45-009 REV. 8/20
20
Locking lug in notch
YXE4C-307
1/2 x 1/2 x 2.00 steel
supplemental
locking lug (optional)
1/16" clearance
Figure 4-5, Welding the optional locking lug
6.
Install the bolt-on lower hooks. Check the clearance between the carriage and
the lower hooks. Loosen the bolts on the front of the hooks, and slide them up or
down so the clearance is no more than 3/32”.
On Class II and Class lll units, tighten the 3/8” bolts to
33 ft-lbs
. On Class lV
units tighten the 1/2” bolts to
77 ft-lbs.
On units using 9/16” UNC bolts, tighten
the bolts to
112 ft-lbs
.
Notice
Make note of any factory-installed spacers or shims.
Shims are used to create clearance between the hook
and carriage.
Maximum
Clearance
1/8"
Maximum
Clearance
1/32"
Class III Shims Shown
Bottom Hook
Spacer
Lower ITA Bar
Figure 4-6, Adjusting bolt-on bottom hooks with spacers
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