Enerpac PR-Series Electric - Handbuch (Seite 8)

8
5.8 U-Ring Stacking Instructions (See Figure 6)
Pow'r-Riser U-Rings (optional accessories) allow positive
mechanical load holding of a lifted load. The U-Rings are placed
on top of the cylinder housing and around the extended cylinder
rod. They are available in five different lengths for each Pow'r-
Riser model.
To help ensure proper alignment and installation, the top surface
of the cylinder housing and the top surface of each U-Ring
contains a raised locator. The bottom surface of each U-Ring
contains a mating recess.
The U-Rings are made of steel and aluminum. A steel U-Ring
must always be positioned at the top and bottom ends of the
U-Ring stack. The aluminum U-Rings must always be located
in the middle of the stack, between the two steel U-Rings. This
stacking arrangement helps prevent damage to the aluminum
U-Rings.
CAUTION: Never position an aluminum U-Ring at the
top or bottom end of the U-Ring stack.
Install U-Rings as described in the following steps:
1. Using the jack, raise the load to the desired lifting height.
Refer to the instructions in Section 5.5 of this manual.
2. Place one steel U-Ring on top of the cylinder housing,
around the extended cylinder rod.
3. As required, place one or more aluminum U-Rings on top
of the steel U-Ring, around the extended cylinder rod.
The quantity of aluminum U-Rings to be installed will vary,
depending on jack model, lifting height and the U-Ring set
being used. Refer to Table 7 for additional information.
4. Place a second steel U-Ring at the top of the U-Ring stack.
IMPORTANT: Be sure the arrow on each U-Ring is pointing up.
Be sure all locators are fully engaged in the mating recesses of
the U-Rings.
WARNING: Pinch point hazard: In the following step,
keep hands and fingers clear of area between load
support ring and top of U-Ring stack.
5. Slowly lower the cylinder rod until the weight of the load
is supported by the U-Rings. Refer to the information in
Section 5.5 for jack operating instructions.
IMPORTANT: Follow all applicable work rules and regulations
in effect at your facility or worksite. The use of auxiliary stands,
blocking or other additional load supports may be required even
when U-Rings are installed.
Assembled View
Load
Support
Ring
Load
Cap
Steel U-Ring
(top)
Recess of U-Ring
Steel U-Ring
(bottom)
Aluminum U-Rings
Locator (on each
U-Ring and at
top of cylinder
housing)
Figure 6, U-Ring Stacking Arrangement (typical)
Table 7 - U-Ring Information
Jack Model
U-Ring Size and Model Number
U-Ring
Set Model
Number
Items Included in Each U-Ring Set
1 inch
[25 mm]
3 inch
[76 mm]
4-1/2 inch
[114 mm]
5-1/2 inch
[140 mm]
10 inch
[254 mm]
2x 1x 2x 1x
PREM_06014L PRU11 PRU13 PRU14 - PRU110 PRUS126 PRU11 PRU13 PRU14 -
PREM_06027L PRU11 PRU13 PRU14 - PRU110 PRUS137 PRU11 PRU13 PRU14 PRU110
PREM_10016L PRU11 PRU13 PRU14 - PRU110 PRUS126 PRU11 PRU13 PRU14 -
PREM_10027L PRU11 PRU13 PRU14 - PRU110 PRUS137 PRU11 PRU13 PRU14 PRU110
PREM_15016L PRU151 PRU153 - PRU155 PRU1510 PRUS1526 PRU151 PRU153 PRU155 -
PREM_15027L PRU151 PRU153 - PRU155 PRU1510 PRUS1537 PRU151 PRU1510 PRU155 -
PREM_20016L PRU201 PRU203 - PRU155 PRU1510 PRUS2026 PRU201 PRU203 PRU205 -
PREM_20027L PRU201 PRU203 - PRU155 PRU1510 PRUS2037 PRU201 PRU2010 PRU205 -
Note: Fifth letter of model will be B, E, I, G, W, J or R, depending on jack electrical configuration.