BOOM MAINTENANCE NBT40 SERVICE MANUAL
4-26 Published 8-01-2017 Control # 287-11
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
15. Rotate cam (200) until gap is eliminated between wear
pad and boom section keeping sections centered for
proper boom alignment.
4th and 3rd Section Boom
1. Install bottom wear pad (68) and shims (67) capscrew
(69) onto the base of the 4th stage boom (4).
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
2. Install two side wear pads (42) and shims (41) onto pins
at the base of the 4th stage boom. Shim according to
calibration instructions in this section or as pads were
originally removed and tagged.
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
3. Raise and support 4th/5th stage booms and install into
3rd stage boom (3) approximately fifteen feet. Take care
to keep 5/4/3 retract cables (77) taunt, not crossing
cables and keeping all cables clear of pinch points
created by slings and bottom pads.
4. Raise 4th/5th stage booms (4,5) against top of 3rd stage
(3) boom and install wear pads (187), capscrew (186)
into the bottom tip of the 3rd stage boom.
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
5. Lower 4th/5th stage booms onto wear pads in the 3rd
stage boom. Push 4th/5th stage booms into 3rd stage
boom leaving approximately four feet of 4th/5th stage
booms left out of 3rd stage boom.
6. Assemble 5/4/3 retract cable keepers (107) onto 5/4/3
retract cables (77), double nut (151,12) just beyond flat
at threaded end of retract cables and assemble at
bottom tip of 3rd stage boom (3) securing with capscrew
(32).
7. Install lower side wear pads (15) with shims (13,14) on
front inside of 3rd stage boom securing with capscrew
(59).
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
8. Assemble and install upper side wear pad assembly
(178,179,180) securing with hardware (176,177) to tip of
the 3rd stage boom (3).
NOTE: It may be necessary to support the components
with a bar/tool that extends inside the boom section
to aid positioning components during assembly.
9. Install top wear pad (52) with shims (138) and cable
guide (76) with (75),wear pad and related hardware
(146,21,56) on the top front of 3rd stage boom (3). Shim
according to calibration instructions in this section.
10. Push 4th/5th stage booms completely into 3rd stage
boom and scribe a mark in the tip of the 4th stage boom
in front of the side wear pad on the 3rd stage for retract
sequencing. Keep 3/4/5 extend cables (96) and 5/4/3
retract cables (77) taunt and while guiding 3/4/5 extend
cables (96) into anchor plates at upper base of 3rd stage
boom. Thread nuts (86) onto 3/4/5 extend cables (96)
just beyond flats.
NOTE: Install cables in their natural untwisted condition.
Do not twist cables. Twisting of cables will result in
damage or failure of cable. When initially
assembling threaded ends of cables, thread the
first nut on past the flat so adjustment can be made
later.
11. Remove previously assembled 5/4/3 retract cables from
anchor plate at the bottom base of the 5th stage boom
and loop cables back away from base of boom.
12. Pull 5th stage boom out of 4th stage boom
approximately 12 in.
13. Assemble and install extend cylinder assembly.
a. Install bearings (113) into 2/3/4 extend cylinder
sheaves (112).
b. Coat bearing with multi-purpose grease and install
2/3/4 extend sheaves into extend cylinder (6).
c. Install pin assembly (114) through cylinder sheave
case securing with keeper plate (115) and two bolts
(109).
d. Install two wear pads (116 and 119) each side on
front tip of extend cylinder with capscrew (118).
14. Reeve 2/3/4 extend cables (29) over 2/3/4 extend
cylinder sheaves (112) at the front of the telescope
cylinder assembly (6) routing cables behind cylinder in
correct order.
NOTE: Mark cable ends to maintain proper sequence
during assembly to avoid crossing.
15. Install top keeper rod (153) with capscrew (32) and
install rod and roller assembly (153,165) with capscrew
(32) to bottom of extend cylinder sheave case. Install
cable retaining plate (166) and screw (101) to bottom of
extend cylinder sheave case.
NOTE:
Apply multipurpose grease (MPG) to all wear p
ads
and c
ontact surfaces.
16. Install extend cylinder (6) into the rear of the 5th stage
boom leaving approximately two feet extended. Push
5th stage boom completely into the 4th stage boom and
raise extend cylinder to top of 3rd stage boom.
Reference Only
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