MD6250 Rotary Drill Systems Caterpillar

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Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.

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Failure to follow all safety guidelines prescribed in this document and by governing authorities and regulatory agencies may result in severe injury or death of personnel or machine damage.

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Do not operate any control lever until certain that all personnel are clear of any machine movement, even if the pump motor is not running. Personnel may be seriously injured or killed if struck by a moving machine or machine component.

Introduction

This story includes the following tests:

• Mast Raise Cylinder Speed Test

Note: This test is to be performed on an "As Needed" basis.

Test Preparation

Note: All tests and adjustments must be made while the hydraulic oil is at normal operating temperature.

1. Move the machine to a smooth level surface that is away from operating machines and away from personnel.

2. Permit only one operator on the machine. Keep all other personnel away from the machine or in the operator sight.

3. Place the machine in the PARK position.

4. Stop the engine.

5. Turn the key to the ON position, but do not start the engine.

Test Procedure

1. Ensure the area is free of personnel.

2. Lock the mast in a vertical position.

3. Level the machine on the jacks.

4. Disconnect the mast raise cylinders.

   Note: Secure cylinders so that they will not collide with the A-Frame, Mast, or other structures on the drill.

5. Start the engine and run at high idle.

6. Extend and retract the mast raise cylinders 10 times.

   Note: Be sure to fully stroke the joystick to ensure full flow to the mast raise cylinders.

7. Observe the speed of the cylinders as they are extended and retracted.

   Note: If the test reveals that the cylinders are moving at differing speeds, refer to Testing and Adjusting, "Counterbalance Valve - Test and Adjust" in this manual.

8. Lower the engine speed to idle. Shut down the machine.