National Crane Published 8-01-2017 Control # 287-11 4-13
NBT40 SERVICE MANUAL BOOM MAINTENANCE
27. Install two top wear pad mounting plates (153), wear
pads (157), with capscrew (156), washer (155) onto the
base of the 2nd stage boom (2).
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
28. Install adjustment cam plate (154), capscrews (156) and
flatwashers (155).
2nd and 1st Section Boom
1. Install one bottom wear pad (106), and shims (105) with
capscrew (129) onto the base of the 2nd stage boom if
replacing.
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
2. 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.
3. Rotate 1st stage cylinder shaft so counterbalance valve
is directly below shaft centerline.
4. Raise and support 2nd/3rd/4th stage booms and install
into 1st stage boom (1) approximately fifteen feet. Take
care to keep 3/2/1 retract cables taunt, not crossing
cables and keeping all cables clear of pinch points
created by slings and bottom pads.
5. Raise 2nd/3rd/4th stage booms against top of 1st stage
boom and install wear pads (165,166) with capscrew
(20) washer (49) into the bottom tip of the 1st stage
boom.
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
6. Lower 2nd/ 3rd/4th stage booms onto wear pads in 1st
stage boom. Push 2nd/3rd/4th stage booms into 1st
stage booms leaving approximately four feet of 2nd/3rd/
4th stage booms sticking out of 1st stage boom.
7. Assemble 3/2/1 retract cable keepers (115) with
capscrew (27) onto 3/2/1 retract cables, double nut
(113,12) just beyond flat on 1/2/3 retract cables (19) and
assemble at bottom tip of 1st stage boom. 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.
8. Install side wear pads (63) wear pad backup plate (22),
back plate (70).
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
9. Install adjusting bolt (104) and jam nut (97) on lower
front side of 1st stage boom. Install wear pad retaining
hardware (28,40,61) in wear pad pocket.
10. Install upper wear pad assembly (164,163,160) with
hardware (162,161) at upper tip of 1st 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.
11. Install top steel spacer pad (16) with shims (101) with
hardware (23,21,56) at the tip of the 1st stage boom,
Loctite capscrews. Shim according to calibration
instructions in this section.
12. Push 2nd/3rd/4th stage booms keeping 3/2/1 retract
cables taunt completely into 1st stage boom or until top
wear pad aligns with the top access hole in 1st stage
boom.
13. Install two top wear pad mounting plates (153), wear
pads (157), with capscrew (156), washer (155) onto the
base of the 2nd stage boom (2).
NOTE: Apply multipurpose grease (MPG) to all wear pads
and contact surfaces.
14. Install adjustment cam plate (154), capscrews (156) and
flatwashers (155).
15. Rotate cam (154) until gap is eliminated between wear
pads and boom section keeping sections centered for
proper boom alignment and tighten clamping hardware.
16. Attach 1st stage cylinder rod to 1st stage hoist mount
with washer (8) and shoulder bolt (11) that has been
torqued and Loctite applied.
17. It is important in this step to have the nuts loose on the 3/
2/1 retract cables (19) at the bottom tip of the 1st stage
boom. Install the 1/2/3 sync extend cables (10) into the
holes at the base of the 1st stage boom, install washer
(8) and double nut (9) just beyond flats.
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.
18. T
orque cables
per the “See “Four Section Cable
Tensioning” on page 4-2” procedure.
19. Install all protective caps on threaded cable ends.
20. Install cable guide (76) with washer (56 and nut (111) to
mounting studs at center top of 1st stage boom (1).
Reference Only
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