JLG 19BD Service Manual - Manual (Page 67)

SECTION 2 - SERVICE PROCEDURES
3121154 – JLG Lift – 2-45
NEVER WORK UNDER AN ELEVATED PLATFORM UNTIL PLAT-
FORM HAS BEEN SAFELY RESTRAINED FROM ANY MOVEMENT
BY BLOCKING OR OVERHEAD SLING.
5. Start with the mast section which needs adjustment
and loosen the bottom (jam) nut on each chain.
6. Tighten (to raise mast section), or loosen (to lower
mast section) the adjusting nut against the anchor
plate on each chain. Adjust the nut the amount
required to raise or lower the top of the mast section
to match the side profile shown in Figure 2-9. when
the mast is retracted.
NOTE: It is more important that the (threaded ends) studs
protruding through the anchor plates are equal side
to side than it is that the tension in the chains is
equal. The chain equalizer plate will always assure
equal tension, but if the adjustment isn’t equal as
described, the chains may tend to pull to one side or
the other. The threaded end (stud) of the chain may
need to be restrained while tightening the adjust nut
to keep the chain from twisting.
Figure 2-13. Mast Chain/Sequence Cable Adjustment Components. (19BD)
SECTION-1
FIXED
TO BASE
SEQUENCE CABLE
ADJUST NUT
MAST RETRACT
SEQUENCE CABLES
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
CHAIN
ANCHOR PLATE
ADJUST NUT
JAM NUT
THREADED
CHAIN END
(STUD)
SECTION-4
EXTENDED BY
CHAIN
SECTION-3
EXTENDED BY
CHAIN
STEP APPROXIMATELY
1/4 in. (7mm)
MAST SIDE PROFILE MAST CHAIN ADJUSTERS
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