Operation - Section 30 OM3043 06/06 Page 30-8 Operating Instructions DUMPING 1. Approach the dump area with extreme caution. Ensure the area is clear of persons and obstructions, including overhead utility lines. Obey signals directed by the spotter, if present. If dumping very large rocks or sticky material, as described in the warning, slowly accelerate the engine rpm to raise the body. When the material starts to move, release the hoist lever to the HOLD position. If the material does not continue to exit the body, repeat this procedure as necessary. Avoid unstable areas. Stay a safe distance from the edge of the dump area. Position the truck on a solid, level surface before dumping. 6.
Reduce the engine rpm as the last stage of the hoist cylinder begins to extend. Let the engine go to low idle as the last stage reaches half- extension . As the body raises, the truck center of gravity will move. The truck must be on a level surface to prevent tipping/rolling! 2. Carefully maneuver the truck into the dump posi- tion. When backing the truck into the dump posi- tion, use only the brake pedal to stop and hold the truck. DO NOT rely on the wheel brake lock to stop the truck. This control is unmodulated and applies the rear service brakes only. 3. When the truck is stopped and in the dump position, apply the wheel brake lock. Move the selector switch to the NEUTRAL position.
To Raise The Dump Body: 7. Release the hoist lever as the last stage of the hoist cylinder reaches full extension. Dumping certain types of material can result in sudden and violent movement of the truck. This truck movement may cause injury to the opera- tor. It may also cause damage to the hoist cylin- ders, frame, and/or body hinge pins. Use caution when dumping large rocks (10% of payload, or greater) to prevent the load from shifting too quickly. Sticky material (loads that do not flow freely from the body) may also cause sudden truck movement if the load releases quickly. To Lower The Dump Body: (When dumping over a berm or into a crusher): 8.
Move the hoist lever forward to the DOWN posi- tion and release. Releasing the lever places the hoist control valve in the FLOAT position, allow- ing the body to return to the frame. 4. Move the lever to the HOIST position. Refer to Fig. 30-1. Releasing the lever while in the HOIST position will cause the lever to move to the HOLD position. DO NOT drive forward in the fully raised position if the dump body will not clear an obstacle, such as a crusher wall. DO NOT move t he truck with a raised dump body raised except in an emergency. Failure to lower the body before moving the truck may cause damage to the hoist cylinders, frame, and/ or body hinge pins. 5.
Raise the engine rpm to accelerate the hoist speed. NOTE: If the dumped material builds up at the rear of the truck and the body cannot be lowered, perform the following steps: FIGURE 30-1. HOIST LEVER POSITIONS