U20-3, U25-3 WSM Electrical system (Mechanism section)
V-M-16
j. Travel hi-speed control circuit
Troubleshooting: Travel hi-speed malfunction
1. Turn the key switch to the ON position to see if 12 V is applied to terminal 2 of the travel hi-speed
switch.
2. Press the travel hi-speed switch to see if the 12 V signal comes to terminal 1.
3. Turn on and off the travel hi-speed switch and check the continuity and discontinuity.
4. Check the continuity of the travel hi-speed solenoid coil and measure its resistance.
5. If there is no problem with the above steps, it means the electrical system functions. Now go to the
hydraulic system.
6. Possible troubles with the hydraulic system include stuck solenoid spool, poorly performing pilot
pump, malfunctioning primary relief valve, stuck Hi-Lo selector spool, etc.
ACST
B
OFF
10A
21
Travel hi- speed
switch
R / G
DR
P1
P2
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