Elliott Digger Derrick, Руководство по эксплуатации и техническому обслуживанию, Страница: 216 / 376

Four Section Boom Operation-common EEC-0021 V1.3
Four Section Boom Operation
Inspect top and bottom wear pads periodically for signs of abrasion or excessive
wear. Excessive is defined as 3/16 of an inch (4.8mm) from the original pad thickness,
top rear pad thickness .75 inch (19mm), bottom front 1
st
section 1 inch (25mm), bottom
front 2
nd
and 3
rd
section .44 inch (13mm). Uneven pad wear of 3/32 inch (2mm) from
side to side on the wear pad would be considered excessive as well. If any of these
conditions exist, the top and bottom pads can be replaced without complete
disassembly of the boom.
Top Pad Replacement
Pad maintenance on the four or five section can be made easier by removal of the
winch. Additional clearance can be achieved on the four section by loosening the large
extend cables and removing the extend cable anchor located in the 2
nd
section.

Retract boom completely.

Remove capscrews through access holes on top rear of sections.

Remove wear pads, shims and cam plates from the rear of the boom through
open winch mount end.

Note all pad locations and tags accordingly.

Inspect pads for wear using previously mentioned inspection criteria.

Install new pads through winch mount end of boom. See top pad adjustment
procedure for proper pad and section position.

Torque retainer capscrews to 75 lb-ft (100 N.m). Failure to properly torque
capscrews will cause loss of preload, allowing pad cam to rotate and cause
excessive side clearance between sections.
Front Bottom Pad Replacement

Extend boom approximately 4 feet (120cm) out.

Remove cable guides and upper spacer bars from front of boom sections.

Loosen and remove hex nuts on retract cables on the front of the 1
st
and 2
nd
sections.