TM 9-2320-260-34
16-34. CRANE SHIPPER, BOOM, BOOM EXTENSION, AND ROLLERS
MAINTENANCE (M819) (Contd)
L Upper Roller Assembly and Adjustment
1.
Place two spacer plates (9) on dowel pins (8) and, with holes in opposite roller (7) alined with dowel
pins (8), push rollers (7) together.
Install shaft (10) on two rollers (7).
2.
NOTE
Assistant will help with steps 3, 5 ,7, and 8.
With rollers (7) and shaft (10) positioned in housing (3), install two caps (1) on housing (3) with eight
3.
screws (5). Do not tighten screws (5).
Tighten screws (5) on one side of housing (3) so that cap (1) is fully seated against housing (3).
4.
While turning rollers (7), evenly tighten four screws (5) on other side of housing (3) until a slight
5.
drag is felt on rollers (7).
6.
Using feeler gage, measure gap (11) and assemble two sets of new shims (2), each being equal in
thickness to one-half the measured thickness of gap (11).
Remove eight screws (5) and two caps (1) from housing (3).
7.
With rollers (7) and shaft (10) positioned in housing (3), install required number of new shims (2)
8.
and two caps (1) on housing (3) with eight new lockwashers (4) and screws (5).
Measure distances "A" and "B" between flange of rollers (7) and inside of housing (3). Record
9.
measurements. Distances "A" and "B" are correct if measurements are the same.
NOTE
If the distances "A" and "B" do not measure the same, perform
steps 10 through 13 to center rollers in housing.
Remove eight screws (5) and lockwashere (4) from caps (1) and housing (3).
10.
11.
Remove cap (1) on side with longer distance measured, and remove shims (2) from cap (1) equal in
thickness to one-half the difference of distances "A" and "B."
12.
Remove other cap (1) and place thickness of shims (2) removed in step 11 on cap (1).
Perform step 8.
13.
14.
Install two grease fittings (6) on caps (1).
Install upper roller assembly on shipper (subtask p.) if performing this task on-vehicle.
15.
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