OPERATING MANUAL & PARTS LIST FOR 791-6570/791-6600
6570/6600
7
06/01/01
S
YMPTOM
P
OSSIBLE
C
AUSES
C
ORRECTIVE
A
CTION
will not lift at all
1. Release valve not properly closed
1. Tighten securely
2. No oil in system
2. Fill to prescribe level
3. Valve may not be properly seated
3. Clean to remove dirt or foreign
matter and replace oil
4. Packing worn out or defective
4. Replace packing
will lift only part way
5. Oil level low or too high
5. Fill or take excess oil out
will lift load, but will not hold
6. One of the following valves is
6. inspect valves–clean and adjust
not functioning:
seat surface
a. suction valve
b. delivery valve
c. release valve
d. by-pass valve
7. Packing worn our or defective
7. Replace packing
will not lower
8. Release valve not opening
8. Clean and adjust release valve
poor lifting
9. Pump packing defective or
9. Replace packing and/or clean
valves malfunctioning
valves
10. Dirty oil 10. Replace oil.
11. Air in system 11. Remove air from system
will not lower completely 12. Piston rod bent or marred 12. Replace piston rod
13. Jack spring damaged 13. Replace spring
14. Link section warped or deformed 14. Replace the parts
due to possible over-loading