SECTION 2 - SERVICE PROCEDURES
2-32
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2.12 MAST CHAINS/CABLES AND SEQUENCING
CABLES ADJUSTMENT
Mast Chain/Cable Adjustment
The intention of this procedure is to assure equal load distribu-
tion between the individual chains/cables of a mast section
chain/cable set. Also to step each front mast section up
approximately 7/16 in.
(11mm)
from the section behind it to
allow clearance for the individual mast section covers.
Adjust using the following procedure;
1. With mast retracted, step into the platform and bounce
your weight up and down a few times to be certain plat-
form is at the bottom of travel. Be certain all chain/cable
sets are seated in their sheaves properly at the top of
each mast section.
2. Then with no load in the platform check the side profile
of the top of the mast for the amount of adjustment nec-
essary to obtain the 7/16 in.
(11mm)
step for mast sec-
tions-3 and up.
Figure 2-7. Mast Chain/Cable/Sequence Cable Adjustment Components. (Typical)
SECTION-1
FIXED
TO BASE
SEQUENCE CABLE
ADJUST NUT
CHECK IF OVERALL HEIGHT
OF MACHINE FROM
FLOOR TO TOP OF MAST
IS WITHIN SPECIFICATION
SECTION-2
EXTENDED BY
CYLINDER
SECTION-5
(PLATFORM
)
HEADER SECTION
EXTENDED BY
/
CHAIN CABLE
CHAIN CABLE
/
ANCHOR PLATE
ADJUST NUT
JAM NUT
THREADED
/
CHAIN CABLE
END
SECTION-4
EXTENDED BY
/
CHAIN CABLE
SECTION-3
EXTENDED BY
CHAIN
STEP APPROXIMATELY
7/16 in. (11mm)
MAST SIDE PROFILE
MAST CHAIN CABLE ADJUSTERS
/
Note:
When chain adjustment
is complete, before
tightening the jam nut
against the adjust nut,
apply Medium Strength
Threadlocking compound to the
threads under the jam nut.
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