Pub. No. 1218 - February 2008
17
RITE-HITE
®
RHV Dock Leveler Owner’s Manual
TROUBLESHOOTING CHART
Problem
Cause Solution
1. Unit will not operate.
a. No power.
a. Check the main power supply. Check fuses in the
control box and disconnect.
b. Overload relay tripped.
b. Single phase unit should reset automatically. Three
phase unit should be reset manually in the control
box.
c. Loose connection.
c. Verify that all connections are tight and no wires
are broken. Verify that pushbutton contacts are
functional.
d. Is the voltage/motor phase
d. Check power requirements. correct?
e. Is motor wired correctly?
e. Check wiring.
2. Unit functions slowly.
a. Low oil.
a. Check oil level and refill if necessary.
b. Improper voltage.
b. Verify that the power unit is proper for the
incoming voltage.
c. Improper maintenance.
c. Perform all required maintenance, see
“Maintenance Procedures”.
d. Hose leak.
d. Check hoses, valves and fittings for leaks, and
replace if necessary.
e. Debris in hydraulic system.
e. Verify that there is not debris stuck in the system.
f. Spool valves are not
f. Verify that the spools are magnetized. If not, verify
opening fully.
wiring and/or replace solenoid coil. Check power
requirements for motor.
g. Faulty pump or motor.
g. Replace power unit assembly.
3. Functions stop during
a. No power.
a. Check main power supply. Check fuses in the
control box cycle.
and disconnect.
b. Overload relay tripped.
b. Single phase unit should reset automatically. Three
phase unit should be reset manually in the control
box.
c. Loose connection.
c. Verify that all connections are tight and no wires
are broken. Verify that pushbutton contacts are
functional.
d. Improper maintenance.
d. Perform all required maintenance, see
“Maintenance Procedures”.
e. “CB” valve is not adjusted
e. Verify “CB” valve setting. See page 15.
properly (velocity fuse lockup).
f. Hydraulic system.
f. Check to make sure that the hydraulic pump has
power. Check hoses, valves, and fittings for leaks.
Replace power unit assembly.
4. Lip falls too slowly or
a. Improper maintenance.
a. Check for debris, lubricate lip spools. not at all.
b. Lip cylinder binding.
b. Check for debris, replace lip cylinder.
c. Faulty or incorrect P.O.
c. Check for debris in system, replace flow control.
flow control.
d. Faulty or incorrect check
d. Make sure check valve is correct for lip size,
valve.
check for debris, replace.
f. Lip bent.
f. Call your authorized RITE-HITE
®
Service
Representative or RITE-HITE
®
at 1-800-456-0600.
5. Lip falls too fast.
a. Faulty or incorrect P.O.
a. Check for debris in system, replace flow control.
flow control.
b. Three-way valve is not
b. Check solenoid coil for magnetism/operation.
Check valve for debris by removing from valve
block and plunging valve. Replace valve assembly.
