Harbor Freight Tools Central Hydraulics 95553 - Manual (Page 13)

Page 13 For technical questions, please call 1-800-444-3353. Item 69593/69642/95553
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Troubleshooting
1. If the Jack fails to lift, or fades under load, first check that the Release Valve is closed. Engage the notches at the
end of the Jack Handle onto the Release Valve and turn clockwise. Check to see if this has solved the problem.
2. Next check to see if there are any leaks in the air system. Examine all connections and valves to see if
there is a leak. If so, have a qualified service technician repair the connection or replace the faulty part.
3. Check to see if there are any leaks in the hydraulic system. Leaks will produce visible hydraulic fluid at
the separation. If there are any leaks, have a qualified repair technician tighten, repair or replace any
leaking components.
4. Air in the hydraulic system will cause the jack to fade. If no leaks are detected, purge the hydraulic system to
remove any trapped air. SeePurging Air From Hydraulic System on page 7.
5. The Air pump mechanism may be stuck. To remedy this, open the release valve, and operate the air lever fully.
6. If none of these troubleshooting options solves the problem, it is possible that the seals of the jack have been
damaged by overloading, dirt on the ram or other environmental factors. Have a qualified service technician
inspect the Jack for faults and possible repair. See below for more troubleshooting tips and information.
To prevent Serious Injury:
Use caution when troubleshooting a malfunctioning jack. Stay well clear of the supported load.
Completely resolve all problems before use. If the solutions presented in the Troubleshooting guide
do not solve the problem, have a qualified technician inspect and repair the jack before use.
After the jack is repaired: Test it carefully without a load by raising and lowering it fully,
checking for proper operation, BEFORE RETURNING THE JACK TO OPERATION.
DO NOT USE A DAMAGED OR MALFUNcTIONING JAcK!
pOSSIBLE SyMpTOMS
pROBABLE SOLUTION
(Make certain that the jack is not supporting
a load while attempting a solution.)
Jack will
not lift at
its weight
capacity
Saddle
lowers
under
load
Pump
stroke
feels
spongy
Saddle
will not
lift all the
way
Handle
moves up
when jack
is under
load
Oil leaking
from filler
plug
X X Check that Release Valve is fully closed.
Bleed air from the system.
X X X
Valves may be blocked and may not
close fully. To flush the valves:
1. Lower the Saddle and securely
close the Release Valve.
2. Manually lift the saddle several inches.
3. Open the release valve and force the
saddle down as quickly as possible.
X
X X
Jack may be low on oil.
Check the oil level and refill if needed.
Jack may require bleeding
- see Purging Air From
Hydraulic System on page 7.
X
Unit may have too much
hydraulic oil inside, check fluid
level and adjust if needed.