18
Pub. No. 1210 - April 2016
RITE-HITE
®
RHH-4000 Dock Leveler Owner’s Manual
HYDRAULIC POWERED LEVELER TROUBLESHOOTING
Problem
Probable Cause Solution
1. Platform does not raise
a. Power has been disconnected.
a. Verify that power has not been
disconnected.
Verify that disconnect circuit breaker or fuses
are not tripped.
b. The motor has been miswired.
b. Verify that the motor has been wired
according to the motor wiring diagram.
c. Overload tripped.
c. Push RESET on overload relay.
d. Debris is lodged on or around
d. Check for and remove any lodged
the leveler.
materials on or around the leveler.
e. Hydraulic fluid level is low.
e. Check oil level when the unit is held
open with the maint. support.
Refill if necessary.
2. Leveler runs continuously.
a. The pushbutton, contact block
a. Repair or replace components.
or motor contactor damaged.
3. Lip extends slowly and/or does not
a. Debris on lip hinge.
a. Remove debris from the lip hinge.
extend.
b. Lip impacted or bent.
b. Lubricate per maintenance
procedures or replace lip.
c. Hydraulic fluid level low.
c. Check oil level when unit is held
open with the maint. support.
Refill if necessary.
4. Platform does not lower.
a. Velocity fuse has locked up.
a. Attempt to raise the unit to unlock the
velocity fuse.
b. Debris is lodged on or around
b. Check and remove any lodged
the leveler.
debris on or around leveler.
5. Platform raises very slowly.
a. Weight on top of platform.
a. Remove weight from platform.
b. Hydraulic fluid level is low.
b. Check oil level when the unit is held
open with the maint. support.
Refill if necessary.
c. Low voltage
c. Verify ± 10% nominal voltage while
unit is running.
d. Power unit/pump/motor failure.
d. Replace power unit assembly.
6. Lip does not store properly.
a. The lip stop bolt is not adjusted
a. Verify that the lip stop bolt is properly
properly.
adjusted.
b. Debris.
b. Remove debris.
c. Lip supports.
c. Repair or replace the lip supports.
7. Fuse or circuit breaker trips.
a. Undersized fuse or circuit
a. Verify 20 amp for 120VAC and 15
breaker.
amp for 240VAC.
b. Low voltage.
b. Verify ± 10% nominal voltage while
unit is running.
c. Short circuit in wiring.
c. Check wiring connections and verify.
d. Wire gage is too small. Distance
d. Verify minimum wire gage per
is too long.
distance is correct. See chart on
page 22.
