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| Illustration 1 | g01014007 |
(1) Magnet assembly (2) Body down or up switch | |
Body down or up switch (2) is located on a bracket on the rear frame. Magnet assembly (1) is connected to the dump body. When the dump body is raised, body down or up switch (2) sends a signal to the Power Train Electronic Control Module (Power Train ECM). 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 body down or up switch (2) and a signal will be sent to the Power Train ECM. This signal indicates that the dump body is DOWN. This particular type of body down or up switch does not require an adjustment procedure.
Body down or up switch (2) is used to limit the top gear while the dump body is up. The Power Train ECM 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 Control Analyzer Programmer (ECAP) or the Electronic Technician (ET). The top gear value can be changed to SECOND gear or THIRD gear.
The signal from body down or up switch (2) is also used to control the SNUB position of the hoist control valve. The Power Train ECM will signal the hoist proportioning solenids to move the hoist control valve to the SNUB position when the dump body that is being lowered nears the frame. When the hoist control valve is moved to the SNUB position the speed of the dump body is reduced in order to prevent the dump body from contacting the frame with too much force.
The signal from body down or up switch (2) is used to provide warnings to the operator when the truck is moving with the dump body UP.