Kubota U20-3, Руководство по ремонту

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U20-3, U25-3 WSM Electrical system (Service section)
V -S-13
c Others
Trouble Check item Remedy Remarks
1. The machine does not
run in spite of the
machine lock lever being
released.
(1) Check the fuse (5A) for blowouts. Replace
(2) Check the lever lock solenoid coupler and switch
coupler for disconnection.
Repair or replace Fig.33
(3) Interchange the lever lock solenoid coupler and 2nd-
speed solenoid coupler.
Repair or replace Fig.34
(4) Check if a voltage is applied to the lever lock
solenoid coupler and switch coupler.
Repair or replace Fig.35, Fig.36
(5) Check the solenoid valve. Repair or replace Fig.37
(6) Check if the lever lock switch is normal. Replace Fig.38
2. The travel speed does
not change in spite of
the two-speed pedal
being pressed.
(1) Check the fuse (10A) for blowouts. Replace
(2) Check the 2nd-speed solenoid coupler and switch
coupler for disconnection.
Replace Fig.33
(3) Interchange the 2nd-speed solenoid coupler and
lever lock solenoid coupler.
Repair or replace Fig.34
(4) Check if a voltage is applied to the 2nd-speed
solenoid coupler and switch coupler.
Replace Fig.39, Fig.40
(5) Check the solenoid valve. Replace
(6) Check if the 2nd switch is normal. Replace
3. The horn does not sound
in spite of the horn
switch being pressed.
(1) Check the fuse (10A) for blowouts. Replace
(2) Check the harness from the grip (horn switch) for
breaking.
Repair or replace Fig.42
(3) Check the horn coupler and grip (horn switch)
coupler for disconnection.
Repair or replace
(4) Check if a voltage is applied to the horn terminal. Replace Fig.41, Fig.44
(5) Check if the horn switch is normal. Replace Fig.42
(6) Check if the horn is normal. Replace Fig.43
4. The working light does
not go on in spite of the
working light switch
being pressed.
(1) Check the fuse (20A) for blowouts. Replace
(2) Check the working light terminal and switch coupler
for disconnection.
Repair or replace
(3) Check if a voltage is applied to the working light
terminal.
Replace Fig.45, Fig.47
(4) Interchange the working light relay and release relay. Replace
(5) Check the lamp for blowouts.
Fig.46