Jackco 65300, User Manual, Page: 5 / 8

Caution: To prevent personal injury, all inspection, maintenance, and repair
procedures must be performed when the jack is free of load.
TROUBLESHOOTING
Trouble Cause Solution
Jack does not lift
1.Release valve is open 1. Verify the release valve is
closed. Release valve may
need cleaning.
2.Low/no hydraulic fluid in
reservoir
2. Fill with approved hydraulic
fluid and bleed system
3. Air trapped in hydraulic system 3. Follow the purge air
procedure
4.Load is above capacity of jack 4. Use correct equipment
5.Delivery valve and/or bypass
valve not working correctly
5. Clean to remove dirt or
foreign objects from the
system. Replace hydraulic
fluid
6.Seals worn or defective 6.Replace seals
Jack lifts only partially
1.Too much or not enough
hydraulic fluid
1. Check hydraulic fluid level
Jack advance slowly
1.Pump not working correctly 1.Rework pump
2.Seals leaking 2.Replace seals/O-rings
Jack lifts load,
but doesn’t hold
1.Cylinder packing is leaking 1.Replace packing
2.Valve not working
correctly(suction, delivery,
release, or bypass)
2.Inspect valves. Replace if
necessary
3. Air trapped in hydraulic system 3. follow the purge air
procedure
Jack leaks hydraulic
fluid
1.Worn or damaged seals 1.Replace seals
Jack will not retract
1. Release valve is closed 1.Open the release valve by
turning the handle counter-
clockwise (CCW). Maybe
necessary to clean release
valve.
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