UT
Handbook for Use and Maitenance – 50000 WB-80-87-95
Edition
01/11
Revisione
00
47
50000WB_e111_E.doc
c) The general pressure valve is durty
To clean and to reset the correct
calibration
4.3 - THE CRANE MOVES BY
JERKS AND VIBRATES
a) Oil temperature too low
Operate the crane without load for
a few minutes
b) No oil
Top up to level.
c) Suction pipe crushed or tap partially
closed
Reset the correct conditions
d) Pump broken
Replace the pump and filter
4.4 - THE MOVEMENTS ARE
SPONGY
a) There is air in the oil
Remove the air suction points and
bleed
by
repeatedly
operating
movements fully to end of stroke.
4.5 - THE EXTENSION
CYLINDERS VIBRATE WHEN
MOVING OUTWARDS OR
INWARDS AND ARE OUT OF
SEQUENCE
a) Were pads not lubricated
Lubricate sufficiently
b) Oil shortage in the tank
Top up
4.6 - THE EXTENSION
CYLINDERS EXTEND
UNCONTROLLEDLY
a) The control valve is broken
Replace it.
b) The seals are broken
Replace them.
THE OPERATIONS DESCRIBED UNDER POINTS 4.1.a-d-e-f; 4.2.a-b-c: 4.3.d; 4.6.a-b,
MUST BE PERFORMED IN REPAIR SHOPS AUTHORIZED BY CORMACH.
IF LEAD SEALS ARE REMOVED BY UNAUTHORISED PERSONS, THIS MAKES
THE GUARANTEE VOID AND NULL AND RELIEVES CORMACH OF ANY
LIABILITY WHATSOEVER.
CONTACT CORMARCH AUTHORIZED REPAIR SHOPS FOR ANY PROBLEMS THAT
CANNOT BE SOLVED PROMPTLY OR THAT ARE RECURRENT.