Nexen RPG25A-GE486T 966740 - Manual (Page 9)

9 FORM NO. L-21235-G-0413
Alignment Tool
Part #
Figure 7 GEN B ALIGNMENT TOOL
Alignment Tool
Part #
Figure 8 GEN A ALIGNMENT TOOL
The bolt can either pass through the alignment tool
from the top and thread into the machine bed or pass
through the machine bed and thread into the alignment
tool. See Table 1 for bolt sizes depending on method
chosen.
If fastening the alignment tool in place is not possible
or in the case of GEN B, it can also be clamped in
place by placing a small piece of flat stock across the
two alignment tool pins on each rack end and clamping
them down by some other provision.
If fastening or clamping is not possible or in the case
of GEN B, the alignment tool can be manually seated
across the rack joint while pressing it forcefully into
the rack. When the adjacent rack section is properly
spaced, the alignment tool will feel solidly seated when
alternately pushing down on opposite ends of the tool.
If not using the bolt down method, skip to Step 12.
9. Fasten the Alignment Tool to the mounting surface
using customer supplied fasteners while making sure
the face of the alignment tool is fully seated against
the rack face and tighten to the initial torque value in
Table 1.
10. Tighten the second rack’s bolts to 10% of the torque
values in Table 2.
11. Torque the alignment tool to the final torque specified
in Table 1.
12. Torque the second rack to 50% of the torque listed
in Table 2 working from the middle of the rack to the
ends. Then repeat with 100% torque, as specified in
Table 2.
13. Carefully remove the alignment tool, while avoiding
any damage to the rack or alignment tool.
14. Starting on the first rack perform the tooth peak
variance check and extend it to the second rack as
covered in step 6. If the tooth peak variance on the
second rack is out of specifications shim it to match
the first rack. Always reference the runout of additional
rack sections against the first rack installed at the high
point in the run as shown in Figure 9.
15. Repeat Steps 7 through 14 for any additional rack
sections.
Second Rack
First Rack
Part #
Part #
Figure 9
GEN A ALIGNMENT TOOL PROVISIONS
When joining multiple sections of rack it is recommended
that the provisions shown in Figure 10 be used whenever
possible.
In some applications this may not be practical. In these
cases the GEN A alignment tool can be clamped in place
by placing the alignment tool in position across the rack
joint and laying a flat steel bar across the pins and clamping
against the steel bar.
If clamping is not possible or in the case of GEN B, the
alignment tool can be manually seated across the rack
joint while pressing the pins forcefully into the rack teeth.
When the adjoining rack section is properly spaced, no
movement should be felt when alternately pushing down
on opposite ends of the alignment tool.