31
CR69
TROUBLE
POSSIBLE CAUSE
REMEDY
CRANES WORKING
MOVEMENTS SLOW
Pump is too slow
Check pumps rotating speed
Faulty pump
Change or repair the pump
Not enough oil
Add oil (air-bleeding)
Leaks or obstructions in hoses
Inspect hoses
Oil too thick
Change to a thinner (correct) oil grade
CRANES DESCENDING
MOVEMENTS SLOW
Obstructions in the hoses
Check the hoses and the chokes
Clogged-up (return) filter
Clean or renew filter
Oil too thick
Change to a thinner (correct) oil grade
CRANES MOVEMENTS
TOO FAST
Rotation speed too high or pump too
big
Choose a correct speed of rotation and
correct pump size
Incorrect operation
Learn to open the control valve to a suitable
degree
CRANES WORKING
MOVEMENTS
POWERLESS
Not enough oil
Add oil (air bleeding)
Faulty pump
Change or repair the pump
Faulty relief valve or shock valves
Change the relief valve or shock valves
Faulty control valve
Change or repair the valve
Faulty cylinders or seals
Check the cylinders and change the seals
CRANE MOVEMENTS
ARE JERKY
Air in hydraulic system
Check oil level, bleed air from system
Not enough oil
Check there are no obstructions or leaks on
the inlet side,
Add oil
Faulty pump
Check the pump and repair it
CONTROL VALVE’S
SPOOLS STICKING
Valve’s fixing screws too tight
Check screws tightening torque
50 Nm (5 kPm37 ftXlb)
Valve not on level mounting base
Mount the valve on a level base
Valve’s tie bolts too tight,
Faulty spool
Check screws tightening torque
27,5 Nm (20 ftXlb).
Change a new block with spools.
GRAPPLE OPENS BY
ITSELF
Faulty valve
Repair or change the valve
Faulty cylinder of the grapple
Change the cylinder
Faulty rotator
Repair or change the rotator
TROUBLESHOOTING
Summary of Contents for CR69
Page 2: ...2 CR69 ...
Page 29: ...29 CR69 A H F E D G H C I C B B C B B 6 LUBRICATION POINTS ...
Page 36: ...36 CR69 17 8 10 16 18 20 22 21 3 6 7 12 5 13 23 9 15 11 1 19 2 4 14 CR69 SLEWING AND COLUMN ...
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