T
roubleshooting
Maintenance Manual for Crawler Crane
No. Troubles Causes Solutions
10
The hydraulic system
makes noise.
1. The oil viscosity is too low. 1. Change hydraulic oil.
2. The oil temperature is too
2. Preheat the hydraulic
3. The back pressure of oil
3. Modify the hydraulic
11
The oil temperature is
too high.
1. The radiator or oil pipeline is
1. Clean the radiator or oil
2. The brand of hydraulic oil is
wrong.
2. Change the hydraulic oil.
3. The hydraulic oil
3. Change the hydraulic oil.
4. The oil in the hydraulic oil
tank is insufficient.
4. Add oil to specific value.
5. The solenoid valve of cooler
5. Change the solenoid valve.
12
The hydraulic pipeline
vibrates fiercely.
1. There is an amount of air in
1. Discharge the air.
2. The pipe clamp is loose. 2. Adjust the pipe clamp and fix
3. The overflow valve or safety
3. Clean the valve. ※
4. The pump, motor or valve
fail.
4. Check and repair the pump,
motor or valve, or change them
13
The pipe fitting leaks
oil.
1. The pipe fitting is not
1. Tighten the fitting.
2. The sealing element is
2. Change the sealing element.
14 The hose bursts.
1. The hose does not match
the applied pressure.
2. The hose is aging and
2. Change the hose.
3. The fitting of hose is
blocked.
3. Clean the hose and fitting.
15
The connectors of
hydraulic pump and
hydraulic motor leak
oil.
1. The reducer leaks gear oil.
1. Change the oil seal of
2. The hydraulic pump and
hydraulic motor leak oil.
2. Detect the pressure of oil
drain hole of pump and motor.
If it exceeds 3bar, modify the
oil drainage pipeline, and
change the oil seal of pump
※
If the component marked with ※ fails, never dismember or adjust it. You must contact
the crane manufacturer.
5-10
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