7
5.7 Caster Wheels
Figure 7, Caster Wheels
Caster wheels are mounted at the
top end of the upper handle. They
allow the jack to be tilted back and
pushed or pulled to the desired
work location. The caster wheels
can also be used to help maneuver
the jack when it is being positioned
under the jacking point.
For best results, the upper handle
should be adjusted to the most
upright (vertical) position before
using the caster wheels.
5.8 Lifting and Supporting the Jack
Two lifting eyebolts are located on the cylinder housing. Use only
these eyebolts when it is necessary to lift or support the jack
for any reason. Always use a suitable lifting device of adequate
capacity. Refer to Section 2.0 for jack weights.
WARNING
Never use the handle assembly to lift or
support the jack. The handle assembly is not designed for
this purpose. Jack will drop if failure of handle assembly
occurs. Death, serious personal injury and/or property
damage may result.
Figure 8, Lifting Eyebolts
Lifting
Eyebolt
Lifting
Eyebolt
6.0 OPERATION
6.1 Jacking Safely
You must know the weight of what you intend to lift and choose
a jack with
at least 20 percent
additional capacity.
Before operating the jack, refer to the Pow’R Lock Use Guidelines
Supplement (Enerpac document L4131) for important lifting
information and precautions.
All persons operating the jack should obtain and be familiar with
the
American National Standards Institute
rules that apply to
hydraulic rams and jacks (ASME ANSI B30.1) or the equivalent
standards used in your country or region.
WARNING
Failure to observe and comply with the following precautions
could result in death or serious personal injury:
• Never place any part of your body under the load at any
time while lifting or lowering is in progress. The load could
drop suddenly if it becomes unstable.
• Never leave the jack unattended during operation, even
for a brief period of time. Closely monitor jack operation
at all times and be prepared to stop lifting or lowering
immediately. Load could drop if it is not monitored while
jack is in use.
• Avoid placing external forces on the lifted load while it
is being supported by the jack. The load may become
unstable and fall.
• Do not use the jack outdoors in windy conditions.
Changes in wind direction or velocity could cause the load
to become unstable and fall.
• When lifting with more than one jack, be especially careful
to keep the load level. Leveling is best accomplished by
throttling with the air shut-o
ff
valve or by alternating and
stopping jacks to keep the load level enough so it remains
stable and does not drop.
• Never operate the jack with the jack front access cover
raised or removed. Serious personal injury could result
if fi ngers, hands or other body parts become entangled
in the lock nut drive chain mechanism, or in the cylinder
threads.
6.2 Calculating Load Floor Pressure Requirements
Before the jack is used, it must be verifi ed that the surface
below the jack is capable of supporting the load. The following
calculation will determine the approximate maximum pressure
that will be exerted by the jack against the surface of the fl oor or
ground, based on the load being lifted.
WARNING
If any doubt exists regarding whether the
fl oor and/or ground can safely support the load to be lifted,
the jack should not be used in that location. Avoid using jack
on overburden or ballast that can shift or crush under load.
Consult a qualifi ed professional, such as a licensed civil
engineer or building architect If there are any questions
or concerns regarding load fl oor pressure requirements.
Failure to observe this instruction may cause an unstable
lifting arrangement, resulting in loss of load, personal injury
and/or property damage.
6.2.1 LOAD FLOOR PRESSURE CALCULATION:
Weight of Load x Load Factor = Load Floor
Pressure Requirement
• The load factor to be used for the imperial system is
0.0125
.
• The load factor to be used for the metric system is
0.00194
.
These load factors are applicable to all Pow’R-LOCK ™ jack
models.
EXAMPLE:
For a 100000 pound [45359 kg] load, the following equations
would apply:
Imperial System: 100000 x 0.0125 = 1250 psi
Metric System: 45359 x 0.00194 = 87.99 kg/cm
2
NOTICE
The jack is designed to withstand only a limited amount
of side loading. Excessive side loading will reduce the jack's
e
ff
ective foot print on the load fl oor and will increase the jack
contact pressure. Damage to jack components may occur.
