Manitowoc National Crane NBT30H-2, Service Manual

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BOOM MAINTENANCE NBT30H-2 SERVICE MANUAL
4-16
03-20-2019 Control # 613-06
3. Extend and retract the boom a few times and then
repeat measuring the extension gaps.
The third section should have moved out.
4. Tightening until the extension gap between the first and
second section and the extension gap between the
second and the third are equal.
Retraction
1. Measure the retraction gaps between the first and
second section and the second and third section.
If the retraction gap is greater between the second and third
section than the retraction gap between the first and second
section;
2. Tighten the 321 retract cable located at the front bottom
of the base section the difference in the retraction gap
measurements.
3. Extend and retract the boom a few times and then
repeat measuring the retraction gaps.
The third section should have moved in.
4. Tightening until the retraction gap between the first and
second section and the retraction gap between the
second and the third are equal.
At this time the all extendable sections should extend and
r e t r a c t e q u a l l y a n d b o t t o m o u t a g a i n s t t h e s t o ps
simultaneously.
Cable Retention
Cable Retention Hardware
Nut configuration (see Figure 4-23) will be First Nut
(ADJUSTMENT) and Second Nut (TORQUED).
NOTE: ( OPTION 2 ) method used ONLY when space
constraints prevent OPTION 1 usage.
When tightening/loosening the first (adjustment) nuts on
cables, secure cable using the wrench flats at the front of the
cable ends to prevent cable twist.
After the cable adjustment procedure is completed for the
entire boom assembly. The second (torqued) nut must be
installed on all retract and extend cables.
The second nut should be hand tightened until it comes in
contact with the back of the first nut.
Hold the first (adjustment) nut stationary and a torque
wrench to tighten the second (torqued) nut against the first
(adjustment) nut to the values indicated in TORQUE
VALUES for Second Nut:
FIGURE 4-23
8859-1
3
4
6
5
2
1
8859-2
3
4
5
2
1
OPTION 2
OPTION 1
Item Description
1 Threaded Cable End
2 Nut (Adjustment)
3 Nut (Positive Lock)
4 Setscrew
5 Washer
6 Nut (Torqued)