Jackco Models 66300B - Manual (Page 5)

Caution: To prevent personal injury, all inspection, maintenance, and repair
procedures must be performed when the jack is free of load.
TROUBLESHOOTING
Trouble Solution
Jack will not lift load or leaks down
excessively
1. The release valve is not closed. Turn the
valve clockwise tightly. If this does not
work, remove handle, lubricate handle
receptacle and handle end, then retry.
2.Low on hydraulic fluid. Follow Step 5 of
the "ASSEMBLY" procedure on page 3.
3.Pump seals or back-up ring may be
defective. Clean hydraulic fluid passages,
replace seals and refill hydraulic fluid.
(Must be serviced by qualified service
center
Jack will not lift to its full height
1.Low on hydraulic fluid. Follow Step 5 of
the "ASSEMBLY" procedure on page 3.
2.The hydraulic system has trapped air.
Follow Step 5 of the "ASSEMBLY"
procedure on page 3.
Jack will not lower completely
Return spring is broken or linkages are
binding. Replace spring if broken. Grease
pivot shaft and all lift arm linkages.
Jack will not lift smoothly or jack
feels spongy
The hydraulic system has trapped air.
Follow Step 5 of the "ASSEMBLY"
procedure on page 3.
Jack will not hold load or handle
rises
Discharge ball is not sealing hydraulic
system and oil may be dirty. Manually flush
hydraulic system. Open the release valve,
as required, to raise and lower the lift arm.
Manually raise and lower lift arm.
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