Enerpac Pow'r-Riser PR Serie Manuel D'instructions page 8

Jack Model
1 inch
[25 mm]
PREM_06014L
PRU11
PREM_06027L
PRU11
PREM_10016L PRU11
PREM_10027L PRU11
PREM_15016L PRU151
PREM_15027L PRU151
PREM_20016L PRU201
PREM_20027L PRU201
Note: Fifth letter of model will be B, E, I, G, W, J or R, depending on jack electrical configuration.
5.8 U-Ring Stacking Instructions
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.
Table 7 - U-Ring Information
U-Ring Size and Model Number
3 inch 4-1/2 inch 5-1/2 inch
[76 mm] [114 mm] [140 mm]
PRU13 PRU14 -
PRU13 PRU14 -
PRU13 PRU14 -
PRU13 PRU14 -
PRU153 - PRU155
PRU153 - PRU155
PRU203 - PRU205
PRU203 - PRU205
(See Figure 6)
U-Ring
Set Model
10 inch
Number
[254 mm]
- PRUS126 PRU11
PRU110 PRUS137 PRU11
- PRUS126 PRU11
PRU110 PRUS137 PRU11
- PRUS1526 PRU151
PRU1510 PRUS1537 PRU151
- PRUS2026 PRU201
- PRUS2037 PRU201
Locator (on each
U-Ring and at
top of cylinder
housing)
Steel U-Ring
(bottom)
Load
Cap
Load
Support
Ring
Assembled View
Figure 6, U-Ring Stacking Arrangement (typical)
8
Items Included in Each U-Ring Set
2x 1x 2x
PRU13 PRU14
PRU13 PRU14
PRU13 PRU14
PRU13 PRU14
PRU153 PRU155
PRU153 PRU155
PRU203 PRU205
PRU203 -
Steel U-Ring
Aluminum U-Rings
(top)
Recess of U-Ring
1x 4x
- -
PRU110 -
- -
PRU110 -
- -
PRU1510 -
- -
- PRU205