6
Maintenance
•
Keep oil reservoir filled.
•
Clean the jack after use.
•
Check sliding and rotating parts. Oil as
needed.
•
When storing the jack, keep the handle
upright and the ram in the lowest position.
•
Periodically check the pump piston and ram
for signs of rust or corrosion. Clean as
needed and wipe with an oily cloth.
For best performance and long life, replace the
complete fluid supply at least once per year.
Changing the Oil:
1. Lower the ram to the lowest position.
2. Remove filler plug (96).
3. Tilt jack on its side and drain the fluid into a
suitable container. Dispose of oil according
to local regulations.
4. Fill reservoir with clean hydraulic jack oil
until level is to the bottom of the fill hole.
Only use good quality hydraulic jack oil
such as Mobil DTE 13. Never use brake
fluid, transmission fluid, motor oil or turbine
oil.
5. Re-install filler plug (96).
Troubleshooting
Trouble Probable
Cause
Remedy
Release valve not tightly closed.
Tighten release valve knob.
Overload condition.
Remedy overload condition.
Jack will not lift load.
Pressure of air supply is too low.
Change to a suitable pressured air
source.
Release valve not tightly closed.
Tighten release valve knob.
Overload condition.
Remedy overload condition.
Jack bleeds off after
lift.
Hydraulic unit malfunction.
Contact WMH Technical Service.
Reservoir is overfilled.
Drain oil to proper level.
Jack will not lower
after unloading.
Linkages binding.
Clean and lubricate moving parts.
Oil level low.
Fill oil to proper level.
Poor lift performance.
Air is trapped in system.
With ram fully lowered, remove oil
filler plug to let air escape; reinstall oil
filler plug.
Jack will not lift to full
extension.
Oil level low.
Fill oil to proper level.
Replacement Parts
Replacement parts are listed on the following pages. To order parts or reach our service department, call
1-800-274-6848 between 7:30 a.m. and 6:00 p.m. (CST), Monday through Friday. Having the Model
Number and Serial Number of your machine available when you call will allow us to serve you quickly and
accurately.
