24.3
Operations to be carried out only by an authorized
service center
FAULTS
CAUSE
REMEDIES
The crane does not lift
Non efficiency
Replace the pump
the loads indicated
of the pump
on the capacity plate
(main pressure or auxiliary)
Check the pressure,
valves not properly
adjust the valves
adjusted, or worn
or replace them!
Ram seals are
Replace the seals
not properly fitted
A boom of the crane
The safety check valve
Replace the valve
does not hold up the load
the ram is open
and visually lowers
Oil leaks inside the ram
Defective seals,
replace them!
The crane does not
Valves controlling the
Adjust the valves
rotate properly
rotation not adjusted
- WITH RACK:
Wear of rotation guide shoe
Replace the guide shoe
Wear of the seals
Replace the seals
of the rotation cylinder
- WITH SLEW RING:
Wear of the slew ring
Check the slew ring wear,
replace if necessary
Wear of the
Check the motore-
motoreducer group
ducer group wear,
replace if necessary
The extension booms
Wear of guide shoes
Check the
do not completely extend
guide shoes wear,
or work jerkily
replace if necessary
Vibrations in
Non efficient pump
Check the pump
crane operations
Noteable decrease in
Non efficient pump
Check the pump
movement speed
24.3
POSSIBLE FAULTS
GRU FASSI
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