D250E Series II and D300E Series II Articulated Trucks Caterpillar

Note: You need two people to perform this procedure.

Note: The batteries for the machine must be fully charged in order to perform this procedure.

1. Apply the parking brake. Install the steering frame locks. Block the wheels.

   Refer to Operation and Maintenance Manual, "Steering Frame Lock".

Show/hide table



Illustration 1	g00615844

2. The hoist control valve is located above the transfer gear case.

Show/hide table



Illustration 2	g00637022

3. Loosen O-ring face seal nut (1) on lowering control valve (2). Insert a 3/8 hex wrench into valve (3). Turn the valve counterclockwise by two turns.

4. Turn the engine start switch to the ON position.

Show/hide table



Illustration 3	g00629568

5. Push the top half of the switch for the secondary steering. The switch must be held in the ON position.

6. Move the lever for the hoist control to the FLOAT position.

Show/hide table



Illustration 4	g00615846

7. Pull up knob (4) on lowering control valve (5). The knob must be held in this position. This will allow the oil to flow from the secondary steering pump to the hoist cylinders. The dump body will lower under power.

8. When the dump body has been fully lowered, release knob (4) on lowering control valve (5). Release the switch for the secondary steering.

9. Turn valve (3) in a clockwise direction until the valve is closed. Tighten O-ring face seal nut (1) to a torque of 50 ± 7 N·m (37 ± 5 lb ft).

Do not operate the machine until the fault has been corrected.