Farmi Forest CR67, Operation, Maintenance And Spare Parts Manual

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31 CR67
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 the valve
Faulty cylinder of the grapple Repair or change the cylinder
Faulty rotator Repair or change the rotator
TROUBLESHOOTING