OM3037 Operation - Section 3 Operating Instructions Page 3-7 DUMPING 5. Raise engine RPM to accelerate hoist speed. Refer to the CAUTION below. 1. Pull into dump area with extreme caution. Make sure area is clear of persons and obstructions, including overhead utility lines. Carefully maneu- ver truck into dump position. Obey signals directed by the spotter, if present. 2. Avoid unstable areas. Stay a safe distance from edge of dump area. Position truck on a solid, level surface before dumping. If dumping very large rocks, or sticky materials, as described in the previous WARNING, slowly accel- erate engine RPM to raise body.
When the material starts to move, release hoist lever to “HOLD” posi- tion. 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 cylin- der begins to extend and let engine go to low idle as last stage reaches half-extension. As body raises, the truck Center of Gravity (CG) will move. Truck must be on level surface to pre- vent tipping / rolling! 7. Release hoist lever as last stage of hoist cylinder reaches full extension. 3. When in dump position, apply Brake Lock and move Selector Switch to the “Neutral” position. To Lower Body: When dumping over a berm or into a crusher: To Raise dump body:
8. 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, perform steps “a” & “b” below: 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 RAP- IDLY 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: a. Move hoist lever back to the “hoist” position to fully raise the dump body. Then release the hoist lever so it returns to the “hold” position. NOTE: DO NOT drive forward if the tail of body will not clear the crusher wall in the fully raised position. b. Shift Selector Switch to “Forward”, release Brake Lock, depress Override button and drive forward to clear the material. Stop, shift Selector Switch to “Neutral”, apply Brake Lock and lower body again. 4. Pull the lever to the rear to actu- ate hoist circuit.
(Releasing the lever anywhere during “hoist up” will place the body in “hold” at that position.) NOTE: Failure to “hoist” the body after making an unsuccessful attempt at lowering the body may result in the dump body suddenly lowering after the truck has pulled ahead of the material that was previously preventing the body from lowering. CAUTION! The 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 cylin- ders, frame and/or body hinge pins.