TM 9-2320-260-34
16-34. CRANE SHIPPER, BOOM, BOOM EXTENSION, AND ROLLERS
MAINTENANCE (M819) (Contd)
m. Middle Lower Roller Assembly
NOTE
q This task may be performed on-vehicle if boom is held up to
upper roller by extending and weighting down end of boom.
q Ensure lifting capacity is greater than weight of shipper.
Failure to do so may result in injury to personnel or damage
to equipment.
q Assistant will help with steps 1 and 2.
1. Hold roller (5) in shipper (4) and install shaft (6) on shipper (4) and roller (5).
2. Aline marked holes in plate of shaft (6) and shipper (4) and install shaft (6) on shipper (4) with new
lockwasher (3) and screw (2).
3. Install grease fitting (1) on shaft (6).
n. Front Lower Roller Assembly and Adjustment
NOTE
q This task may be performed on-vehicle if boom is supported or
removed from shipper. There is not a height adjustment for front
lower roller.
q All personnel must stand clear during lifting operations.
A swinging or shifting load may cause injury to personnel.
q Ensure lifting capacity is greater than weight of shipper.
Failure to do so may result in injury to personnel or damage
to equipment.
1.
Using recorded measurement, assemble two sets of new shims (5) and place shims (5) on roller (6).
2.
Using arbor press, press two collars (4) and bearings (8) on roller (6).
NOTE
Assistant will help with steps 3,5, 7, and 8.
With roller (6) positioned in shipper (10), install two caps (3) on shipper (10) with eight screws (1).
3
Do not tighten screws (1)
Tighten screws (1) on one side of shipper (10) so that cap (3) is fully seated against shipper (10).
4.
While turning roller (6), evenly tighten four screws (1) on other side of shipper (10) until a slight
5.
drag is felt on roller (6).
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