Enerpac PR-Series Electric - Handbuch (Seite 6)

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5.4 Jacking Safely
You must know the weight of what you intend to lift and choose
a jack with at least 20 percent additional capacity.
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: Never place any part of your body under
the load at any time while it is being lifted, lowered or
hydraulically supported by the Pow'r-Riser jack.
WARNING: The Pow'r-Riser jack should not be used to
hydraulically support the load for any period of time
after the lift has been completed. Support the load with
Enerpac U-Rings (optional accessory) or appropriately rated load
supports immediately after it has been lifted to the desired height.
WARNING: Never leave the Pow'r-Riser 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.
WARNING: Do not use the Pow'r-Riser jack outdoors in
windy conditions. Changes in wind direction or velocity
could cause the load to become unstable or fail.
5.5 Operating Instructions (See Figures 3, 4 and 5)
TO RAISE THE LOAD:
1. Be certain that the jack is positioned on a solid and level
surface, capable of supporting the load and the base of the
jack. Be sure that the lifting cylinder is perpendicular to the
ground. Refer to Section 4.4 for additional jack positioning
instructions.
2. If a high jacking point requires a taller jack, install extensions
and spacers (optional accessories) on the cylinder as
required. Refer to Section 5.6 for installation instructions
and additional information about extensions and spacers.
3. Place a piece of good quality plywood or other compression
material (approximately 1/4" [6,3 mm] thick with high friction
characteristics) between the cylinder load cap and the
jacking point. This will provide a small amount of cushioning
and will also help prevent damage to the jacking point.
4. To raise the load, move the control valve lever to the advance
position. Then, depress the pendant button to start motor
and advance cylinder.
CAUTION: When lifting with more than one jack, be
especially careful to keep the load level. Leveling is
best accomplished by alternately starting and stopping
the jacks to keep the load level enough so it remains stable.
5. When load has reached the desired height, release the
pendant button and move the control valve lever to the
center (neutral/hold) position.
6. Be sure that the proper Enerpac U-Rings are installed on
the cylinder (refer to Section 5.8 for U-Ring installation and
stacking instructions). If U-Rings are not used, be sure that
other load supports of appropriate load rating are in place.
7. Move the control valve lever to the retract position. Depress
the pendant button and allow the load to lower until it is
supported by the U-Rings or load supports. Then, return the
lever to the center (neutral/hold) position.
WARNING: After lifting is completed, always support
the load using the proper Enerpac U-Rings or
appropriately rated load supports. Never rely on the
cylinder's hydraulic pressure to support the lifted load.
WARNING: Wait an appropriate amount of time before
working under the load after it is supported by U-Rings
or load supports. Any settling of jack base or load
supports into the ground below must not exceed 1/4 inch [6.4
mm]. If additional settling occurs, reposition jack or load supports
on solid ground.
TO LOWER THE LOAD:
1. Move the control valve lever to the advance position.
2. Depress the pendant button and allow the cylinder to
advance a small amount, so that the load is lifted off of
U-Rings or clears the load supports. Then place the control
valve lever in the center (neutral/hold) position.
3. After the U-Rings or load supports are removed, move
the control valve lever to the retract position. Depress the
pendant button to retract the cylinder.
CAUTION: Be careful while lowering to ensure that the
load is lowered evenly, so that load shifting does not
occur.
4. When load has been fully lowered, place the control valve
lever in the center (neutral/hold) position.
AFTER COMPLETING THE JOB:
Fully retract the cylinder. Disconnect power cord from electrical outlet.
Remove any extensions or spacers from the cylinder. Place
U-Rings (if used) on the storage racks provided on the jack.
Always store the jack and its accessories in a clean and dry area,
free of moisture and direct sunlight.
5.6 Stacking Instructions - Extensions and Spacers
(See Figure 5)
Extensions and spacers are available as optional accessories
from your Enerpac authorized distributor. They may be ordered
individually or in sets. Refer to tables 3 and 4 for additional
information.
PRE Series extensions allow the jack's useful lifting height to
be increased in increments of 5, 7, 9 or 11 inches [127, 178,
229 or 279 mm]. On short stroke Pow'r-Riser models only, larger
extensions can also be used, allowing the useful lifting height to
be increased in increments of 14 or 18 inches [356 or 457 mm].
Table 3 - PRE Series Extensions (optional accessories)
Extension
Model
Thickness (each)
inches mm
PRE5 5 127
PRE7 7 178
PRE9 9 229
PRE11 11 279
PRE14 * 14 356
PRE18 * 18 457
PRES6024
Extension Set
Includes PRE5, PRE7, PRE11 and PRE18 (1 each).
* For use on short stroke jacks only (models ending in “14L” or “16L”)
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