CONSTRUCTION MACHINERY CO.，
LTD
Maintenance of Wheel Loader
Electrical Equipment
SHANDONG LINGONG CONSTRUCTION MACHINERY CO.，
LTD
Maintenance Manual of Loader Electrical Equipment
2
Maintenance of Wheel Loader
Electrical Equipment
SHANDONG LINGONG CONSTRUCTION
MACHINERY CO.，LTD
Address: Lingong Industry Park, Linyi Economic
Development Zone, Shandong, china
Tel：+86 539 8785597
Fax: +86 539 8785618
Email: [email protected]
Website: http://www.sdlg.cn
2
Maintenance of Wheel Loader
Electrical Equipment
SHANDONG LINGONG CONSTRUCTION
MACHINERY CO.，LTD
Address: Lingong Industry Park, Linyi Economic
Development Zone, Shandong, china
Tel：+86 539 8785597
Fax: +86 539 8785618
Email: [email protected]
Website: http://www.sdlg.cn
Maintenance Manual of Loader Electrical Equipment
3
Service Manual
Concise Guide
All reasonable steps have been taken to ensure that this publication is
correct and complete, but should any user be in doubt about any detail,
clarification may be sought from Shandong Lingong construction
machinery Co. Ltd. or their accredited representative. The information in
this document is subject to change without notice and should not be
construed as commitment by Shandong Lingong construction machinery
Co. Ltd. Shandong Lingong construction machinery Co. Ltd accepts no
responsibility for any errors that may appear in this document.
Shandong Lingong construction machinery Co. Ltd, P. R. China
All rights reserved. The contents of this publication may not be
reproduced in any form, or communicated to a third part without prior
written permission of Shandong Lingong construction machinery Co. Ltd.
3
Service Manual
Concise Guide
All reasonable steps have been taken to ensure that this publication is
correct and complete, but should any user be in doubt about any detail,
clarification may be sought from Shandong Lingong construction
machinery Co. Ltd. or their accredited representative. The information in
this document is subject to change without notice and should not be
construed as commitment by Shandong Lingong construction machinery
Co. Ltd. Shandong Lingong construction machinery Co. Ltd accepts no
responsibility for any errors that may appear in this document.
Shandong Lingong construction machinery Co. Ltd, P. R. China
All rights reserved. The contents of this publication may not be
reproduced in any form, or communicated to a third part without prior
written permission of Shandong Lingong construction machinery Co. Ltd.
Maintenance Manual of Loader Electrical Equipment
4
CHAPTER Ⅰ POINTS FOR ATTENTION AND BASIC INFORMATION IN
MAINTENANCE OF LOADER ELETRICAL EQUIPMENT·······················································6
1.1 Operating specification and points for attention in maintenance of electrical system ········6
1.2 The using method of digital multimeter ············································································8
1.3 The basic circuit knowledge of engineering machinery·····················································9
1.4 Points for attention and marginal data in maintenance of electrical appliance ·················12
CHAPTER Ⅱ THE PRINCIPLE OF POWER SYSTEM···························································27
2.1 The explanation of principle ···························································································27
2.2 The introduction of main components·············································································29
2.2.1 Electric lock ·········································································································29
2.2.2 Fuse······················································································································30
2.2.3 Relay····················································································································31
2.2.3.1 Intermediate relay (JD2914) ······································································31
2.2.3.2 Battery relay ······························································································32
2.2.3.3 Starting relay and flameout relay ·······························································33
2.2.4 Flameout electromagnet (only part of vehicle type)··············································34
2.2.5 Generator ·············································································································35
2.2.5.1 The principle of generator··········································································35
2.2.5.2 The connection method of Weichai generator used in LG953 ····················37
2.2.5.3 The method to judge whether the generator generates electricity normally
and treatment measures ·························································································37
2.2.6 Starting motor ······································································································38
2.2.7 Storage battery ·····································································································41
2.2.8 Power switch········································································································42
2.3 Example for maintenance of system common faults ·······················································43
2.3.1 Maintenance of power system common faults——Whole vehicle no electric ······43
2.3.2 Maintenance of power system common faults——Turn off electric lock, but
engine doesn’t stop and whole vehicle still has electricity·············································44
2.3.3 Maintenance of power system common faults——10A electric fuse is burn down
frequently······················································································································44
2.3.4 Analysis for fault in starting whole vehicle···························································44
CHAPTER Ⅲ INSTRUMENT SYSTEM ··················································································46
3.1 Schematic diagram of instrument system ········································································46
3.2 Explanation of main parts ·······························································································46
3.2.1 Instrument panel assembly ···················································································46
3.2.2 Temperature sensor ······························································································47
3.2.3 Braking barometer································································································47
3.2.4 Fuel level sensor···································································································48
3.2.5 Alarm-pressure switch··························································································48
3.3 Example for maintenance of system common faults ·······················································48
3.3.1 Abnormal indication of thermometer····································································48
3.3.2 Abnormal indication of fuel level ·········································································48
CHAPTER Ⅳ AUTOMATIC RESET SYSTEM········································································50
4.1 Schematic diagram··········································································································50
4
CHAPTER Ⅰ POINTS FOR ATTENTION AND BASIC INFORMATION IN
MAINTENANCE OF LOADER ELETRICAL EQUIPMENT·······················································6
1.1 Operating specification and points for attention in maintenance of electrical system ········6
1.2 The using method of digital multimeter ············································································8
1.3 The basic circuit knowledge of engineering machinery·····················································9
1.4 Points for attention and marginal data in maintenance of electrical appliance ·················12
CHAPTER Ⅱ THE PRINCIPLE OF POWER SYSTEM···························································27
2.1 The explanation of principle ···························································································27
2.2 The introduction of main components·············································································29
2.2.1 Electric lock ·········································································································29
2.2.2 Fuse······················································································································30
2.2.3 Relay····················································································································31
2.2.3.1 Intermediate relay (JD2914) ······································································31
2.2.3.2 Battery relay ······························································································32
2.2.3.3 Starting relay and flameout relay ·······························································33
2.2.4 Flameout electromagnet (only part of vehicle type)··············································34
2.2.5 Generator ·············································································································35
2.2.5.1 The principle of generator··········································································35
2.2.5.2 The connection method of Weichai generator used in LG953 ····················37
2.2.5.3 The method to judge whether the generator generates electricity normally
and treatment measures ·························································································37
2.2.6 Starting motor ······································································································38
2.2.7 Storage battery ·····································································································41
2.2.8 Power switch········································································································42
2.3 Example for maintenance of system common faults ·······················································43
2.3.1 Maintenance of power system common faults——Whole vehicle no electric ······43
2.3.2 Maintenance of power system common faults——Turn off electric lock, but
engine doesn’t stop and whole vehicle still has electricity·············································44
2.3.3 Maintenance of power system common faults——10A electric fuse is burn down
frequently······················································································································44
2.3.4 Analysis for fault in starting whole vehicle···························································44
CHAPTER Ⅲ INSTRUMENT SYSTEM ··················································································46
3.1 Schematic diagram of instrument system ········································································46
3.2 Explanation of main parts ·······························································································46
3.2.1 Instrument panel assembly ···················································································46
3.2.2 Temperature sensor ······························································································47
3.2.3 Braking barometer································································································47
3.2.4 Fuel level sensor···································································································48
3.2.5 Alarm-pressure switch··························································································48
3.3 Example for maintenance of system common faults ·······················································48
3.3.1 Abnormal indication of thermometer····································································48
3.3.2 Abnormal indication of fuel level ·········································································48
CHAPTER Ⅳ AUTOMATIC RESET SYSTEM········································································50
4.1 Schematic diagram··········································································································50
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Key Features
- Power System Maintenance
- Instrument System Maintenance
- Automatic Reset System Maintenance
- Lighting System Maintenance
- Backing Vehicle Alarming System Maintenance
- Wiper and Cleaner System Maintenance
- Electric Horn System Maintenance
- Standby Socket System Maintenance
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Frequently Answers and Questions
What is the nominal voltage in vehicle or engineering machinery?
The nominal voltage in vehicle or engineering machinery is mostly 12V or 24V, which is usually distinguished like this: Gasoline vehicle applies 12V electrical system, but diesel vehicle applies 24V electrical system. All of engineering machinery use diesel vehicle, so the electrical system is 24V.
What is the function of the neutral gear locking switch?
In the condition of neutral gear, put the neutral gear locking switch to the position of “N”, so the handle can’t be put back or forth and locked in the position of neutral gear. Put the locking switch in the position of “D” to release the neutral gear locking. Using the switch can prevent misoperation.
What is the purpose of the braking and out of shifting function?
When driver steps on the foot braking pedal or puts down the emergency braking button, electronic control box detects the signal and then control the speed change operating valve to cut off the power of transmission. Brake at the same time cut off the power output of transmission utilization of braking and out of shifting function to improve the efficiency of braking. Meanwhile, protect the transmission and transmission system and also increase the utilization ratio of engine and work efficiency of working devices.
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