JLG 20VP (3120849) Service Manual - Manual (Page 51)

SECTION 2 - SERVICE PROCEDURES
3120849 – JLG Lift – 2-33
16. Continue installing remaining components to mast
assembly, (i.e. hydraulic pump/motor/reservoir, bat-
tery charger, etc.).
2.10 MAST CHAINS/CABLES AND
SEQUENCING CABLES ADJUSTMENT
Mast Chain/Cable Adjustment
The intention of this procedure is to assure equal load dis-
tribution between the individual chains/cables of a mast
section chain/cable set.
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 platform is at the bottom of travel. Be certain
all chain/cable sets are seated in their sheaves prop-
erly at the top of each mast section.
2. Then with no load in the platform check the side pro-
file of the top of the mast for the amount of adjust-
ment necessary to make the mast sections even for
mast sections-3 and up. (See Figure 2-20.)
NOTE: Mast section-1 is fixed to the base and mast section-
2 is attached to the lift cylinder, these sections
require no adjustment.
Figure 2-20. Mast Chain/Cable/Sequence Cable Adjustment Components.
SECTION-1
FIXED
TO BASE
SEQUENCE CABLE
ADJUST NUT
MAST COVER
SHOWN REMOVED
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
Note: When
pply Loctite #242 to the
threads under the jam nut.
.
chain adjustment
is complete, before
tightening the jam nut
against the adjust nut,
a
SECTION-4
EXTENDED BY
CHAIN/CABLE
SECTION-3
EXTENDED BY
CHAIN
ADJUST UNTIL TOPS OF MAST
SECTIONS ARE EVEN
MAST SIDE PROFILE MAST CHAIN/CABLE ADJUSTERS