4
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 Mobil DTE 13M or equivalent.
Adding oil
1. With saddle fully lowered set jack in its upright, level
position. Locate and remove oil filler screw.
2. Fill with oil until ~3/16" above the inner cylinder as
seen from the oil filler screw hole. Reinstall the oil
filler screw.
Changing oil
For best performance and longest life, replace the com-
plete fluid supply at least once per year.
1. With saddle fully lowered, remove the oil filler screw.
2. Lay the jack on its side and drain the fluid into a
suitable container.
Note:
Dispose of hydraulic fluid in accordance with local
regulations.
3. Fill with oil until ~3/16" above the inner cylinder as
seen from the oil filler screw hole. Reinstall the oil
filler screw.
Lubrication
A periodic coating of light lubricating oil to pivot points,
axles and hinges will help to prevent rust and assure
that wheels, castors and pump assemblies move freely.
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
When not in use, store the jack with saddle fully lowered.
Possible Causes
Corrective Action
Jack will not lift load
Jack bleeds off after lift
Will not lift to full extension
• Release valve not tightly closed
• Overload condition
• Fluid level low
• Fluid level low
• Air trapped in system
• Release valve not tightly closed
• Overload condition
• Hydraulic unit malfunction
• Ensure release valve tightly closed
• Remedy overload condition
• Ensure release valve tightly closed
• Remedy overload condition
• Contact Mac Tools Tech. Service
• Ensure proper fluid level
• Ensure proper fluid level
• With ram fully retracted, remove oil
filler screw to let pressurized air
escape, then reinstall oil filler screw
Poor lift performance
Jack will not lower after unloading
• Reservoir overfilled
• Linkages binding
• Drain fluid to proper level
• Clean and lubricate moving parts
TROUBLESHOOTING
Symptom
