Manitowoc NATIONAL CRANE 900A User Manual

2 Published 03-23-2017, Control# 641-01
6. 543 retract cables.
Four section boom with two stage cylinder.
Cable tensioning to be in the following order:
1. 321 retract cables
2. 123 extend (synchronizing) cables.
3. 234 extend cables
4. 432 retract cables.
Four section boom with one stage cylinder.
Cable tensioning to be in the following order:
1. 123 extend cables.
2. 321 retract cables.
3. 234 extend cables.
4. 432 retract cables.
Three section boom with one stage cylinder.
Cable tensioning to be in the following order:
1. 123 extend cables.
2. 321 retract cables.
5 - Section Boom w/ 2 Stage Cylinder Cable Positioning
Cable Tightening Sequence 5 Section Boom with Two
Stage Extend Cylinder
Boom must be in horizontal position when adjusting cable
tension (See Figure 2.) Retract boom fully ensuring sections
are bottomed out on section stops 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.
8860-1
FIGURE 2
1/2/3 EXTEND
2/3/4 EXTEND
3/4/5 EXTEND
5/4/3 RETRACT
4/3/2 RETRACT
3/2/1 RETRACT
Reference Only

Manitowoc NATIONAL CRANE 900A Specifications

General

Brand	Manitowoc
Model	NATIONAL CRANE 900A
Category	Construction Equipment
Language	English