Trucks with dual D2 air governors
(One for compessor cut out & one for air dryer unloading)
-a 0-200psi gauge must be installed inline between the D2 compressor governor and the receiver
air tank sense line. (Refer to Plumbing Schematic-Truck With Receiver Tank section in this manu-
al).
-a 0-200psi gauge must be installed into the available ¼” NPT port on the Pressure Protection
Valve opposite of the electric pressure switch. (Refer to Pressure Protection Valve Adjustment sec-
tion in this manual).
-with the TIREBOSS Operator Control Unit turned off, fi rst ensure truck air compressor is set to
135psi, (the pressure that is maintained after the dryer has unloaded and pressure has stabilized).
If truck air compressor is set to 135psi, then check that the wet tank pressure is set at 125psi, (the
pressure at which the dryer unloads). If the pressures are not at the above settings, follow the pro-
cedures listed below.
-these adjustments must be done with the TIREBOSS Operator Control Unit turned off.
-fi rst ensure that the compressor governor cutout is set to 135psi.
-if the truck air compressor is below 135psi. Remove the compressor governor end cap. Loosen
the 7/16” jam nut and with a fl at blade screw driver turn the set screw counter clockwise to
increase the air compressor output pressure (turn only 1/8 turn at a time). Tighten jam nut and
check the air compressor output pressure. Repeat procedure until 135psi is maintained, reinstall
the governor end cap.
-then locate the air dryer governor and ensure that it is set to 125psi.
-if the air dryer governor is below 125psi, remove the governor end cap. Loosen the 7/16” jam nut
and with a fl at blade screw driver turn the set screw counter clockwise to increase the air output
pressure (turn only 1/8 turn at a time). Tighten jam nut and check that the wet tank pressure is at
125psi, by bleeding down the air system until the air compressor engages, pressure rebuilds and
the dryer unloads. Repeat procedure until a min. of 125psi is maintained, reinstall the governor
end cap. To ensure that the governors are functioning properly, pump the brake pressure down no
more then 20psi to ensure that the compressor engages.
-NOTE: some governors are non-adjustable and will have to be changed out with an adjustable
governor.
TIREBOSS
TM
Tire Pressure Control
SERVICE MANUAL
2-2
f:tec\manuals\Service\SERVICEv5.indd - V6-0615
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