AIR N ARC
®
150 SERIES
SECTION 5: MAINTENANCE
090051-OP_r0 (FEB-2014)
PAGE - 33
Vanair Manufacturing, Inc.
vanair.com • 800-526-8817
Figures 5-1
,
5-2
,
5-3
, and the following
procedure:
1. With the machine off and the
ground wire disconnected from
the battery, remove the belt guard
shield per
Section 5.5.2.1
.
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 5-1
.
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 5-2
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 5.5.2.4
to re-size a poly-
link belt.
5.5.2.4 COMPRESSOR BELT SIZING
When sizing a new compressor drive belt,
first remove the worn belt as explained in
Section 5.5.2.3
, Step #3 and Step #4. Then
consult
Figure 5-3
and the following
procedure:
IMPORTANT
The compressor drive belt is tensioned
by the number of links in the belt. Never
attempt to adjust the compressor belt
tension by repositioning either the
compressor unit or the engine from its
mounted position, as these components
are alignment-set at the factory.
KEY
DESCRIPTION
A
COMPRESSOR PULLEY
B
COMPRESSOR DRIVE BELT
C
MOTOR SHEAVE
D
OPTIMAL TENSION RANGE: 3/8-1/2 INCH
Figure 5-1: Compressor Belt Deflection
Test
C
A
B
D
IMPORTANT
Over-tightening the compressor poly-link
belt will result in overloading of the
motor and belt failure, while a loose belt
will be slipping and result in an unstable
speed, overheating of the belt, and high
amp draw.
KEY
DESCRIPTION
A
Twist belt outward while...
B
...rotating compressor pulley
Figure 5-2: Compressor Belt Removal
A
B
