FARMI 4670
21
TROUBLE
POSSIBLE CAUSE
REMEDY
CRANES WORKING
MOVEMENTS SLOW
PUMP IS TOO SLOW
CHECK PUMPS ROTATING SPEED
FAULTY PUMP
CHANGE OR GET THE PUMP FIXED
LEAKS OR OBSTRUCTIONS IN OIL
LINES
INSPECT OIL LINES
OIL TOO THICK
CHANGE TO A THINNER (CORRECT) OIL
GRADE
CRANES DESCENDING
MOVEMENTS SLOW
OBSTRUCTIONS IN THE OIL LINES
CHECK THE LINES 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 GET THE PUMP FIXED
FAULTY RELIEF VALVE OR SHOCK
VALVES
CHANGE THE RELIEF VALVE OR SHOCK
VALVES
FAULTY CONTROL VALVE
CHANGE OR GET THE VALVE FIXED
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 GET IT FIXED
BOOMS DESCEND BY
THEMSELVES
FAULTY CONTROL VALVE
INSPECT THE CONTROL VALVE AND GET IT
FIXED
FAULTY CYLINDERS OR HOSES
FAULTY SHOCK VALVE
FIX THE LEAKAGE POINT. CHECK CYLINDERS
AND SEALS,
CHECK, CLEAN, ADJUST
CONTROL VALVE’S
SPINDLES STICKING
VALVE’S FIXING SCREWS TOO TIGHT
CHECK SCREWS TIGHTENING TORQUE 50
Nm (5 kPm)
VALVE NOT ON LEVEL MOUNTING
BASE
MOUNT THE VALVE ON A LEVEL BASE
VALVE’S TIE BOLTS TOO TIGHT,
FAULTY SPINDLE
CHECK SCREWS TIGHTENING TORQUE (CON-
TACT THE MANUFACTURER),
CHANGE A NEW BLOCK WITH SPINDLES
TROUBLE SHOOTING
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