Drive Sprocket Rollers
ASV rubber track loaders utilize rollers on the drive
sprockets to drive the track. These rollers help mini-
mize friction between the track and the drive sprocket
to prolong track life.
The rollers rotate around hardened steel pins and usu-
ally wear on their inside surfaces. As they wear, the
rollers become thinner, but will continue to function as
long as they rotate freely around the pins. Sprocket
rollers should be inspected every 50 hours of operation
and replaced if cracked or worn to less than 35% of
original thickness. (.088”)
To replace worn rollers:
1.
Begin by performing steps 1-4 in the track removal
procedure on page 4-6 to allow the sprocket to be
removed.
2.
Remove the seven bearing plate mounting bolts
(A, I), then remove the plate (B) from the drive
table.
3.
Remove the bearing cap (G) by tapping around the
bulged area of the cap with a hammer. This will
relieve the outward pressure on the cap and allow
for removal.
4.
Remove the external snap ring (H) from the bear
ing shaft.
5.
Using a puller, remove the bearing assembly (J)
from the shaft.
6.
Remove the sprocket mounting bolts (C), then
remove the sprocket.
Note:
You may need to pry or lift the track upwards
with a hoist above the drive sprocket to provide clear-
ance for removal.
7.
Remove one bolt (F) holding the steel pins (D) and
rollers (E) in place. Install the new rollers over
the pins, then slide the bolt back through the
sprocket and pins and secure it with the nut (K).
8.
Repeat this process as required throughout the
sprocket.
9.
Reinstall the sprocket by reversing steps 2-6.
Note:
During removal of the bearing cap (step 3) the
bulged area of the cap is beaten inward. When rein-
stalling, orient the cap so that the domed area is facing
outward. Then tap the center of the cap with a ball
peen hammer or similar device to reset the cap. Do
this gently. Too much inward force can damage (mush-
room) the bearing shaft.
10.
Repeat steps 1-9 on the other side of the machine
if necessary.
11.
Perform the track tension adjustment and check
procedures on page 4-4.
Note:
Replace rollers as a set to simplify inspection
and maintain proper sprocket function.
4-5
Rubber Track Loader
4. Maintenance
New Roller Normal Wear
35% life
Steel Pin
(.088”)
A
H
F
E
D
C
SR-70
D
E
F
SR-80
J
I
G
B
K
4-10
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Summary of Contents for ASV SR70
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