JLG 15/20MSP Service Manual - Manual (Page 110)

SECTION 5 - MAST COMPONENTS
5-20 – JLG Lift – 3121231
c. Check mast section for side play. If play exists
add .015" shims dividing the thickness equally
between both sides of mast. Insert shims until
the shims cannot be inserted halfway by hand
with the mast pulled to the opposite side.
d. When mast slide pads are shimmed properly,
there should be no side to side movement of
slide pad in rail channel. Mast sections should
be snug in channels but still be able to slide in
channel by hand.
8. Insert slide pads into the slide pad channels (top of
mast) between section-1 and -2, (one on each side
of the mast), with beveled surface facing in towards
section-2.
NOTE: Before fastening and shimming the slide pad on the
top left side of the mast, install a sequence cable
bracket against the mast under the flatwasher.
9. Thread slide pad attaching bolts, two (2) 1/4"-
20UNC x 3/8" long hex head bolts, place a flat
washer under head of each bolt, through holes in
mast section-1 outside rail (top of mast) and into the
slide pad inserts. Thread in enough to hold pad in
place.
10. Shim per instructions in step 7, Mast Section 2 -
Assembly.
11. Lift cylinder installation into the bottom of Mast Sec-
tion 1 and 2.
NOTE: The cylinder rod needs to be extended out of the cyl-
inder approximately 12 in. (30cm) before installation
for later attachment of the upper chain anchor block
to mast section-2. Remove any protective caps on
the extend and return ports temporarily to allow rod
extension. Catch any oil draining out of cylinder to
avoid spillage onto work area. Be careful not to nick
or scour rod surface when extending and during
installation.
12. Slide the lift cylinder into the closed rail side of mast
section-2 and the cylinder mount into mast section-1
closed rail, with the manual descent valve pointing
down towards the back of the mast assembly.
13. Check the mount side to side clearance. Use mount-
ing shims of equal thickness on each side to center
the mount in the closed rail of section-1, if neces-
sary.
14. Install the cylinder mounting reinforcement plates 1
each side and secure the cylinder assembly to the
mast using the cylinder mounting screws and wash-
ers. Apply Loctite #242 to the screw threads before
final tightening.
Mast Top End - Slide Pad Installation (Typical)
1. Slide Pads 3. Sequence Cable Bracket
2. Shim Stock 4. Slide Pad Bolts/Washers (a)
Note: (a) Apply Loctite #242 to threads.
1
4
4
2
3 Lift Cylinder Mount Installation
1. Cylinder Mount 3. Mast Reinforcement Plate
2. Shim Stock 4. Mount Screws/Washers (a)
Note: (a) Apply Loctite #242 to threads.