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.

Specifications

References

Refer to Operation and Maintenance Manual, M0074452, "System Pressure Release".

Refer to Operation and Maintenance Manual, M0074452, "Prepare the Machine for Maintenance".

Introduction

This story includes the following test:

• Front Leveling Jack speed test

• Rear Leveling Jack speed test

The Leveling Jack speed test is used to make sure the jacks in the front and rear are moving together evenly.

Front (Non-Drill End) Leveling Jack Test

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, horizontal location 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 within the operator sight.

3. Place the machine in the PARK position.

4. Ensure that there is no load on the FRONT (non-drill end) leveling jacks are under no load.

5. Place the machine engine at high idle.

Test Procedure

1. Using the right thumb roller on the left joystick, lower and raise theFRONT leveling jacks six times while observing speed.

   Note: The thumb roller must be fully stroked to ensure full flow to both jacks.

   Note: Personnel observing jack movement should be positioned so that they have a clear line of sight to both jacks.

2. Lower the engine speed to idle and shut down the Machine.

3. If a noticeable speed difference is observed, adjust the corresponding jack and retest. Refer to Testing and Adjusting, Counterbalance Valve - Test and Adjust in this manual.

Rear (Drill-End) Leveling Jack Test

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, horizontal location 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 within the operator sight.

3. Place the machine in the NEUTRAL position.

4. Ensure that there is no load on the REAR (drill end) leveling jacks are under no load.

5. Place the machine engine at high idle.

Test Procedure

1. Using both thumb rollers on the left joystick , lower and raise the REAR leveling jacks six times while observing speed.

   Note: The thumb rollers must be fully stroked to ensure full flow to both individual jacks.

   Note: Personnel observing jack movement should be positioned so that they have a clear line of sight to both jacks.

2. Lower the engine speed to idle and shut down the Machine.

3. If a noticeable speed difference is observed, adjust the corresponding jack and retest. Refer to Testing and Adjusting, Counterbalance Valve - Test and Adjust in this manual.