SECTION 5: MAINTENANCE
AIR N ARC
®
150 SERIES
PAGE - 36
090043-OP_r0 (MARCH - 2015)
VANAIR MANUFACTURING, INC.
(800) 526-8817 • www.vanair.com
5.5.2 ADJUSTING THE ENGINE SPEED
5.5.3 REPLACING AND RE-TENSIONING
THE COMPRESSOR AND/OR
GENERATOR DRIVE BELTS
The engine drives the compressor and the
generator via the use of two drive belt types.
The compressor utilizes a poly link, chain-
type belt, whereas the generators are driven
by a serpentine v-belt. The belts are
designed for long life, but should periodically
be checked for damage and replaced if
visibly damaged. In addition, over time they
become loose and need to be tightened.
Consult
Section 5.5.3.3
for instruction on
how to check the compressor belt(s) tension.
5.5.3.1 ACCESSING THE DRIVE BELTS -
REMOVING THE BELT GUARD
SHIELD
The belt guard must be removed to access
the drive belts. The Air N Arc 150 Series
system utilizes a poly link series v-belt to
drive the compressor unit, and a serpentine
v-belt to drive the generator system. Refer to
Section 7.7, Belt Guard Assembly
(parts
#1
,
#2
and
#15
) and the following procedure
to access the drive belts:
1. Disconnect the battery ground
cable.
2. Remove the seven (7) truss head
screws and washer pairs
securing the outer shield guard to
the frame.
3. Remove the shield and place it in
a safe location.
5.5.3.2 REPLACING THE BELT GUARD
SHIELD
Replace the belt guard in reverse order of
removal.
5.5.3.3 RE-TENSIONING THE AIR
COMPRESSOR DRIVE BELT
The poly link v-belt used for the compressor
drive does not require a separate tensioner.
Rather, the belt is directly sized by the
amount of links in the belt. Proper tension on
a poly link v-belt is 3/8” to 1/2” give. Consult
Figures 5-2
,
5-3
,
5-4
, and the following
procedure:
1. With the machine off and the
ground wire disconnected from
the battery, remove the belt guard
shield per
Section 5.5.3.1
.
NOTE
DO NOT tamper with the governor setting
to increase the maximum engine speed.
Overspeed is hazardous and will void the
engine warranty. The maximum allowable
high idle speed no load for the engine is
3700 RPM.
WARNING
Relieve pressure from the compressor
system before performing maintenance
on any components.
WARNING
Before performing maintenance or repair
operations on the machine, ensure that
all power has been removed and locked
out to prevent accidental start-up.
WARNING
Never under any circumstances operate
the machine with the belt guard removed.
When performing service with the belt
guard removed, always ensure that the
negative battery cable is disconnected.
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.
