JLG 19AMI Service Manual - Manual (Page 44)

SECTION 2 - SERVICE PROCEDURES
2-30 – JLG Lift – 3121190
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.
7. Retract the mast all the way and check if the top of
the mast sections appear as shown in Figure 2-5.
8. Repeat steps (1) through (7) for remaining mast sec-
tions.
9. Run mast through several cycles to verify chain
adjustments and ensure no interference exists
between chain anchor brackets and mast.
10. 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
should have slight tension but should not be taut.
Sequencing Cable Adjustment
(See Figure 2-5.)
1. Retract mast completely, and check each sequenc-
ing cable on the outside of masts for excessive
slack. Adjust only to remove slack from cable.
2. To adjust, tighten the locking nut on the upper end
of the cable (on top of the spring at the sequence
cable bracket located at the top and side of the
mast). Adjust enough to remove excessive slack
from the sequencing cable. Normally the springs
should not be compressed more than 25% after
adjusting.
NOTE: If slack can not be adjusted out of the cable, then the
cable has stretched and must be replaced. See Sec-
tion 2.13, Sequence Cable Replacement Kit, for
cable replacement procedure.
3. Run mast through several cycles to verify cable
adjustments are correct.
2.13 SEQUENCE CABLE REPLACEMENT KIT
A sequence cable replacement kit is available from the
JLG Parts Department to service br oken or worn
sequence cables. This kit consists of a replacement
sequence cable with the threaded (top) end attached
same as the top end of the factory cable. Also included is
a clamp (drum/socket type) to secure the bottom end of
the cable. Use the following procedure to install the
replacement cable and clamp kit.
Remove Old Cable
1. Remove the locking nut from the threaded end of
the cable at the top of the mast and then remove the
spring cap, spring, and spacer washers if installed.
2. Slide the threaded top end out of the upper anchor
bracket, then at the bottom end pull the cable out
though the sheave pulley/anchor bracket until it is
completely clear of the machine.
Replacement Cable Installation
3. Be certain the mast is completely retacted and at the
bottom of travel. Check the mast "Side Profile" at the
top of the mast as shown in Figure 2-5., adjust mast
sections to proper height if necessary.
4. To determine where the clamp will be installed at the
bottom of the replacement cable, temporarily
assemble the new replacement cable to the top
cable anchor bracket on the mast using the wash-
ers, spring, spring cap and lock nut previously dis-
assembled. Thread the lock nut on until
approximately 1/8 in. (3mm) of threads are exposed.
5. At the bottom of the mast, thread the loose end of
the replacement cable through the proper sheave
pulley and through the hole in the sheave pully/
anchor bracket on the mast section ahead of the
sheave pulley.
6. Grasp the cable and pull on the cable until the
spring at the top of the cable is slightly compressed.
Use a black marker to mark the cable on the top
side of the sheave pully/anchor bracket. This will
determine where the clamp (drum/socket) sleeve
will be positioned on the cable.
DO NOT CUT THE CABLE AT THE MARKED POINT ON THE
CABLE THIS IS ONLY USED AS A REFERENCE FOR POSITIONING
THE CABLE SLEEVE WHICH WILL REST AGAINST THE ANCHOR
BRACKET ONCE INSTALLED.