JLG 41AM (3120752) Service Manual - Manual (Page 59)

SECTION 2 - SERVICE PROCEDURES
3120752 – JLG Lift – 2-35
2.11 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. Also to step each front mast sec-
tion 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 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 obtain the 7/16 in. (11mm) step
for mast sections-3 and up. (See Figure 2-7.)
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 Loctite #242 to the
threads under the jam nut.