Hydraulic Oil Level Gauge Flashes - Komatsu WA900-3E0 Shop Manual

K-1 Hydraulic oil level gauge flashes
Failure Indication of hydraulic oil level gauge flashes.
Related information
q
No. Cause
1 Lowered hydraulic oil level
2 Defective hydraulic oil level switch
Defective hydraulic oil level switch
3
relay
4 Defective diode
Open circuit in wiring harness
5 (wire breakage or defective con-
tact of connector)
WA900-3E0
Check set time of timer relay (see Structure and function, "Sensors").
Hydraulic oil level may be normal.
q
a If hydraulic oil level is low, check pump and valves for leakage of oil before
adding oil.
1. Turn starting switch to OFF position.
2. Disconnect CENS.
Resistance
1. Turn starting switch to OFF position.
2. Disconnect RD1.
Resistance
1. Turn starting switch to OFF position.
2. Replace RD1 with another relay.
3. Turn starting switch to ON position.
If hydraulic oil level is displayed normally, relay is defective.
1. Turn starting switch to OFF position.
2. Disconnect DA1.
a Measure with multimeter in diode range.
Continuity
1. Turn starting switch to OFF position.
2. Disconnect L18, T1, T2, T4, T7, DA1, RD1, SENS, and FS7.
Resistance
Troubleshooting of maintenance monitor system (K mode)
Procedure, measuring location, criteria and remarks
Between CENS (male) (1) and ground
Between CENS (male) (1) and ground
Between PL11 (male) (1) and (2)
Between each of PL11 (male) (1), (2) and (3)
Between DA1 (male) (2) (+) and DA1 (male) (1)
(-)
Between DA1 (male) (1) (+) and DA1 (male) (2)
(-)
Between FS7 (male) (4) and RD1 (female) (1)
Between FS7 (male) (4) and RD1 (female) (3)
Between RD1 (female) (2) and SENS (female) (1)
Between RD1 (female) (6) and T7
Between RD1 (female) (6) and DA1 (female) (1)
Between T4 and ground
Between T2 and ground
Between DA1 (female) (2) and ground
Between L18 (female) (9) and T1
K-1 Hydraulic oil level gauge flashes
When oil level
is normal:
Max. 1 z
When oil level
is low: Min.
1 Mz
200 to 400 z
Min. 1 Mz
Continuity
No continuity
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
4 0 - 7 1
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