H-espacios

Initial propulsion with a loaded truck should begin from a level surface whenever possible. If the truck must be started on a hill or grade, use the following procedure:

1. Fully depress the service brake pedal. Do not use the retarder lever to hold the truck on the grade. With the service brakes fully applied, move the directional control lever to a drive position (FORWARD or REVERSE) and increase the engine rpm with the throttle pedal. 2. As the engine rpm approaches the maximum,

and the operator senses the propulsion effort working against the brakes, release the brakes and let truck movement start. Completely release the service brake pedal. As the truck speed increases above 5-8 kph (3-5 mph), the propulsion system controller (PSC) will drop the propulsion if the retarder is still applied.

NOTE: Releasing and re-applying dynamic retarding during a hill start operation will result in loss of propulsion.

A03039 5/08 General Safety & Operating Instructions A3-25

PASSING

1. Do not pass another truck on a hill or blind curve. Only use areas designated for passing. 2. Before passing, make sure that the road ahead

is clear. If a disabled truck is blocking your lane, slow down and pass with extreme caution.

LOADING

1. Pull into the loading area with caution. Remain at a safe distance while the truck ahead is being loaded.

2. When approaching or leaving a loading area, watch out for other vehicles and personnel working in the area.

3. When pulling in under a loader or shovel, follow the spotter or shovel operator’s signals. The truck operator may speed up loading operations by observing the location and loading cycle of the truck being loaded ahead, then follow a similar pattern.

4. During loading, the operator must stay in the cab with the engine running. Place the directional control lever in NEUTRAL and apply the brake lock.

5. When loaded, pull away from shovel as quickly as possible but with extreme caution.

DUMPING

Raising The Dump Body

1. Pull into the dump area with extreme caution. Make sure the area is clear of persons and obstructions, including overhead utility lines. Obey signals directed by the spotter, if present. 2. Avoid unstable areas. Stay a safe distance from

the edge of the dump area.

To prevent tipping or rolling, position the truck on a solid, level surface before dumping. As the body raises, the truck center of gravity will move.

3. Carefully maneuver the truck into the dump position. When backing the truck into the dump position, use only the foot-operated brake pedal to stop and hold the truck. Do not rely on the wheel brake lock to stop the truck. This control is not modulated and applies the rear service

brakes only.

4. When the truck is stopped and in the dump position, apply the brake lock and move the directional control lever to NEUTRAL.

Dumping 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.

5. Pull the lever to the rear to actuate the hoist circuit. Releasing the lever anywhere during “hoist up” will hold the body at that position. 6. Raise the engine rpm to accelerate the hoist

speed.

If dumping very large rocks or sticky material as described in the WARNING above, slowly accelerate the engine to raise the body. When the material starts to move, release the hoist lever to the HOLD position. If the material does not continue moving and clear the body, repeat this procedure until the material has cleared the body.

7. 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.

8. Release the hoist lever as the last stage of the hoist cylinder reaches full extension.

9. After the material being dumped clears the body, lower the body to the frame.

Lowering The Dump Body (When dumping on flat ground):

It is very likely when dumping on flat ground that the dumped material will build up enough to prevent the body from lowering. In this case, the truck will have to be driven forward a short distance (just enough to clear the material) before the body can be lowered.

1. Move the directional control lever to FORWARD, release the brake lock, depress the override button, and drive just far enough forward for the body to clear the material. 2. Stop, move the directional control lever to

NEUTRAL, and apply the brake lock.

3. Move the hoist lever forward to the DOWN position. Release the lever to place the hoist control valve in the FLOAT position, which allows the body to return to the frame.

If dumped material builds up at the rear of the body and the body cannot be lowered, then perform the following steps:

a. Move the hoist lever back to the RAISE position to fully raise the dump body. Then release the hoist lever so it returns to the HOLD position.

b. Move the directional control lever to FORWARD, release the brake lock, depress the override button, and drive forward to clear the material.

c. Stop, move the directional control lever to NEUTRAL, apply the brake lock, and lower the body.

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.

Do not move the truck with the dump body raised except in an emergency. Failure to lower body before moving truck may cause damage to hoist cylinders, frame and/or body hinge pins.

Lowering The Dump Body

(When dumping over a berm or into a crusher):

1. Move the hoist lever forward to the DOWN position. Release the lever to place the hoist control valve in the FLOAT position, which allows the body to return to the frame.

If dumped material builds up at the rear of the body and the body cannot be lowered, perform the following steps:

a. Move hoist lever back to the HOIST position to fully raise the dump body. 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. Move the directional control lever to FORWARD, release the brake lock, depress the Override button, and drive forward to clear the material.

c. Stop, move the directional control lever to NEUTRAL, apply the brake lock and lower the body.

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.

Do not move the truck with the 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.

2. With the body returned to the frame, move the directional control lever to FORWARD, release the brake lock, and leave the dump area carefully.

A03039 5/08 General Safety & Operating Instructions A3-27

TOWING

Before towing a truck, many factors must be carefully considered. Serious personal injury and/or significant property damage may result if important safety practices, procedures and preparation for moving heavy equipment are not observed. Do not tow the

truck any faster than 8 kph (5 mph).

Information about the towing attachments listed below is available from your Komatsu service representative:

Front Bumper Modification Kit - MK3941: This kit

contains the parts necessary to modify the front bumper for installation of towing bosses. One MK3941 kit is required for each truck in the fleet.

Tow Adaptor Structure - MK3945: This structure

must be ordered (or designed) to mate with the intended towing vehicle and is intended for towing an

unloaded vehicle only.

A disabled machine may be towed after the following precautions have been taken.

1. Turn off the engine.

2. If the truck is equipped, install hydraulic connections for steering and dumping between towing and towed vehicles. Check the towed vehicle braking system.

3. If the truck is loaded, dump the entire load. Never pull or tow a loaded truck. Refer to Disabled Truck Dumping Procedure.

4. Make sure that the tow bar has adequate strength (approximately 1.5 times the gross vehicle weight of truck being towed).

5. Make sure that the towing vehicle has adequate capacity to both move and stop the towed truck under all conditions.

6. Chock the disabled truck’s wheels to prevent movement while attaching the tow bar.

7. Release the disabled truck’s brakes and remove the blocking.

Sudden movement may cause tow bar failure. Smooth, gradual truck movement is preferred.

8. Minimize the tow angle at all times. Never

exceed 30 degrees. The towed truck must be

steered in the direction of the tow bar.