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TROUBLESHOOTING
7 TROUBLESHOOTING
The operational failure table below shows the possible most common faults, their causes, and the
measures that can be taken so the interference can be eliminated.
7.1.1 Safety instructions
* When carrying out repairs and measures to remove the cause of the failure, all the instructions
issued on the crane operation and safety should be strictly adhered to.
FAILURE
POSSIBLE CAUSE OF THE
FAILURE
The crane does
- There is no oil in the tank
not move
- Pressure connection is not con-
nected or is faulty
- The pump does not build up
pressure
The crane moves
- Return connector is not connect-
a little bit, or is
ed or is faulty
powerless
- The main release of the crane or
pump pressure relief valve is faulty
or dirty
One option is
- The spool specific pressure re-
powerless
lease valve is faulty or dirty
The boom is low-
- the pressure relief valve of the
ered at normal
relevant operation is leaking
load
- Cylinder seal is leaking
- The valve spool is leaking
The hydraulic
- The pump is worn loose
system is heating
- Pump capacity too large for the
up
valves in question
- Too little oil in the hydraulic sys-
tem
- The valve
- Overheated hydraulic oil
spools are sticky
- Impurities in the valve
- The studs connecting the valve
blocks are too tight or too loose
The turning de-
- Cylinder seal of the turning de-
vice body drains
vice is leaking
the oil
- Too much grease in the turning
device
- The shaft seal is leaking
MEASURE
- Add oil
- Check the connection and replace a new
quick coupler if necessary
- Measure the pressure from the pressure
end of the control valve , check the pump
pressure relief valve
- Check the connection, measure the re-
turn pressure
- Measure the pressure from the pressure
end of the control valve , if necessary
replace the pressure relief valve
- Measure the pressure of the relevant
operation and replace with a new pres-
sure relief valve if necessary
- Replace the pressure relief valve
- The functionality falls under the load and
the cylinder heats up when putting a load
on it.
- Replace the seals
- Measure the pressure when the oil is
hot. If necessary, replace the pump
- Measure the return pressure, adjust the
flow rate to less
- Add oil
- See the previous item
- Check whether the oil and filters are
changed according to the recommenda-
tions
- Check the tightening torques
- If necessary, replace the seals (seals
may leak a little oil go a little past, when
the oils are very cold)
- Tighten by turning the spring of the shaft
seal, replace the shaft seal if necessary
46
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