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XLB-4319
4-20
4-7 TROUBLESHOOTING
Table 4-3. Troubleshooting Chart
Problem Cause Correction
a. Emergency stop engaged (pushed in).
b. Battery charge is low.
c. Battery ground or in-series cable
loose.
d. Main circuit breaker tripped or
switched off.
a. Rotate emergency stop buttons clock-
wise to disengage.
b. Check charge level. Recharge battery
if needed.
c. Check for and repair loose battery
connections or ground fault.
d. Reset main circuit breaker inside
ground control panel.
a. Main disconnect unplugged.
b. Fuse F2 burned out. Fuse is mounted
on front inner wall of boom pivot
weldment, in series with the positive
battery cable.
c. Motor contactor failed.
d. Pump motor failed.
a. Plug in main disconnect.
b. Correct cause of short circuit and
replace fuse.
c. Replace motor contactor.
d. Check pump motor operation; repair
or replace motor if faulty.
1. Engine or motor will not
start.
DC model only
Gas model only
a. Engine key switch in wrong position.
b. Fuel tank empty.
c. Engine oil level low.
d. Spark plug fouled or damaged.
e. Fuse F2 burned out. Fuse is mounted
inside engine key switch housing.
f. Starter relay or starter motor failed.
a. Turn key switch to run position.
b. Refill fuel tank.
c. Check/add engine oil.
d. Check/replace spark plug.
e. Correct cause of short circuit and
replace fuse.
f. Replace failed starter relay or motor.
a. Basket/ground key switch in wrong
position.
b. Hydraulic oil level low.
c. Boom down limit switch or switch
wiring failed.
d. Hydraulic gear pump failed.
a. Turn key switch to ground position.
b. Check hydraulic oil level in reservoir.
Add oil as needed.
c. Check boom down limit switch and
wiring operation per paragraph 4-6.
d. Check pump; replace if hot to touch.
a. Boom enable valve SV1 faulty (stick-
ing open) (see item 4, Figure 6-19).
a. Repair or replace faulty valve.
2. Pump motor runs, but out-
riggers will not extend.
DC model only
Gas model only
a. Outrigger enable valve solenoid SV2
failed (see item 6, Figure 6-18).
b. Boom enable valve SV1 faulty (stick-
ing open) (see item 1, Figure 6-18).
a. Replace faulty wiring or solenoid.
b. Repair or replace faulty valve.