Operation (Continued)
NOTE:
Never use foot pedal to raise
load.
This is a lifting
device only. The
load must be supported immediately by
other appropriate means.
LOWERING
Keep hands, feet,
and clutter clear of
ground area when lowering the load.
SLOWLY open the release valve by
turning the handle knob
counterclockwise.
Avoid shock loads
created by quickly
opening and closing the release valve
as the load is being lowered. Shock
loads can create dangerously high
operating pressures within the
hydraulic system, causing system
failure and resulting in personal injury
and/or property damage.
Maintenance
IMPORTANT:
When adding or
replacing oil, always use a good grade
hydraulic jack oil. Do not use hydraulic
brake fluid, alcohol, glycerine,
detergent motor oil or dirty oil.
Improper fluid can cause serious
internal damage to the jack rendering it
inoperative.
ADDING OIL
1. Position the jack on level ground and
fully lower the saddle. Remove oil
filler plug.
2. Fill oil to within 3/8” of filler hole.
DO NOT OVERFILL! If overfilled, the
jack will not lower to published
minimum height. If underfilled, the
jack will not reach published
maximum height. Adjust fluid level
as needed. Always reinstall oil filler
plug before use.
REPLACING OIL
1. Remove oil filler plug.
2. Turn jack over and drain old oil out
through oil filler plug hole.
3. Refill with new oil through the oil
filler plug hole.
IMPORTANT:
Do not allow dirt or other
foreign material to enter the hydraulic
system when filling.
4. After refilling, remove air from
system by opening release valve and
rapidly pumping handle several
times. Reinstall oil filler plug when
done.
LUBRICATION
1. For all models, add lubricating oil to
all moving parts as needed.
2. Models 3ZC66, 3W927, 3W928. Apply
grease to grease fittings periodically.
3. Models 5M455, 5M456, 5M457. Pour
air tool lubricant into the air supply
inlet at air control valve periodically.
PREVENTING RUST
1. Check ram and piston periodically for
signs of corrosion. Clean as needed
with an oily cloth.
2. When not in use, store jack with
saddle and piston fully retracted.
2
Westward Operating Instructions and Parts Manual
Westward Hydraulic Service Jacks
®
3ZC66, 3W927, 3W928 and 5M455 thru 5M457
Troubleshooting Chart
Jack will not lift load
1. Release valve not tightly closed
1. Ensure release valve tightly closed
2. Overload condition
2. Remedy overload condition
3. Pressure of air supply is too low
3. Change to a suitable air source
(for air models)
Jack bleeds off after lift
1. Same as above
1. Same as above
2. Hydraulic unit malfunctioning
2. Replace
Jack will not lower after unloading
1. Reservoir overfilled
1. Drain fluid to proper level
2. Linkages binding
2. Clean and lubricate moving parts
Poor lift performance
1. Fluid level low
1. Ensure proper fluid level
2. Air trapped in system
2. With ram fully retracted, remove oil
filler plug to let pressurized air
escape, reinstall oil filler plug
Will not lift to full height
Fluid level low
Ensure proper fluid level
Symptom
Possible Cause(s)
Corrective Action
