Service Manual Instruction Manual

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SECTION 2 - SERVICE PROCEDURES

3120782 – JLG Lift – 2-29

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. Also to step each front mast sec-

tion up approximately 1/4 in. (6.5mm) 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 1/4 in. (6.5mm) 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

ANCHOR PLATE

ADJUST NUT

JAM NUT

THREADED

CHAIN/CABLE

END

SECTION-4

EXTENDED BY

CHAIN/CABLE

SECTION-3

EXTENDED BY

CHAIN

STEP APPROXIMATELY

1/4 in. (6.5mm)

MAST SIDE PROFILE

MAST CHAIN/CABLE ADJUSTER

Note: When

ply Loctite #242 to the

threads under the jam nut.

chain adjustment

is complete, before

tightening the jam nut

against the adjust nut,