16-76. M1089 UPPER ARM REPAIR (CONT)
Upper arm weighs approximately 190 lbs (86
kgs). Attach a suitable lifting device prior to
installation. Failure to comply may result in
injury to personnel or damage to equipment.
Prior to installing retaining pin and retaining
pins covers, ensure upper arm is properly
balanced. Failure to comply may result in
injury to personnel.
Use care not to damage threaded portion on
ends of retaining pin. Failure to comply may
result in damage to equipment.
Step (1) requires the aid of an assistant.
(1) Position upper arm (1) on folding boom frame (2) with
retaining pin (3).
(2) Position upper arm (1) on support (4) with two pin
retaining covers (5), washers (6), lockwashers (7), and
(3) Tighten two screws (8) to 105-115 lb-ft (142-156 N·m).