Mast side profile mast chain adjusters – JLG 19AMI Service Manual User Manual

Page 43

SECTION 2 - SERVICE PROCEDURES

3121190

– JLG Lift –

2-29

To adjust, elevate the platform until the chain anchor
adjust nuts are accessible at the front and bottom of
each mast section.

NEVER WORK UNDER AN ELEVATED PLATFORM UNTIL PLAT-
FORM HAS BEEN SAFELY RESTRAINED FROM ANY MOVEMENT
BY BLOCKING OR OVERHEAD SLING.

Start with the mast section which needs adjustment
and loosen the bottom (jam) nut on each chain.

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 2-5. 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

Figure 2-5. Mast Chain/Sequence Cable Adjustment Components. (Typical)

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

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