Nexen HGP25 969053 - Manual (Page 9)

9 FORM NO. L-21277-B-1213
Alignment Tool
Part #
Figure 9 GEN B Alignment Tool
a
ddinG
a
dditional
r
ackS
(
continued
)
8. Place the Alignment Tool between the two racks
utilizing the adjacent tooth roots of each rack while
being careful not to damage the rack or alignment
tool. There are two types of alignment tools, Gen B
and Gen A, they are pictured below in Figures 9 and
10 respectively. The tools have different appearances
but provide the same function.
9. It is recommend that both tools are clamped into place
as shown in Figure 11. If clamping is not possible,
both tools can be set by hand by forcefully pressing it
into the rack while securing the rack fasteners. When
the rack joint has been properly set, the alignment tool
should feel solidly seated against its datums, the same
as if it were engaged with teeth in the middle of an
individual rack section. The tool should not be able
to move when a tilting or rocking motion is induced
manually. This should be true whether the motion is
being induced at the joint over the rack teeth or across
the rack faces.
10. Tighten both rack’s screws to 10% of the torque values
in Table 2.
Figure 11
Second Rack
First Rack
Part #
Part #
Figure 12
Alignment Tool
Part #
Figure 10 GEN A Alignment Tool
GEN A ALIGNMENT TOOL PROVISIONS
When joining multiple sections of rack with a GEN A
alignment tool, provisions for an alignment tool mounting
bolts shown in Figure 13 be made if desired.
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 clamping is not possible, 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.
11. If a GEN A alignment tool and it’s fastener provisions
are being used, tighten the alignment tool fastener
screws to the final torque specified in Table 1.
12. Tighten the second rack’s screws 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, 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 12.
15. Repeat Steps 7 through 14 for any additional rack
sections.