National Crane 600H, Руководство по обслуживанию

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NATIONAL CRANE
08-19-2022 Control # 092-13
4-21
600H SERVICE MANUAL BOOM
4
4- Section Boom w/ 1 Stage Cylinder Cable Positioning
Cable Tightening Sequence 4 Section Boom with (1)
Stage Extend Cylinder
Boom must be in horizontal position when adjusting cable
tension (See Figure 4-10.) Retract boom fully ensuring
sections are bottomed out on section stops. Ensure all
s e c t i o n s a r e f u l l y b o t t o m e d o u t a n d d o n o t s p r i n g
back.(Reference Tensioning Setup Procedure pg 4-16)
321 and 123 cable balancing
Extension
1. Measure the extension gaps between the first and
second section and the second and third section.
If the extension gap between second and third section is less
than the extension gap between the first and second section;
2. Tighten 123 extend cable located at the back top of the
base section the difference in the extension gap
measurements.
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 second and first extendable sections should
extend and retract equally and bottom out against the stops
simultaneously.
234 and 432 cable balancing
Extension
1. Measure the extension gaps between the third and
fourth section and the second and third section.
If the extension gap between third and fourth section is less
than the extension gap between the second and third
section;
2. Tighten the 234 extend cable located at the back top of
the second section the difference in the extension gap
measurements.
3. Extend and retract the boom a few times and then
repeat measuring the extension gaps.
The fourth section should have moved out.
4. Tightening until the extension gap between the third and
fourth section is equal to the extension gap between the
second and third section.
8860-3
FIGURE 4-10
1/2/3 EXTEND
2/3/4 EXTEND
4th STAGE
4/3/2 RETRACT
3/2/1 RETRACT
3RD STAGE
2ND STAGE
1ST STAGE
BASE
TIP
REFERENCE ONLY