BOOM MAINTENANCE NBT40 SERVICE MANUAL
4-28 Published 8-01-2017 Control # 287-11
b. Slide the keeper sheave (71) into this slot from back
to front so raised portion of sheave slides into slot of
cable anchor plate.
c. Pull this loop of cable forward to lock 1/2/3 sync
extend cable (10) to 3rd stage boom.
d. Place the sheave case assembly (44) on top front
of 3rd stage boom with its top bar up and forward.
e. Loop both threaded ends of sync extend cable (10)
toward back of boom to form two loops, left and
right, at front of boom. Slide left and right loops into
left and right sides of sheave case assembly.
f. Install bearings (45) in sheaves.
g. Brush with chassis grease.
h. Install flattened end pins (47) in sheaves.
NOTE: Insure grease feed holes face toward the back of
the boom.
i. Slide pins (with sheaves) into slots in front of sheave
case assembly (44). Fold back and position
assembled sheave case on top of boom sections
during assembly of next boom stage.
j. Route and pull threaded ends of sync extend cable
(10) toward base of boom and loop over base of
boom.
7. Insure 2nd stage extend cylinder ears (6) are horizontal.
8. Raise and support 3rd/4th/5th stage booms and install
into 2nd stage boom (2) approximately fifteen feet.
NOTE: Take care to keep 4/3/2 retract cables taunt, not
crossing cables and keeping all cables clear of
pinch points created by slings and bottom pads.
9. Raise 3rd/4th/5th stage booms against the top of the
second stage boom (2) and install wear pads (17) with
capscrew (186) into the bottom tip of the 2nd stage
boom.
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
a. Lower 3rd/4th/5th stage booms onto wear pads in
the 2nd stage boom.
b. Install 3rd/4th/5th stage booms into stage boom
leaving approximately four feet of 3rd/4th/5th stage
booms left out of 2nd stage boom.
10. Assemble 4/3/2 retract cable keeper plate assemblies
(26) with capscrew (27) onto 4/3/2 retract cables (53).
Install double nut (151,12) just beyond flat on 4/3/2
retract cables and assemble at bottom tip of 2nd stage
boom (2).
NOTE: Take care not to cross cables.
NOTE: 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. Install lower side wear pads (15), shims (13,14) with
capscrew (26) on front inside of 2nd stage boom.
12. Install upper wear pad assembly (180,179,178) with
capscrew(176),washer (177) at upper tip of 2nd stage
boom.
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.
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
13. Slide the previously assembled 1/2/3 extend cable
sheave case assembly (which is on the top tip of the 3rd
stage boom) into position in the 2nd stage boom.
14. Install grease fittings (43) into 1/2/3 extend sheave pins
(47).
15. Install wear pad (58) with shims (137) on inside top front
of 2nd stage boom (2). Install wear pad (33), cable guide
(54) with related hardware (56, 21,55,117,57) on the top
front of 2nd stage boom (2). Shim according to
calibration instructions in this section.
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
16. Push 3rd/4th/5th stage booms into 2nd stage boom until
it bottoms out against cylinder ears. Install capscrew
(1
1), washer (8) with
Loctite to retain the 2nd stage
cylinder in the 2nd stage boom.
17. Install the cable wear pad (72) with capscrew (27) on top
of the extend cylinder barrel (6).
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
18. Install the extend cylinder into the slots at the base of the
3rd stage boom. Install keepers (50) with capscrew (48),
washer (49) with Loctite to retain the 2nd stage cylinder
in the 2nd stage boom.
19. Install wear pad (39) on top of 2/3/4 extend cable anchor
assembly (30), then install 2/3/4 extend cable anchor
assembly in slots at base, top of 2nd stage boom (2)
while guiding 2/3/4 extend cables (29) into anchor
assembly (30). Install nuts (31) and spacer (87) on
threaded ends of 2/3/4 extend cables (spacer is used on
center cable only).
NOTE: Do not twist cables. Twisting of cables will result in
damage or failure of cable. When initially
assembling threaded ends of cables, thread the
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