JLG sky trak mmv Service Manual page 177

a. Boom Wear Pad Check
10
At ten-hour intervals, check boom wear pad thickness.
Replace wear pads that are less than 3/8" thick (.375" or
9,5 mm). The angled cut (4) at each end of the flat wear
pads serves as a wear pad indicator.
When replacing inner boom wear pads, fill the pockets (5)
of the top rear boom wear pads with multi-purpose
®
grease. Use Loctite 242 (blue) on all wear pad cap-
screws. DO NOT allow Loctite
wear pads.
4
The total thickness of a new flat wear pad (6) is .625" (15,9
mm). The angled cut (7) provides a total wear thickness of
.25" (6,4 mm). This leaves approximately 3/8" (.375" or 9,5
mm) (8) of total unused material. DO NOT allow wear
pads to wear past the angled cut indicator or the metal in-
serts (9) will damage the boom and begin to wear into the
boom pad sliding surfaces. Pads worn past this point will
gouge the boom surfaces, resulting in premature wear of
any new boom wear pads installed and requiring eventual,
expensive replacement of the boom. Replacement of
boom wear pads must be performed when the boom
wear pads indicate.
Model MMV Rev. 12/04
Check
Boom Wear
Pads
MS06002
®
to come into contact with
5
6
When conducting the daily or 10-hour inspection, visually
check the boom wear pads between the boom sections at
the rear and front of the boom for excessive wear, goug-
ing or other damage.
The average expected service life of boom wear pads
varies depending on the particular location of each wear
pad within the boom, vehicle use, load weight and oper-
ating conditions.
If load weights are at or near maximum capacity, or if the
vehicle is operating in very dirty or dusty conditions, the
boom wear pads will wear at a much faster rate.
4
The boom wear pads that are under the most stress from
the weight of the load will also wear faster than other
pads. For example, the lower pads at the front and top
MS0610
pads at the rear of the boom are under much more stress
than the pads attached at the lower rear (channel wear
pads), top front or sides of the boom. Consequently, the
lower pads will require service more often.
7
8
9
Boom
OS12302
4.33