A four position hoist control determines the operation of the dump body. The hoist control is located to the left of the operators seat. The hoist control contains spring returns. The lever will move from the RAISE position to the HOLD position when the operator releases the lever. And, the lever will move from the LOWER position to the FLOAT position when the operator releases the lever. The four positions of the hoist control are: RAISE, HOLD, FLOAT, and LOWER.
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The body must be lowered and in the FLOAT position when operating the machine. This will help prevent damage to the body, caused by vibrations from the haul road. |
The hoist control is connected to the hoist control position sensor which is a Pulse Width Modulated (PWM) sensor. The PWM sensor sends duty cycle input signals to the "Chassis Electronic Control" Module ("Chassis" ECM). Depending on the position of the sensor and the corresponding duty cycle, one of the two solenoids on the hoist control valve is energized. The sensor provides a duty cycle signal that changes for all positions of the hoist lever. The duty cycle signal allows the operator to modulate the speed of the hoist cylinders.
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| Illustration 1 | g03710159 |
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View of the hoist control | |
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| Illustration 2 | g03710164 |
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View of area (A) showing the lever and the position symbols | |
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LOWER Position - Hold the hoist control lever forward to lower the dump body. When the lever is released, the lever will return to the FLOAT position. |
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FLOAT Position - When the hoist control lever is in the FLOAT position, the dump body will seek a level. The hoist control will stay in this position until the lever is manually moved. |
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HOLD Position - When the hoist control is in the HOLD position, the dump body will not move. The hoist control will stay in this position until the lever is manually moved. |
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RAISE Position - Hold the hoist control lever backward to raise the dump body and empty the load. When the lever is released, the lever will return to the HOLD position . |