Palms 840 - 9.4 Lubrication; 10. Troubleshooting Common Issues

FOREST CRANE PALMS 840
V 1.03 EN  2012 Palmse Mehaanikakoda LLC 29
10. TROUBLESHOOTING
TROUBLE
POSSIBLE CAUSE
REMEDY
CRANE’S WORKING
MOVEMENTS ARE SLOW
PUMP RUNNING TOO SLOWLY
CHECK PUMP ROTATING SPEED
NOT ENOUGH OIL
ADD OIL (AIR-BLEEDING)
FAULTY PUMP
CHANGE OR GET THE PUMP FIXED
LEAKS OR OBSTRUCTIONS IN OIL LINES
INSPECT AND CLEAN OIL LINES
OIL IS TOO THICK
CHANGE TO A THINNER (PROPER)
OIL GRADE
CRANE’S DESCENDING
MOVEMENTS ARE 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 (PROPER) OIL
GRADE
CRANE’S MOVEMENTS ARE
TOO FAST
ROTATION SPEED TOO HIGH OR PUMP IS
TOO POWERFUL
CHOOSE A CORRECT PUMP/ SPEED OF
ROTATION
INCORRECT OPERATION
LEARN TO OPEN THE CONTROL VALVE TO A
SUITABLE DEGREE
CRANE’S WORKING
MOVEMENTS ARE
POWERLESS
NOT ENOUGH OIL
ADD OIL (ALSO AIR BLEEDING)
FAULTY PUMP
CHANGE OR GET THE PUMP FIXED
FAULTY OF RELIEF OR SHOCK VALVES OR
WRONG ADJUSTMENT
CHANGE THE RELIEF OR SHOCK VALVES
OR ADJUST IN RIGHT WAY
FAULTY CONTROL VALVE
CHANGE OR GET THE VALVE FIXED
FAULTY CYLINDERS OR SEALS
CHECK THE CYLINDERS AND CHANGE THE
SEALS
CRANE’S MOVEMENTS ARE
JERKY
AIR IN HYDRAULIC SYSTEM
CHECK OIL LEVEL, BLEED AIR FROM
SYSTEM
CHECK FOR OBSTRUCTIONS
OR LEAKS ON THE INLET SIDE
FAULTY PUMP
INSPECT THE PUMP AND GET IT FIXED
BOOMS DESCEND BY
THEMSELVES
FAULTY CONTROL VALVE
REPLACE/FIX THE VALVE
FAULTY CYLINDERS OR HOSES
FIX THE LEAKAGE POINT, CHECK CYLINDER
SEALS
CONTROL VALVE STEMS
ARE STICKING
VALVE’S FIXING SCREWS TOO TIGHT
CHECK SCREWS TIGHTENING TORQUE (50
Nm (5 kPm, 37 ftXlb)
VALVE NOT ON LEVEL MOUNTING BASE
MOUNT THE VALVE ON A LEVEL BASE
VALVES’ TIE BOLTS TOO TIGHT
CHECK SCREWS TIGHTENING TORQUE 27,5
Nm (2,75 kPm, 20 ftXlb)
GRAPPLE’S OPENS BY
ITSELF
FAULTY VALVE
FIX THE VALVE
FAULTY CILINDER OF THE GRAPPLE
FIX OR CHANGE THE CILINDER
FAULTY ROTATOR
FIX OR CHANGE THE ROTATOR
Table 6. Troubleshooting table