PLATE & FILM GP 1400126 - Caterpillar

Illustration 1 g03419845
Front Propel Motor
(1) Propel motor
(2) Shift line
(3) Speed sensor
(4) Brake line
(5) Brake assembly The machine is equipped with two propel motors, one for each drum. Rear propel motor (1) is located on the left side of the rear drum. The front propel motor (not shown) is located on the right side of the front drum. Each motor is a radial-piston motor with two speeds.On rear propel motor (1), port "B" is the forward supply port, and port "A" is the reverse supply port.Note: On the front propel motor, the forward supply port is labeled "A". The reverse supply port is labeled "B".Brake assembly (5) is mounted on each propel motor. When the interlock valve in the propel pump is energized, charge oil is directed from the pump into brake line (4). In this case, the parking brakes are released.Shift line (2) receives supply oil from the shift valve. When the shift valve is energized, charge oil is directed to the shift line and the motor shifts to high-speed mode.Note: With propel mode set to high, the front propel motor operates in high speed mode and the rear propel motor operates in low speed mode. This combination of operating modes provides better gradability and braking performance than by operating both drum motors in the high speed mode.Each motor is equipped with speed sensor (3). A gear on the output shaft of the motor rotates past the tip of the speed sensor. Each time a tooth passes the sensor, an electrical impulse is generated. The machine ECM number-one converts the frequency of the impulses to a machine speed.
Illustration 2 g03419846
Cross Section, Propel Motor Cylinder Block
(6) Output shaft
(7) Cam ring
(8) Cylinder block
(9) Cam follower
(10) Piston
(11) Distribution channel 3
(12) Distribution channel 2
(13) Distribution channel 1 Cam ring (7) and control valve (not shown) in the radial-piston motor are stationary. Cylinder block (8) and pistons (10) rotate with output shaft (6). During motor operation, each piston in the motor goes through a four-phase cycle. The phases in the cycle correspond with the position of the cam follower in relation to the lobes of the cam ring.When cam follower (9) is at the highest point on the cam lobe (relative to the center of the motor), piston (10) is in the top-neutral phase.