STRUCTURAL CD3340B/YB4411
11-6
Published 04/07/2015 Control # 569-00
10. Remove the boom mounting pin and remove the boom
assembly. Place boom on supports capable of handling
the weight of the boom.
11. Disconnect the anti-double blocking wire or RCL wire,
depending on which is installed, from the boom head
and wind it onto the cord reel.
12. If the 1st boom assembly is to be replaced, remove all
external components, i.e. double-blocking cable reel,
boom angle indicator.
Special Tools
Two special tools are required to disassemble and assemble
the 3-section boom. Each tool can be constructed using the
dimensions in Figures 11-7 and 11-8.
Disassembly
Refer to three-section boom assembly diagram at the end of
this manual for all part numbers in this section.
1. At the base of the boom assembly, remove the hoses
from the boom. Cap the fittings at the telescope cylinder
and plug the hoses at the boom.
2. Attach a sling and overhead crane to the pivoting boom
head (66). Remove lynch pin (5) and pin (4). Remove
capscrew (7) and lockwasher (8). Remove pin (6) and
the pivoting boom head (66).
3. At the front end of the second boom assembly remove
eight capscrews (42), lockwashers (41) and four bronze
wear pads (40). If wear pads (40) are to be reinstalled,
make note as to which wear pad, and shims (67), if
installed, were removed from which location.
4. At the front of the 3rd boom assembly, remove eight
capscrews (48), lockwashers (47) and four bronze wear
pads (46). If wear pads are to be reinstalled, make note
as to which wear pad, and shims (68), if installed, were
removed from which location.
5. Remove nut (65) from threaded chain end (63). Slide
chain end (63) out the 1st boom section and let it hang
free.
6. At the base end of the 1st boom assembly, remove
cotter pin (57) and castle nut (56) from extend rod (24).
Remove cotter pin (58), castle nut (59) and washer (60)
from end of cylinder. Do not turn extend rod (24) out of
chain end (23) at this time.
7. Secure the boom assembly so it does not pull off the
supports. Attach an overhead crane and sling to the 2nd
boom assembly. Pull the 2nd and 3rd boom sections out
of the 1st boom section approximately half way. Remove
four capscrews (51), lockwashers (50) and two boom
slide pads (49). Continue pulling the 2nd and 3rd boom
section out of the 1st boom section until it stops and
retract roller assembly (37) is visible through the front
access holes of the 1st boom section.
8. Remove two capscrews (39) and lockwashers (38) from
retract roller assembly (37).
9. When the retract roller assembly is free, pull the 2nd
boom section out the end of 1st boom section. When
free, disconnect lower retract chain (26) from the chain
end (31) by removing pin (28) and cotter pins (27).
10. Remove retract roller assembly (37) from the 1st boom
section.
11. Place the 2nd boom assembly on supports capable of
handling the weight.
12. With the 2nd boom assembly supported, remove the two
capscrews (32) from eccentrics (33). Remove the
eccentrics.
WARNING
The next step requires pulling on the boom assembly. To
inhibit the boom assembly from pulling off of the supports,
secure the boom assembly. Should the boom be pulled off
of the supports, personal injury could occur.
Reference Only
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