Operation (cont.)
LOWERING
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/
vent 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/vent plug before
use.
REPLACING OIL
1. Remove oil filler/vent plug.
2. Turn jack over and drain old oil out
through oil filler plug hole.
3. Refill with new oil through the oil filler
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/vent plug when done.
LUBRICATION
1. Add lubricating oil to all moving parts as
needed.
2. Apply grease to grease fittings
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 Quick Lifting
Jacks
®
5ML68A, 5ML69A and 5ML70A
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
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
To Next Page
Loading...
