AIR N ARC
®
150 SERIES
SECTION 5: MAINTENANCE
090043-OP_r0
(MARCH - 2015)
PAGE - 37
VANAIR MANUFACTURING, INC.
(800) 526-8817 • www.vanair.com
2. Check the deflection of the belt
for looseness by applying
pressure with a finger at the
center location between the
pulleys, as shown in
Figure 5-2
.
The “give” should be in the range
of 3/8 to 1/2 inch for each belt.
COMPRESSOR DRIVE BELT REMOVAL
3. If any number of links needs to be
removed, or if the belt needs to
be replaced, then belt must first
be removed from the pulleys.
Refer to
Figure 5-3
For belt
removal, grip the outer belt with
the right hand while twisting the
belt outward [
A
], and manually
rotate the compressor pulley with
the left hand [
B
]. The belt will
slide free.
4. If belt is too loose, then it will
need to be resized. Consult
Section 5.5.3.4
to re-size a poly
link belt.
5.5.3.4 COMPRESSOR BELT SIZING
When sizing a new compressor drive belt,
first remove the worn belt as explained in
Section 5.5.3.3
, Step #3 and Step #4. Then
consult
Figure 5-4
and the following
procedure:
The poly link belt is placed so that the tab
ends of the links are facing inward, toward
the pulleys.
KEY
DESCRIPTION
A
COMPRESSOR PULLEY
B
COMPRESSOR DRIVE BELT
C
MOTOR SHEAVE
D
OPTIMAL TENSION RANGE: 3/8-1/2 INCH
Figure 5-2: Compressor Belt Deflection
Test
C
A
B
D
IMPORTANT
Over-tightening the compressor poly-link
belt will result in overloading of the
compressor and engine bearing and belt
failure, while a loose belt will be slipping
and result in an unstable speed,
overheating of the belt, and premature
belt failure.
NOTE
Every tenth link is designated with an
arrow of direction ([D] in Figure 5-4).
KEY
DESCRIPTION
A
Twist belt outward while...
B
...rotating compressor pulley
Figure 5-3: Compressor Belt Removal
A
B
