JLG 20VP (3120728) Service Manual - Manual (Page 55)

SECTION 2 - SERVICE PROCEDURES
3120728 – JLG Lift – 2-37
9. Once mast section adjustment is completed, apply
loctite #242 to the threads under the (jam) nuts that
were loosened. Then re-tighten the loosened (jam)
nuts until tight against the top (adjust) nut. Chain/
cable should have slight tension but should not be
taut.
Sequencing Cable Adjustment
1. Retract mast completely, and check each sequenc-
ing cable on outside of masts for excessive slack.
Adjust only to remove slack from cable.
2. Tighten nylock-nut just enough to remove excessive
slack from sequencing cable. The springs should
not be compressed more than 25% after adjusting.
3. Run mast through several cycles to verify cable/
chain adjustments and ensure no interference exists
between chain anchor brackets and mast.
Figure 2-22. 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