BOOM MAINTENANCE NBT40 SERVICE MANUAL
4-10 Published 8-01-2017 Control # 287-11
NOTE: Take care not to damage cables.
2. Install bottom wear pad (68) and shims (67) capscrew
(69) onto the base of the 4th stage boom (4) if replacing.
3. 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.
4. Raise and support 4th stage booms and install into 3rd
stage boom (3) approximately fifteen feet.
5. Raise 4th stage boom (4) against top of 3rd stage (3)
boom and install wear pads (17) with capscrew (167)
into the bottom tip of the 3rd stage boom.
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
6. Lower 4th stage boom onto wear pads in the 3rd stage
boom. Push 4th stage boom into 3rd stage boom leaving
approximately four feet of 4th stage boom left out of 3rd
stage boom.
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
(164,163,160) securing with hardware (161,162) 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 (100) and cable
guide (76) with (75),wear pad and related hardware
(103,21,56) on the top front of 3rd stage boom (3). Shim
according to calibration instructions in this section.
10. Push 4th stage boom 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.
11. Pull 4th stage boom out of 3rd stage boom
approximately 12 in.
12. Assemble and install extend cylinder assembly (5).
a. Install bearings (84) into 2/3/4 extend cylinder
sheaves (83).
b. Coat bearing with multi-purpose grease and install
2/3/4 extend sheaves into extend cylinder (5).
c. Install pin assembly (142) through cylinder sheave
case securing with keeper plate (150) and two bolts
(81).
d. Install two wear pads (144 and 145) each side on
front tip of extend cylinder with capscrew (143).
13. Reeve 2/3/4 extend cables (29) over 2/3/4 extend
cylinder sheaves (83) at the front of the telescope
cylinder assembly (5) routing cables behind cylinder in
correct order.
NOTE: Mark cable ends to maintain proper sequence
during assembly to avoid crossing.
14. Install top keeper rod (146) with capscrew (151) and
install rod and roller assembly (146,147) with capscrew
(151) to bottom of extend cylinder sheave case. Install
cable retaining plate (148) and screw (149) to bottom of
extend cylinder sheave case.
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
15. Install extend cylinder (5) into the rear of the 4th stage
boom leaving approximately two feet extended. Push
4th stage boom completely into the 3rd stage boom and
raise extend cylinder to top of 3rd stage boom.
16. Assemble and install the 4/3/2 retract-2/3/4 extend pin
assembly into anchor plate at the bottom base of the 4th
stage boom (4).
a. Assemble 3 extend cables (29) on the 4/3/2 retract-
2/3/4 extend pin (77).
b. Install one washer (60) and one retainer (99) on
each side of the outer cables.
c. Install plug (64) in end of pin.
d. Install shaft assembly into retainer at base of 4th
stage boom.
e. Install grease fittings (43) toward base of boom.
f. Apply
multipurpose grease (MPG) to grease fittings.
17. Lower extend cylinder
and push into 3rd stage boom
keeping cables taunt to approximately one foot behind
cylinder anchors in the 3rd stage boom. Raise base of
extend cylinder to top of 3rd stage boom.
18. Install wear pad (112) with capscrews (107) at the base
of the fourth stage boom.
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
19. Route the two 4/3/2 retract cables (53) evenly centered
around the 4/3/2 retract cable keeper (78). Route
threaded ends of 4/3/2 retract cables (53) down through
the opening in the base of the 3rd stage boom and pull
threaded ends of 4/3/2 retract cables toward tip of boom
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