WRENCH A- 8T7644 - Caterpillar

Brake manifold (21) also routes the oil to pressure taps (B) and (C). To check the pressure for the front service brakes, use pressure tap (D) on brake manifold (21). To check the pressure for the rear service brakes, use pressure tap (E) on brake manifold (21) .Pressure switch (11) is for the accumulator for the front service brakes. Pressure switch (12) is for the accumulator for the rear service brakes. Both pressure switches are located on brake manifold (21).
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(16) Oil pressure sensor for the front service brakes. (17) Oil pressure sensor for the rear service brakes. (18) Check valve for the brake manifold. (21) Brake manifold.If the machine is equipped with the Vital Information Management System (VIMS), two oil pressure sensors will be located on brake manifold (21). Oil pressure sensor (16) is for the front service brakes. Oil pressure sensor (17) is for the rear service brakes.
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(5) Parking brake pressure switch. (8) Parking brake control valve.Check valve (18) is in the drain line from the parking brake line. The oil also flows into parking brake control valve (8). Accumulator (10) also provides pressure oil for parking brake control valve (8). Pressure oil also flows to parking brake pressure switch (5) .When parking brake control valve (8) moves to the disengaged position, oil from the accumulator flows through parking brake control valve (8). The oil then flows to the parking brake. This causes parking brake (3) to disengage.
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Location of the Parking Brake (3) Parking brake.Parking brake (3) engages automatically when the supply pressure from the accumulators drops below 6035 515 kPa (875 75 psi). This causes parking brake pressure switch (5) to open.When the oil pressure increases to approximately 8270 kPa (1200 psi), parking brake pressure switch (5) closes. This stops the Warning Category 3 alarm if the transmission was in a forward speed position or in a reverse speed position. However, if the transmission was in neutral, the Warning Category 1 would stop.Parking brake limit switch (4) functions as an override switch for the transmission.Axle Oil Cooler
854G Wheel Dozer (S/N: AMP1-337) and 992G Wheel Loader (S/N: ADZ1-540)
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Hydraulic Schematic for the Axle Oil Cooler (29) Rear axle housing. (30) Rear brake manifold. (31) Axle oil cooler for the rear axle. (32) Axle oil cooler for the front axle. (33) Front brake manifold. (34) Front axle housing. (35) Axle oil cooler pump for the front axle. (36) Axle oil cooler pump for the rear axle.Axle oil cooler pumps (35) and (36) circulate the oil which flows through both axle housings. Axle oil cooler pump (35) circulates the oil through axle oil cooler (32) and front brake manifold (33) and through front axle housing (34) . Axle oil cooler pump (36) circulates the oil through axle oil cooler (31) and rear brake manifold (30) and through rear axle housing (29) . 854G Wheel Dozer (S/N: AMP338-UP; A4W1-UP) and 992G Wheel Loader (S/N: ADZ541-UP; AZX1-UP)
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Hydraulic Schematic for the Axle Oil Cooler (37) Screen