74
Pneumatic System
Prior to chassis air pressure building to at least 90 PSI, the pump will not be allowed to engage. On
multiplex units, a yellow banner on the Labrie IFM display screen showing “Pump: main air pressure”
and an audible beep will occur if an attempt is made to engage the pump without sufficient air
pressure; on pre-IFM multiplex controlled units the pump will simply not turn on. For
troubleshooting on multiplex equipped units please refer to the appropriate multiplex diagnostic
manual available via labrieplus.com.
If the Labrie-installed air filters are not serviced correctly, this pressure switch may provide
intermittent operation due to debris blocking the intake port of the air pressure switch. When
installing a new pressure switch, special care must be taken to ensure there are no contaminates
introduced to the system that may affect operation of the pressure switch (see
page 65).
If contamination is suspected, remove the air pressure switch from the MAC valve manifold and,
using electrical contact cleaner, clean the air intake port of the pressure switch.
Figure 6
-
12 Air intake port of pressure switch
Next, locate the hole on the back of the pressure switch. Using a 3/32” hex wrench, remove the long,
threaded needle and clean the adjustment port with electrical contact cleaner.
Figure 6
-
13 Servicing pressure switch
Hole
Threaded
needle
Summary of Contents for FEATHERWEIGHT
Page 1: ...STARLIGHT SUPERDUTY MAINTENANCE MANUAL FEATHERWEIGHT ...
Page 2: ......
Page 3: ...STARLIGHT SUPERDUTY FEATHERWEIGHT MAINTENANCE MANUAL ...
Page 5: ......
Page 6: ......
Page 10: ...viii Table of Contents ...
Page 18: ...8 Introduction ...
Page 40: ...30 Safety ...
Page 46: ...36 Lubrication ...
Page 74: ...64 Electrical System ...
Page 90: ...80 Pneumatic System ...
Page 170: ...160 Multiplexing ...