7 – 30 Repair manual SWE100, 120, 120L, 120S, 140, 140L, 200D © BT
Troubleshooting
Troubleshooting chart
T code Valid from serial no. Date Order no.
841×842×843 6061850- 2012-08-30 258946-120
Cont'd. Pump motor [M3] does not work:
Symptom Influencing elements Possible cause/Remedy
Pump motor [M3] voltage/
current normal
Mechanical fault in the pump Replace the hydraulic unit
No current or voltage through/
across the pump motor [M3]
Damaged wiring or
connections in the pump
motor [M3]
Check the wiring harness for
interruptions or short-circuits to
other electric components
Voltage across the pump motor
[M3], but no current through it
Open circuit in the pump
motor [M3]
Replace the hydraulic unit
Cont'd. The proportional valve [Q4] for lowering the forks does not open:
Symptom Influencing elements Possible cause/Remedy
The proportional valve's [Q4]
current/voltage is normal
Mechanical fault in the
proportional valve [Q4]
Replace the hydraulic unit
No or low current/voltage
through/across the
proportional valve's coil [Q4]
Damage to the proportional
valve's [Q4] wiring harness or
connections
Check the wiring harness for
interruptions or short-circuits to
other electric components
Defective tiller arm Hall sensor
for fork lowering
Replace logic card [A5]
Transistor regulator [T1], output
108 “OUT.LOWER VALVE”
defective
Replace the transistor regulator
[T1]
Transistor regulator [T1], output
82 “OUT. +24 V HIGH SIDE
DRIVER” defective
Se the troubleshooting chart
Truck cannot be driven
Voltage across the
proportional valve's coil [Q4],
but no current through it
Break in the proportional valve's
coil [Q4]
Replace the hydraulic unit
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