TIREBOSS
TM
Tire Pressure Control
SERVICE MANUAL
2-3
f:tec\manuals\Service\SERVICEv5.indd - V6-0615
Pressure Protection Valve Adjustment
(System Tests after Installation is complete)
1. Install a 200 p.s.i. test pressure gauge in truck wet tank or spare inlet test port of pressure
protection valve (opposite port to pressure switch). (Adjuster cap on protection valve must be lifted
away from valve to unlock).
2. Close wheel end valves. Remove one end of an drive hose at hanger fi tting.
3. With the truck wet tank at zero pressure, start truck, turn TIREBOSS control “ON” and leave engine
idling. Air will begin fl owing through pressure protection valve and out of hanger at open fi tting.
4. Pressure Protection Valves are backed off completely and need to be set after installation to the truck.
5. Turn the pressure protection valve adjuster cap until the pressure in the wet tank is maintained to
100 psi with a steady fl ow of air coming from the hanger fi tting. When approaching fi nal pressure,
turn adjuster gradually (1/4 turn at a time). Allow time for pressures to stabilize.
6. Reduce brake pressure to 80 psi (no lower) and reconfi rm pressure rebuilds and is maintained to
100 psi in wet tank with truck idling and air fl ow out hanger end. Reinstall drive hose.
7. Open all wheel valves and let stabilize at the lowest pressure setting. When dryers unload at idle,
select the highest pressure setting and confi rm that the pressure does not drop below 80 p.s.i. It is
normal for the tank pressure to swing below the 100 p.s.i. setting and then rebuild and stabilize again.
If pressure drops to 75 p.s.i. it will trigger a “Low Air Supply” alert on the Operator Control Unit. If this
happens increase the protection valve setting slightly (by 2-3 p.s.i.) e.g.. 102 p.s.i. and repeat step 7.
Push down to lock adjuster cap.
8. Confi rm proper operation of Low Air Supply warning on Operator Control display screen. This Low Air
Supply warning should only be activated when truck wet tank pressure is lowered to 75 psi by several
brake applications. Operator Control Unit must be on for this test.
9. After road test, ensure proper adjustment of Pressure Protection Valve following this procedure;
-with truck at lower pressure setting on Operator Control Unit (ie. 60lbs on drives) allow tire pressures
to stabilize
-immediately after dryers unload, with truck at idle, change setting on Operator Control Unit to higher
setting (ie. 100lbs on drives). “LOW AIR SUPPLY” warning should NOT appear on Operator Control
Unit. If “LOW AIR SUPPLY” warning does appear, readjust Pressure Protection Valve. Repeat test
until “LOW AIR SUPPLY” warning does not appear.
10. Shut off truck and remove test gauge and replace plug. Install security cap and security wire. Build
system to maximum pressure and soap leak test all valves and fi ttings.
TRUCK WET
TANK
Compressor Governor
Sensing Line
Supply Line from
Compressor
To Truck Primary
and Secondary
Tanks
Air Supply to
TIREBOSS
Valve Box
Pressure
Protection Valve
Test gauge
(Attach 1/4” line to back of
Pressure Protection Valve,
opposite Pressure Switch)
0
50
100
150
75
25
125
90
3/8” Air Line to
Brake Pressure
Protection Switch
3/8” Compression Fitting
(installed in upright position)
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