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| Illustration 1 | g00518953 |
(1) Magnet assembly (2) Body up or down sensor | |
The body up or down sensor (2) is located on a bracket on the rear frame. The magnet assembly (1) is connected to the dump body. When the dump body is raised, the body up or down sensor (2) sends a signal to the Electronic Programmable Transmission Control (EPTC II). The signal indicates that the dump body is in the UP position. When the dump body is lowered, the magnet assembly (1) will pass in front of the body up or down sensor (2) and a signal will be sent to the Electronic Programmable Transmission Control (EPTC II). This signal indicates that the dump body is DOWN. The adjustment of the body up or down sensor (2) is very important. Refer to the Hydraulic System Testing and Adjusting, "Electronic Control (Body Down or Up Sensor) - Adjust" for the proper adjustment procedure.
Body up or down sensor (2) will limit the top gear that is being used while the dump body is in the UP position. The Electronic Programmable Transmission Control (EPTC II) comes from the factory with the top gear value that is set to FIRST gear. The transmission will not shift past FIRST gear until the dump body is down. The top gear value is programmable by utilizing the Electronic Technician (ET). The top gear value can be changed to SECOND gear, THIRD gear, or FOURTH gear.
The signal from body up or down sensor (2) is also used to control the SNUB position of the hoist control valve. The Electronic Programmable Transmission Control (EPTC II) will signal the hoist proportioning solenoids to move the hoist control valve to the SNUB position when the dump body that is being lowered nears the frame. The speed in FLOAT is reduced in the SNUB position in order to prevent the dump body from contacting the frame too hard.
The signal from the body up or down sensor (2) is used to provide warnings to the operator when the truck is moving with the dump body in the UP position.