Harbor Freight Tools 94487 - Manual (Page 9)

Page 9 For technical questions, please call 1-800-444-3353. SKU 94487 95553
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 5.
X
Unit may have too much
hydraulic oil inside, check fluid
level and adjust if needed.
Troubleshooting
1. If the Jack fails to lift, or fades under load, first
check that the Release Valve (4) is closed. Engage
the notches at the end of the Jack Handle (45)
onto the Release Valve (4) 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. See page 4.
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.