Manitowoc National Crane NBT40 Series, Service Manual

Page: 86 / 220

BOOM MAINTENANCE NBT40 SERVICE MANUAL
4-12
Published 8-01-2017 Control # 287-11
NOTE: Take care not to cross cables.
NOTE: Do not twist cables. Twisting of cables will result in
d a m a g e o r f a i l u r e o f c a b l e . W h e n i n i t i a l l y
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 (109) on front inside of 2nd stage boom.
12. Install upper wear pad assembly (160,163,164) with
capscrew (162),washer (161) 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 (44), which is on the top tip of the
3rd stage boom into position in the 2nd stage boom and
secure with capscrew (57).
14. Install grease fittings (43) into 1/2/3 extend sheave pins
(47).
15. Install wear pad (58) with shims (102) on inside top front
of 2nd stage boom (2). Install wear pad (33), cable guide
(54) with related hardware (56, 21,55) 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 stage booms into 2nd stage boom until it
bottoms out against cylinder ears. Install capscrew (11),
washer (8) with Loctite to retain the 2nd stage cylinder in
the base of 2nd stage boom.
17. Install the cable wear pad (72) with capscrew (27) on top
of the extend cylinder barrel (5).
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 (152) 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
d a m a g e o r f a i l u r e o f c a b l e . W h e n i n i t i a l l y
assembling threaded ends of cables, thread the
first nut on past the flat so adjustment can be made
later.
20. Lock cable anchor assembly (30) in place with
capscrews (27) through the top and back side plates
with capscrew (118) on the 2nd stage boom. Be sure 1/
2/3 sync extend cables (10) are routed over the top of
the 2/3/4 extend cable anchor.
21. Route three 3/2/1 retract cables (19) around 3/2/1 retract
cable keeper (51) and install on mounting bracket (108)
with capscrew (107) onto 3/2/1 retract cable anchor with
3/2/1 retract cables draped out behind boom.
22. Assemble and install the 3/2/1 retract pin assembly (38)
into anchor plate at the bottom base of the 2nd stage
boom (2).
a. Install one retainer (37) and one washer (36) inside
of each sheave.
b. Install bushing (35) into three groove sheave (114)
and brush with multipurpose grease (MPG) and
install on both ends of pin.
c. Loop 3/2/1 retract cables (19) around three groove
sheaves (114) and retract pin (38) assembly.
d. Install plug (64) in end of pin (38).
a. Install shaft assembly into anchor plates at the base
of the 2nd stage boom pulling threaded ends of 3/2/
1 retract cables (19) towards tip of boom.
b. Install 3/2/1 retract pin keeper setscrews (117)
behind retract pin (38) into base of 2nd stage boom
(2).
c. Install grease fittings (43) toward base of boom.
d. Apply multipurpose grease (MPG) to grease fittings.
23. Install retract cable guides (32), with capscrew (66) into
the base of the 2nd stage boom (2).
24. Install bottom wear pad (106) and shims (105) with
capscrew (129) onto the base of the 2nd stage boom.
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
25. Route the 3/2/1 retract cables (19) between the bottom
of the second stage boom and the bottom pad shims.
26. Install two side wear pads (42) and shims (41) onto the
base of the 2nd stage boom. Shim according to
calibration instructions in this section.
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
Reference Only