Bobcat 741 - Page 327

TIMING BELT (Cont'd)
Inspection
Check the timing belt sprockets and tensioner for wear,
cracks or damage.
The surfaces of the oil pump sprocket and camshaft
spacer which contact the oil seal must be checked for
wear.
Inspect the tensioner for easy and smooth rotation.
Check for end play and noise.
Check the belt for oil or dust deposits. The slight deposits
must be cleaned with cloth or paper.
DO NOT use solvent
to clean the timing belt.
Check the timing belt
in detail for the following conditions,
replace as needed [A].
1.
Hardened back surface rubber.
2.
Cracked back surface rubber.
3.
Cracked or exposed canvas.
4.
Badly worn teeth (initial stage).
5.
Badly worn teeth (last stage).
6.
Cracked tooth bottom.
7.
Missing tooth.
8.
Side of belt badly worn.
9.
Side of belt cracked.
Added Sept. 90 -70-49-
A
Flaw Conditions
Back surface glossy. Non-elestic and so hard that
even
if a fingernail is forced into it, no mark is
produced.
i.: J
1. ~
2. ~
Crack Crack
3.~ ~~
Separation Separation
Canvas on
load side tooth flank worn. Fluffy
canvas fibers, rubber gone and
color changed to
white, and unclear canvas texture.
4. I/!lJ
Canvas on load side tooth flank worn down and
rubber exposed (tooth width reduced).
5.
6.
7.
IU
Crack ~
Tooth missing
and canvas
JI' fiber exposed
NOTE: Normal belt should have clear-cut sides as
if cut by a sharp knife.
8.
BeltS~
Round ~
~ ~ Abnormal wear
9.
~..... (fluffy canvas fiber)
8-09751
741,742,743, 7430S Bobcat Loader
Service Manual