Jackco Model 842 - Manual (Page 5)

TROUBLESHOOTING
Problem Possible Cause Solution
Cylinder does not
advance, advances
slowly, or advances in
spurts.
1. Oil level in pump reservoir is
low.
2. Release valve open.
3. Loose hydraulic coupler.
4. Load is too heavy.
5. Air trapped in system.
6. Cylinder plunger binding.
1. Add old according the maintenance
instructions.
2. Close the release valve.
3. Check that all couplers are fully tightened.
4. Do not attempt to lift more than rated
tonnage.
5. Remove air according to the instructions.
6. Check for damage to cylinder. Have
cylinder serviced by a qualified hydraulic
technician.
Cylinder advance,
but does not hold
pressure.
1. Leaking connection.
2. Leaking seals.
3. Internal leakage in pump.
1. Check that all connections are tight and
leak free.
2. Locate leak(s) and have equipment
serviced by qualified hydraulic technician.
3. Have pump serviced by a qualified
hydraulic technician.
Cylinder does not
retract, retracts part
way, or retracts more
slowly than normal.
1. Pump reservoir is over-filled
2. Loose hydraulic coupler.
3. Air trapped in system.
4.Cylinder retraction spring
broken or other cylinder
damage.
1. Drain oil level to fill mark.
2. Check that all couplers are fully tightened.
3. Remove air according to the instructions.
4. Have cylinder serviced by a qualified
hydraulic technician.