TM 5-3805-291-23-1
THEORY OF OPERATION - CONTINUED
0003 00
BRAKE AND HYDRAULIC FAN SYSTEM - CONTINUED
j.
A decrease in brake oil pressure causes pressure switch to actuate. Simultaneously, a spool in parking brake control
valve is overcome by spring force in control valve. This spool movement is due to a lack of adequate oil pressure.
With no oil pressure in brake system, actuator engages parking brake.
k.
If brake oil pressure is lost during machine operation, transmission shifts to NEUTRAL; however, transmission
only shifts to NEUTRAL when machine is in either first speed forward or reverse.
l.
A drive-through feature allows an operator to engage transmission in either first speed forward or reverse. This can
be accomplished by first moving transmission direction selector to NEUTRAL, then moving transmission direc-
tion selector to either first speed forward or reverse.
2.
Brake and Hydraulic Fan System Piston Pump.
427-C1752
0003 00-70
