VALVE GP 3T5017 - Caterpillar

Transmission Neutralizer
Neutralizer Pedal And Limit Switch Location
(1) Right brake pedal. (2) Left brake pedal. Large arrow indicates location of neutralizer limit switch (and stop lamp limit switch).Both the right and left brake pedals have the capability to neutralize the transmission while applying the service brakes. A normally closed limit switch is used in the left pedal assembly to activate the transmission neutralizer when the transmission neutralizer lockout switch is in the unlocked (down) position. The limit switch is mounted and adjusted so that it opens when the brake pedal is depressed approximately 6.3 mm (.25 in).
Switch Panel Location
(3) Transmission neutralizer lockout switch in the unlocked (down) position.The transmission neutralizer limit switch located in the left pedal assembly, is connected to a two position rocker switch. The rocker switch is used to either enable or disable the neutralizing function. Transmission neutralizer locknut switch (3), is located on the switch panel to the right of the operator's seat.When the transmission neutralizer lockout switch is in the down position (neutralizer function active), the transmission will shift into neutral and apply the service brakes when either brake pedal is depressed.The transmission is neutralized by de-energizing the direction clutch solenoid, while leaving the speed clutch solenoid energized. This allows full engine power to be used in the hydraulic system.When the transmission neutralizer lockout switch is in the up position (neutralizer function locked out), the service brakes will be applied when either brake pedal is depressed, but the transmission will not shift into neutral. Also, the transmission neutralizer lockout alert indicator located to the left of the four gauge cluster on the dash will turn on. The transmission neutralizer lockout indicator located above the switch illuminates only when the dash (running) lights are turned on.Service Brake Operation
Service Brakes
(1) Axle. (2) Planet carrier. (3) Plate. (4) Disc. (5) Brake oil passage. (6) Piston. (7) Sun gear. (8) Ring gear. (9) Pin (three). (10) Spring (three).All four enclosed service brakes are located in the axle assemblies and actuated by either the left or right brake pedal. There is one service brake on each side of the differential. The service brakes are in both the front and rear axles.Each service brake consists of piston (6), disc (4), plate (3), pins (9), and springs (10).Plate (3) and piston (6) are held stationary by three pins (9) that are fastened in the differential housing and the axle shaft housing. The piston and plate are able to slide on the three pins, but are kept from rotating. Springs (10) keep piston (6) in the retracted position when not being used.Disc (4) has splines on the inside diameter that fit on the splines of sun gear (7). This makes disc (4) rotate at sun gear speed. Grooves are cut into the faces of the disc which permit the passage of cooling oil between the plate and disc, and the piston and disc, even with the brakes applied. Cooling oil will constantly have flow between the disc and plate, and the piston