MANIFOLD-EXHAUST 2828591 - Caterpillar

Illustration 1 g03496470
(1) Priority valve
(2) Screen
(3) Pressure relief valve gp
(4) Orifice
(5) Solenoid valve group (brake accumulator charge)
(6) Solenoid valve group (hydraulic fan)
(7) Orifice
(8) Pressure sensor
(9) Shuttle valve group
(10) Pressure sensor
(11) Tank port
(12) Fan port
(13) Brake accumulator (right)
(14) Check valve
(15) Brake accumulator (left)
(16) Shuttle valve
(17) Load sense
(18) Pump The control manifold controls the brake and the hydraulic fan system. The brake system has priority over the hydraulic fan system. The fan system is only used on demand.Operation of the Brake System
Operation Below Brake Cut-In Pressure
Illustration 2 g03498741
(1) Hydraulic tank
(2) Brake control valve group
(3) Return filter
(3C) Filter bypass
(4) Brake accumulator
(5) Brake accumulator
(6) Pressure sensor one
(7) Pressure sensor two
(8) Block
(9) Control manifold group
(9A) Relief valve
(9B) Check valve
(9C) Screen
(9D) Priority valve
(9E) Solenoid valve group (hydraulic fan)
(9F) Shuttle valve
(9G) Solenoid valve (Brake charge)
(9H) Inverse shuttle valve
(9J) Orifice
(10) Hydraulic oil cooler
(11) Cooler bypass valve
(12) Temperature sensor
(13) Check valve
(14) Fan motor
(15) Fan and Brake pump
(16) Pump control valve
(16A) Margin adjustment
(16B) High pressure cut-of adjustment
(A) Load sense port
(B) Load sense test port
(C) Pump discharge test port
(D) Pump entry port
(E) Tank return port
(F) Accumulator port
(G) Accumulator port
(H) Pressure sensor port
(J) Pressure sensor port At machine startup when the accumulators are empty or when pressure sensor (6) and pressure sensor (7) sense that the brake system pressure has reached the pre-determined cut-in, brake charge solenoid (9G) will be in the yellow position shown. This high-pressure signal is sent to pump (15) causing the pump to upstroke in displacement to meet the demand of the brake charge system. The high-pressure signal from brake charge solenoid (9G) is also sent to the spring side of priority valve (9F). Priority valve (9F) will continuously meter between the yellow and gray position to ensure that brake charge gets priority.Excess flow not needed by the brake charge system will be sent to the fan system. Inverse shuttle valve (9H) senses the accumulator port (F) or brake accumulator port (G) that has the lowest pressure. Inverse shuttle valve (9H) will continuously be metering between the three positions shown. The metering ensures that the brake accumulator with the lowest pressure gets charged first. In the event of a failure, the accumulator with the highest pressure will be protected.Operation at Brake Cut-Out Pressure
Illustration 3 g03498742
(1) Hydraulic tank
(2) Brake control valve group
(3) Return filter
(3C) Filter bypass
(4) Brake accumulator
(5) Brake accumulator
(6) Pressure sensor one
(7) Pressure sensor two
(8) Block
(9) Control manifold group
(9A) Relief valve
(9B) Check valve
(9C) Screen
(9D) Priority valve
(9E) Solenoid valve group (hydraulic fan)
(9F) Shuttle valve
( 9G) Solenoid valve (Brake charge)
(9H) Shuttle valve
(9J) Inverse shuttle valve
(10) Hydraulic oil cooler
(11) Cooler bypass valve
(12) Temperature sensor
(13) Check valve
(14) Fan motor
(15) Fan and Brake pump
(16) Pump control valve
(16A) Margin adjustment
(16B) High-pressure cutoff adjustments
(A) Load sense port
(B) Load sense test port
(C) Pump discharge port
(D) Pump entry port
(E) Tank return port
(F) Accumulator port
(G) Accumulator port
(H) Pressure sensor port
(J) Pressure sensor port When pressure sensor (6) and sensor (7) sense that the brake system pressure has reached the pre-determined cut-out pressure, a signal will be sent to brake charge solenoid (9G). Brake charge solenoid (9G) will shift to