Manitowoc National Crane 800D User Manual

REPAIR 800D
6-18
Published 5-27-2018 Control # 039-06
4- Section Boom w/ 2 Stage Cylinder Cable Positioning
Cable Tightening Sequence 4 Section Boom
with Two Stage Extend Cylinder
Boom must be in horizontal position when adjusting cable
tension (See Figure 6-2.) Retract boom fully ensuring
sections are bottomed out on section stops. Ensure all
sections are fully bottomed out and do not spring
back.(Reference Tensioning Setup Procedure)
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 first and second section is less
than the extension gap between the second and third
section;
2. Tighten 321 retract cable located at the front bottom 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 second 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.
If when tightening the 321 retract cable the third section
starts to go out with the second section the 123
synchronizing cable located at the top back of the base
section may need to be loosened.
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 first and second
section than the retraction gap between the second and third
section;
2. Tighten the 123 synchronizing cable located at the back
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 out.
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.
8860-2
FIGURE 6-2
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
Fo
r
Reference
Only

Manitowoc National Crane 800D Specifications

General

Brand	Manitowoc
Model	National Crane 800D
Category	Construction Equipment
Language	English