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. Im-
proper fluid can cause failure of the jack and
the potential for sudden and immediate loss
of load. We recommend Mobil DTE13M or
equivalent.
Adding oil
1. With saddle fully lowered set jack in its
upright, level position. Locate and remove
oil filler plug.
2. Fill with oil until ~3/16” above the inner
cylinder as seen from the oil filler plug
hole. Reinstall the oil filler plug.
Changing oil
For best performance and longest life,
replace the complete fluid supply at least
once per year.
1. With saddle fully lowered, remove the oil
filler plug.
4
5
MAINTENANCE (continued)
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 plug
hole. Reinstall the oil filler plug.
Lubrication
A periodic coating of light lubricating oil to
pivot points, axles and hinges will help to
prevent rust and assure that wheels, cast-
ers 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.
REPLACEMENT PARTS
Not all components of the jack are replacement items, but are illustrated as a convenient
reference of location and position in the assembly sequence. When ordering parts, give
model number, serial number and description below. Call or write for current pricing:
phone (816) 891-6390, fax (816) 891-6599 or contact Pro-Lift Customer Support.
10939 N. Pomona Ave., Kansas City, MO 64153.
Model F-798, F-788 and F-2533
Part No.
Description
Quantity
1
power unit
1
2
front wheel assembly
2
3
rear caster assembly
2
4
saddle
1
5
oil filler plug
1
6
return spring
1
7
handle
1
8
spring clips
1
--
labels
2
--
owner’s manual
1
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 Pro-Lift Customer Support
• Ensure proper fluid level
• Ensure proper fluid level
• With lift arm fully lowered,
remove oil filler plug to let
pressurized air escape, then
reinstall oil filler plug
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
1
2
3
4
5
6
7
8
