EP Equipment CPD30L1-B, Service Manual

Page: 191 / 235

REV. 05/2020
TROUBLESHOOTING
10
179
Table 9.1 Troubleshooting of Common Faults (continued)
Fault Fault Symptom Troubleshooting Order * Troubleshooting Measures
Hydraulic
Failure
1. The vehicle cannot
lift
1. Pump motor does not work:
a. Parking brake switch and seat
switch or its circuit connection
failure
b. Pump motor or its circuit
connection failure
c. Control switch or its circuit
connection failure
d. Controller failure
2. Pump motor works:
a. Overload
b. Insufficient hydraulic oil
c. Hydraulic pipeline leakage
d. Pump motor reverse rotation
e. Cylinder failure (blocked)
f. Solenoid valve blocked and
cannot reset
g. Valve body failure:
excessive wear of gear pump,
serious internal leaks, insufficient
pressure of relief valve or
blocked, check valve blocked
1. Pump motor does not work:
1) Check if parking brake switch
and seat switch or the connec-
tion of its circuit is normal;
2) Check the pump motor and its
connection circuit;
3) Check the control button and its
connection circuit;
4) Replace the controller.
2. Pump motor works:
1) Refer to the rated capacity
marked on the nameplate;
2) Lower the mast to the bottom,
check if the amount of oil in the
oil tank can meet the requireme-
nts;
3) Check the pipe and hydraulic
components for oil leaks;
4) Check the pump motor wiring;
5) Check the cylinder for damage
or deformation, remove the
cylinder to check for wear or
aged seals inside;
6) Wash or replace the solenoid
spool
7) Wash or replace the valve body
2. The vehicle cannot
be lowered a. Solenoid valve (or manual
valve) or its circuit connection
failure
b. Lowering switch or its circuit
connection failure
c. Valve failure;
d. Cylinder deformation or blocked
e. Explosion-proof valve blocked
1) Check the lowering button and
its connection circuit;
2) Check the solenoid valve and
its connection circuit;
3) Check the cylinder for
deformation, remove the
cylinder to check if the internal
assembly is normal
4) Clean or replace the valve;
5) Replace the explosion-proof
valve.
* Carry out trouble shooting in accordance with the order listed
in the table, it can help you quickly identify problems and
resolve accordingly.