Wet Disc Brakes Cooling SystemWet Disc Brakes Cooling System
15C-115C-1TX / TXH / TXB 180S - 400L (Rev. 4/23/07)TX / TXH / TXB 180S - 400L (Rev. 4/23/07)
Introduction.Introduction. The brakes The brakes cooling syscooling system main-tem main-
tains a safe operating temperature by cooling thetains a safe operating temperature by cooling the
hydraulic fluid in the wet disc brake system.hydraulic fluid in the wet disc brake system.
Major ComponentsMajor Components (Illustration 22-1)(Illustration 22-1).. The brakeThe brake
cooling system consists of an auxiliary pump,cooling system consists of an auxiliary pump,
manifold, cooling check valve, various hoses andmanifold, cooling check valve, various hoses and
fittings.fittings.
Auxiliary PumpAuxiliary Pump(Illustration 15-8)(Illustration 15-8).. The The auxiliaryauxiliary
pump is a two section pump with gear sets ofpump is a two section pump with gear sets of
equal size. equal size. The flow of one The flow of one gear set is sgear set is sent toent to
port B1 of the cooling check valve while the flowport B1 of the cooling check valve while the flow
of the other gear set is sent to port P3 of the man-of the other gear set is sent to port P3 of the man-
ifold valve (refer toifold valve (refer to Brake / Brake Cooling LogicBrake / Brake Cooling Logic
inin Section 22Section 22 for a detailed description of man-for a detailed description of man-
ifold flow dedicated to service brake cooling).ifold flow dedicated to service brake cooling).
COOLINGCOOLING
CHECK VALVECHECK VALVE
Illustration 15CIllustration 15C-1. -1. Cooling Check Cooling Check VValvealve
Cooling Check ValveCooling Check Valve (Illustrations 15C-1 and(Illustrations 15C-1 and
15-7)15-7).. The cooling The cooling check valve check valve sends cooling sends cooling fluidfluid
to the servto the service brakes. ice brakes. This valve This valve receives flowreceives flow
from the auxiliary pump at port B1 and the fluid isfrom the auxiliary pump at port B1 and the fluid is
sent out port P1 to cool the right side drive axlesent out port P1 to cool the right side drive axle
brake. brake. The cooling The cooling check valvcheck valve also e also receives flowreceives flow
from the manifold at port P2 and the fluid is sentfrom the manifold at port P2 and the fluid is sent
out port B2 to cool the left side drive axle brake.out port B2 to cool the left side drive axle brake.
This valve also sends fluid from the service brakesThis valve also sends fluid from the service brakes
back to back to the hydraulic the hydraulic tank. tank. In addition, In addition, the coolingthe cooling
check valve contains two 15 psi (1 bar) checkcheck valve contains two 15 psi (1 bar) check
valves that limit the drive axle wheel ends fromvalves that limit the drive axle wheel ends from
seeing no more than 15 psi (1 bar) of pressure,seeing no more than 15 psi (1 bar) of pressure,
protecting the wheel end face seals.protecting the wheel end face seals.
Manifold.Manifold. Refer Refer toto Section 22Section 22for operation offor operation of
the manifold.the manifold.
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