MAINTENANCE
Important: Use only a good grade hydraulic jack oil. Avoid mixing different types of fluid and
NEVER
use brake fluid,
turbine oil, transmission fluid, motor oil or glycerin. Improper fluid can cause failure of the jack and the potential for sudden
and immediate loss of load. We recommend Hein-Werner hydraulic jack oil HW93291 or equivalent.
ADDING OIL TO HYDRAULIC UNIT
1. With saddle fully lowered set jack in its upright, level position. Locate and remove oil filler plug.
2. Fill with oil even with the bottom of oil filler plug hole. Reinstall the oil filler plug.
CHANGING OIL IN HYDRAULIC UNIT
For best performance and longest life, replace the complete fluid supply at least once per year.
1. Remove hydraulic unit from wheel dolly. Set hydraulic unit upright on a hard, level surface.
2. With saddle fully lowered, remove the oil filler plug.
3. Lay the jack on its side and drain the fluid into a suitable container.
Note:
Dispose of hydraulic fluid in accordance with local regulations.
4. Fill with oil even with the bottom of oil filler plug hole. Reinstall the oil filler plug.
LUBRICATION
A periodic coating of light lubricating oil to wheel dolly and hydraulic unit pivot points will help to ensure that all moving
parts function smoothly.
CLEANING
Periodically check the pump piston and ram for signs of rust or corrosion. Clean as needed and wipe with an oily
cloth.
Note:
Never use sandpaper or abrasive material on these surfaces.
STORAGE
Store the jack with the pump piston, ram plunger, and saddle fully lowered and the release valve open, but never more
than 1 turn. This will help prevent rust and corrosion to those critical surfaces.
5
TROUBLESHOOTING
(*) "bleeds off" refers to an unexpected loss of load height due to a loss of hydraulic pressure
Symptom
Possible Causes
Corrective Action
Hydraulic unit will not lift load
• Release valve not tightly closed
• Ensure release valve tightly closed
Hydraulic unit *bleeds off after
lifting
• Release valve not tightly closed
• Hydraulic unit malfunction
• Ensure release valve tightly closed
• Contact Hein-Werner Tech. Service
Hydraulic unit will not lower after
unloading
• Reservoir overfilled
• Linkages binding
• Drain fluid to proper level
• Clean and lubricate moving parts
Poor performance
• Fluid level low
• Air trapped in system
• Ensure proper fluid level
• With ram fully retracted, remove oil
filler plug to let pressurized air escape,
then reinstall oil filler plug
Will not lift to full extension
• Fluid level low
• Ensure proper fluid level
