NUT 1S0892 - Caterpillar

Illustration 1 g03124819
(10) Location of the parking brake gp Parking Brake Gp
Illustration 2 g01446763
Location of the components for the parking brake
(1) Spring
(2) Plate
(3) Disc
(4) Bolt
(5) Bolt
(6) Hub
(7) Shaft
(8) Chamber
(9) Plate
(10) Pin
(11) Bearing cage
(12) Piston
(13) Plate The parking brake is positioned on the output transfer gear case. The parking brake is a multiple disc brake with a dry cavity which is engaged by springs (1).Plates (13) react against four pins (10) that are anchored in bearing cage (11). Discs (3) have splines on the inside diameter which engage with hub (6). The hub is splined to shaft (7). The shaft is driven by one of the transfer gears. The discs turn with the transfer gear shaft.Parking Brake Control Knob
Illustration 3 g03160356
Location of the parking brake control knob
(14) Parking brake control knob Parking brake control knob (14) is positioned on the left side of the dashboard. This knob operates the parking brake control valve. The parking brake control knob (14) is connected to the parking brake control valve with a cable.When parking brake control knob (14) is pushed in, oil flows from the accumulators to chamber (8) behind piston (12). Piston (12), plate (9), and bolts (4) are pushed to the left when the oil fills chamber (8). Shaft (7) is able to rotate when the pressure on plates (13) and on discs (3) is released. When parking brake control knob (14) is pulled out, the flow of oil from the accumulator stops. The flow of oil to the parking brake also stops. Oil in chamber (8) drains back to the hydraulic oil tank. Springs (1) then exert force on plate (2). Discs (3) and plates (13) are clamped together. This compression of discs (3) and plates (13) engage the parking brake.When the pressure in the accumulators decreases below 6890 345 kPa (1000 50 psi), the parking brake engages. The position of the control knob indicates the status of the parking brake.Parking Brake Control Valve
Illustration 4 g03141556The parking brake control valve controls the flow of pressure oil for the parking brake actuator.
Illustration 5 g03141576
(2) Port for the hydraulic oil tank
(3) Port for the parking brake actuator
(4) Pressure port that is connected to the accumulator for the rear service brakes
Illustration 6 g03141578
View A-A
(2) Port for the hydraulic oil tank
(3) Port for the parking brake actuator
(4) Pressure port that is connected to the accumulator for the front service brakes
(5) Stem for the brake control valve (parking)
(6) Detent springs
(7) Detent balls
(8) Spool
(9) Retainer
(10) Spring When parking brake control knob (14) is pushed in, the parking brake disengages. This causes spool (8) and retainer (9) to move right. This movement compresses spring (10).This spool movement allows pressure oil to flow into the pressure port from the brake accumulator for the rear service brakes. The oil then flows out of the port for parking brake actuator (3). The oil then flows into a cavity in the actuator assembly for the parking brake.When the oil pressure in the cavity for the parking brake actuator is high enough to compress the