Westward Hydraulic
Service Jacks
Operating Instructions & Parts Manual
3ZC66, 3W927, 3W928 and 5M455 thru 5M457
Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the product described.
Protect yourself and others by observing all safety information. Failure to comply with instructions could result in personal injury and/or
property damage! Retain instructions for future reference.
®
Description
Westward hydraulic service jacks are used for lifting part of a total vehicle (i.e., one
wheel). Jacks are equipped with a built-in by-pass device to prevent damage to
jack from overpumping. An internal safety valve prevents damage to jack from
overloading. Applications include automotive, truck, farm, industrial and
construction. Air models feature a powerful air motor, for effortless lifts of rated
loads, conventional foot pumping and handle pumping. These jacks are designed
to meet applicable ASME/ANSI Standards.
Specifications
Min.
Max.
Model
Capacity
Length
Height
Height
3W927
4 Ton
50
5
/
8
"
5"
24"
3ZC66
5
55
3
/
4
7
27
3W928
10
54
3
/
4
7
27
5M455 (air model) 4
50
5
/
8
5
24
5M456 (air model) 5
57
3
/
4
7
27
5M457 (air model) 10
54
3
/
4
7
27
General Safety Information
Study, understand,
and follow all
instructions before operating this
device. Lifting device only. Intended
use is for lifting part of a total vehicle,
only one wheel or axle at a time.
Immediately after lifting, support
vehicle with appropriate means. Do
not exceed rated capacity. Use only on
hard, level surfaces capable of
sustaining rated capacity loads. Lift
only on those areas of the vehicle as
specified by the vehicle manufacturer.
Ensure that the lift point is properly
centered on the jack saddle. Always
wear safety glasses when using this
equipment. Inspect jack before each
use. Do not use if bent, broken,
leaking, or damaged components are
noted. No alteration of this product is
allowed. Do not use this device for
any purpose other than that for which
it was intended. Failure to heed any
one or combination of these warnings
may result in severe personal injury
and/or property damage.
Assembly
Use figure 1 as reference.
1. Assemble the handle to handle
socket by inserting the handle piece
into the socket; align the handle
with jack chassis, then tighten the
hexagon nut securely.
2. Try to operate the release
mechanism by turning the release
knob located on top of the handle
clockwise and counterclockwise to
see if release shaft fits together well.
3. Occasionally, hydraulic jacks become
air bound and will not function
properly. To correct this condition,
remove oil filler plug. This will allow
any pressurized air to escape. Check
for proper oil level (see Adding Oil,
page 2), adjust as needed. DO NOT
OVERFILL! Reinstall oil filler plug.
4. Pour a teaspoon of air tool lubricant
into air supply inlet of air control
valve. Connect to air supply and
operate for 3 seconds to evenly
distribute lubricant.
5. Squirt a small amount of hydraulic
jack oil on pistons and thoroughly
lubricate all moving parts of jack.
Operation
Off-centered loads
and loads lifted
while jack is not level may damage the
jack or cause personal injury.
LIFTING
1. Prevent inadvertent vehicle
movement by fully engaging
emergency brake, putting
transmission in park. Use wheel
chocks in pairs on the wheel
diagonally opposed to the wheel or
axle lifted.
2. Close release valve by turning the
release knob on top of handle
clockwise until it is firmly closed.
3. Position jack under load and align to
the lift point suggested by vehicle
manufacturer.
4. Operate jack by pumping the
handle, foot pedal, or squeezing the
lift control valve until saddle
contacts load point. Ensure load is
centered on saddle. Then operate
jack until load reaches desired
height.
Release Knob
Air Control Valve
(for air models only)
Foot Pedal
Saddle
Figure 1 — Hydraulic Service Jack Components
SHI 009
Printed in Taiwan
02/05
