Operation - Section 3 OM3017.1 Page 3-8 Operating Instructions DUMPING 1. Pull into dump area with extreme caution. Make sure area is clear of persons and obstructions, including overhead utility lines. Obey signals directed by the spotter, if present. Avoid unstable areas. Stay a safe distance from edge of dump area. Position truck on a solid, level surface before dumping . As body raises, the truck Center of Gravity (CG) will move. Truck must be on level surface to prevent tipping / rolling! 2. Carefully maneuver truck into dump position.
When backing truck into dump position, use only the foot-operated brake pedal to stop and hold truck; DO NOT rely on Wheel Brake Lock to stop truck; this control is unmodulated and applies REAR SERVICE BRAKES ONLY. 3. When truck is stopped and in dump position, apply Wheel Brake Lock and move the Selector Switch to the " N eutral" position. To Raise dump body : The dumping of very large rocks (10% of payload, or greater) or sticky material (loads that do not flow freely from the body) may allow the material to move too fast and cause the body to move RAPIDLY and SUDDENLY.
This sudden movement may jolt the truck violently and cause possible injury to the operator, and/or damage to the hoist cylinders, frame, and/or body hinge pins. If it is necessary to dump this kind of material, refer to the CAUTION in the following procedure: 4. Pull the lever to the rear to actuate hoist circuit. (Releasing the lever anywhere during "hoist up" will place the body in "hold" at that position.) 5. Raise engine RPM to accelerate hoist speed. Refer to the CAUTION below. If dumping very large rocks or sticky material as decribed in WARNING above, slowly accel- erate engine RPM to raise body. When the material starts to move, release hoist lever to "HOLD" position.
If material does not continue moving and clear body, repeat this procedure until material has cleared body. 6. Reduce engine RPM as last stage of hoist cylinder begins to extend and let engine go to low idle as last stage reaches half-extension. ARROW points to Front of Truck. 1. Hoist Control Valve Lever 2. "FLOAT"/"HOLD"Position 3. "DOWN" Position 4. "RAISE" Position 5. Operator’s Seat 7. Release hoist lever as last stage of hoist cylinder reaches full extension. 8. After material being dumped clears body, lower body to frame. To Lower Body : Move hoist lever forward to "down" position and release.
Releasing the lever places hoist control valve in the "float" position allowing the body to return to frame. NOTE: If dumped material builds up at the rear of the body and the body cannot be lowered, shift Selector Switch to "Forward", release Brake Lock, depress Override button and drive forward to clear material. Stop, shift Selector Switch to "Neutral", apply Brake Lock and lower body. The Haulpak truck is not to be moved with the dump body raised except for emergency moves only. Failure to lower body before moving truck may cause damage to hoist cylinders, frame and/or body hinge pins. 9.
With body returned to frame, move Selector Switch to "Forward", release Brake Lock, and leave dump area carefully.