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O-RING 0878435 - Caterpillar

0878435 O-RING Caterpillar parts O
Alternative (cross code) number:
Caterpillar 0878435 O-RING

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Illustration 1 g03715592
Machine General InformationThe propel control system contains an electrical portion, a hydraulic portion, and a mechanical portion. The electrical portion is made up of electronic control modules (ECMs) and input and output devices. The hydraulic portion consists of two closed-circuit hydrostatic drive loops. The mechanical portion is comprised of two, two-speed, planetary final drives, each of which drives a rear wheel.In each hydrostatic drive loop, the ECMs on the machine control a variable-displacement propel pump. This pump drives a fixed-displacement propel motor. Each motor drives a two-speed, planetary final drive. The final drives transfer power from the propel motors to the wheels. The planetary final drives have spring-applied, hydraulically released parking brakes. The auxiliary hydraulic pump supplies oil pressure which releases the brakes. Oil from the auxiliary pump also shifts the two-speed final drives. The ECMs on the machine control the engagement of the parking brake and the shifting of the machine.The electronic control system monitors the machine and monitors engine operating conditions. The ECMs on the machine, the screed, and the engine communicate through controller area network (CAN) lines. The control system determines if an output signal should be sent to the pump solenoids. During normal operation, the propel system is controlled through closed-loop logic. The system prevents the machine from moving under the following conditions:
The propel lever is out of the NEUTRAL position when the machine is started.
The parking brake status is set to engaged.
The propel lever is in the NEUTRAL position.
The propel speed dial status is set to "0", and the propel mode status is set to PAVE, TRAVEL, or MANEUVER.
The decelerator pedal (optional) is fully depressed.
A fault is detected in a circuit to any of the following components: propel solenoid, steering sensor, or parking brake solenoid.
The machine is in a runaway condition or in a rollback condition.The electronic control system is also programmed with underspeed control logic and wide width paving logic. The underspeed control logic automatically adjusts the machine speed during low engine speed conditions in order to prevent the engine from stalling. Wide width paving logic limits the maximum machine speed to 10 kph (6.2 mph) to limit dynamic loads and stresses on the tractor and screed. Any combination of extensions over 250 mm (9.8 inch) on one side of the screed invokes wide width paving logic.The machine can be equipped with an optional front-wheel assist system. This feature can power the front wheels only while the machine is operating in the pave mode. The front-wheel assist system provides added traction when the machine is pushing trucks or working on soft base.The front-wheel assist system can be either four-wheel drive or all-wheel drive. In the four-wheel drive system, two of the front wheels are equipped with hydraulic motors. In the all-wheel drive system, each front wheel is equipped with a hydraulic motor.

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