SECTION 6: MAINTENANCE
AIR N ARC
®
300 SERIES ALL-IN-ONE POWER SYSTEM
®
PAGE - 88
090012-OP_r0
6.6.10 REBUILDING THE MINIMUM PRESSURE/
CHECK VALVE
Should a condition occur that requires the minimum
pressure/check valve to be serviced (see
Section 7.2,
Troubleshooting Guide
), a repair kit is available. To
repair the minimum pressure/check valve, order
minimum pressure/check valve kit no. 270765. Refer to
Figure 6-14
, and the following procedure:
1. With the machine off and the ignition key
removed, open the hood panel.
2. Locate the minimum pressure/check valve [
A
]
situated on the compressor unit’s control
manifold, close to the coalescer element.
3. Loosen and remove the lock nut [
B
] securing
the grub screw [
C
] in position.
4. Loosen the grub screw [
C
] to relieve any
spring tension in the valve.
5. Loosen and carefully remove the valve body
[
D
], which holds the internal parts in place.
The internal parts will be freed to drop out
with the removal of the valve body.
6. Wipe internal surface of valve body [
D
] with a
clean cloth.
7. Consult
Figure 6-14
, and re-assemble the kit
by replacing all old parts with corresponding
part provided in the kit.
8. Once the kit parts (parts
E
through
L
) have
been situated in correct order into the valve
body, replace the valve body back into the
mounting position. Retighten body securely.
9. Replace the grub screw [
C
] into position on
valve body [
D
], and hand-tighten. Replace
the lock nut [
B
] over the grub screw, and
position it loosely over the grub screw.
6.6.10.1 SETTING THE MINIMUM PRESSURE
VALVE
1. Start the machine and allow it to assume idle
speed.
TOOLS NEEDED
REPLACEMENT
PART(S)
Clean Cloth
Minimum Pressure/
Check Valve
Rebuild Kit No.
270765
Adjustable Wrench
NOTE
Use all of the parts provided in the kit
regardless of the replaceable part’s
condition.
