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WA900-3E0
Komatsu WA900-3E0 User Manual
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Electrical system
Sensor
WA900-3E0
Sensor
10-
2
6
Engine oil level sensor
10-
26
1. Connector
2. Bracket
3. Float
4. Switch
Function
10
-26
q
This sensor is installed on the side face of the
engine oil pan. If the
oil level drops below the
specified level, the floa
t lowers and the switch
becomes "OFF".
10-26
44
46
Table of Contents
Index and Foreword
2
Table of Contents
3
Table of Contents
4
Foreword
7
Before Reading this Manual
7
Specification Specification
10
Specification Dimension Drawing
10
Specification
10
Specifications
11
Weight Table
14
Table of Fuel, Coolant and Lubricants
16
Structure and Function
20
Cooling System and Related Devices
22
Cooling System
22
Hydraulic System
24
Power Ladder System
24
Electrical System
29
Power Ladder Controller
29
Rear View Monitor System
38
Engine Service Monitor System
41
Parking Brake Circuit
43
Sensor
45
Standard Value Table
48
Standard Value Table for Chassis
50
Standard Value Table for Electrical System
51
Testing and Adjusting
52
Inspection and Adjustment of Potentiometer
54
Testing and Adjusting
54
Ladder Position Calibration Procedure
55
Procedure for Testing Diodes
57
Troubleshooting
58
General Information on Troubleshooting
61
Classification and Procedures of Troubleshooting
61
Failure Codes Table
62
General Information on Troubleshooting
62
Fuse Locations
64
Troubleshooting by Failure Code
66
Failure Code [D1EMKA] (Disconnection of Parking Brake Interlock Relay)
66
Failure Code [D1EMKB] (Ground Fault of Parking Brake Interlock Relay)
68
Failure Code [D1EMKY] (Hot Short of Parking Brake Interlock Relay)
69
Failure Code [D1EPKA] (Disconnection of Ladder Drive Pump Relay)
70
Failure Code [D1EPKB] (Ground Fault of Ladder Drive Pump Relay)
71
Failure Code [D1EPKY] (Short Circuit of Ladder Drive Pump Relay)
72
Failure Code [D1EQKY] (Ladder Operation Alarm Relay Output Hot Short Circuit)
73
Failure Code [D1EQKZ]
74
Open Circuit, Ground Fault)
74
Failure Code [D1ERKB] (Ladder Raise Solenoid Output Ground Fault)
75
Failure Code [D1ERKZ]
76
Open Circuit, Hot Short Circuit)
76
Failure Code [D1ESKB] (Ladder Lower Solenoid Output Ground Fault)
77
Failure Code [D1ESKZ]
78
Open Circuit, Hot Short Circuit)
78
Failure Code [DBL0KR] (Power Ladder Controller CAN-NET Signal Line Open Circuit)
79
Failure Code [DBL0KT] (Non-Volatile Memory Write Error)
83
Failure Code [DBL1KK] (Power Low Error: Battery Direct)
84
Failure Code [DBL2KK] (Solenoid Power Low Error)
86
Failure Code [DDB6KZ] (Parking Brake System Abnormality)
88
Failure Code [DDDGKY] (Ladder Operation Switch Hot Short Circuit)
90
Failure Code [DDDKKY] (Ladder Raise Operation Switch Hot Short Circuit)
95
Failure Code [DDDLKY] (Ladder Lower Operation Switch Hot Short Circuit)
96
Failure Code [DK5VKX] (Ladder Angle Sensor Abnormality: out of Range)
98
Failure Code [DK5VMA] (Power Ladder System Abnormality)
100
Failure Code [DUM9KY] (Ladder Indicator Output Hot Short Circuit)
103
Failure Code [DUM9KZ] (Ladder Indicator Output Abnormality: Open Circuit, Hot Short Circuit)40
104
Failure Code [DV00KY] (Ladder Interlock Caution Output Hot Short Circuit)
105
Failure Code [DV00KZ]
106
Open Circuit, Ground Fault)
106
Failure Code [DWNLKA] (Ladder Cushion Valve Output Open Circuit)
107
Failure Code [DWNLKB] (Ladder Cushion Valve Output Ground Fault)
108
Failure Code [DWNLKY] (Ladder Cushion Valve Output Hot Short Circuit)
109
Troubleshooting of Electrical System (E-Mode)
110
Power Ladder Does Not Operate
110
Brake Oil Temperature Warning Keeps Lighting
113
Parking Brake Does Not Operate (as Emergency Brake)
115
Parking Brake Is Applied While Machine Is Traveling
119
Parking Brake Is Released as Starting Switch Is Turned to on Position
122
Troubleshooting of Hydraulic and Mechanical System (H-Mode)
124
Power Ladder Does Not Move or Its Speed Is Low
124
Fan of ADD Cooler Does Not Rotate
125
Troubleshooting of Maintenance Monitor System (K Mode)
126
Maintenance Monitor System
126
Hydraulic Oil Level Gauge Flashes
128
Troubleshooting for Machine Monitor (M-Mode)
131
Rear View Monitor Does Not Operate
131
While Clearance Lamp Is Turned On, Illuminance of Rear View Monitor Remains Dark
134
Rear View Monitor Does Not Work in Reverse-Interlock Mode
135
Illuminance of Rear View Monitor Cannot be Adjusted
137
Optional Controller Error and Real-Time Monitor Sreen Are Not Displayed on Engine Service Monitor
139
Engine Compartment Lamp Does Not Light up
141
Step Lamp Does Not Light up
144
Diagrams and Drawings
146
Hydraulic Circuit Diagram
148
Symbols Used in Hydraulic Circuit Diagram
148
Power Train Hydraulic Circuit Diagram
152
Brake, Power Ladder and Additional Cooler Hydraulic Circuit Diagram
153
Work Equipment Hydraulic Circuit Diagram
154
Electrical Circuit Diagram
155
Symbols Used in Electric Circuit Diagram
155
Electrical Circuit Diagram
156
Connector Arrangement Diagram
161
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Komatsu WA900-3E0 Specifications
General
Brand
Komatsu
Model
WA900-3E0
Category
Excavators
Language
English
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