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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. |
This story includes the following test:
- Mast Raise Counterbalance Valve Adjust
Note: All tests and adjustments must be made while the hydraulic oil is at normal operating temperature.
Note: Make sure all counterbalance valves are clean and clear from dust or debris before making any adjustments.
- Move the machine to a smooth, horizontal location away from operating machines and away from personnel.
- Permit only one operator on the machine. Keep all other personnel away from the machine or in the operator sight.
- Place the machine in the NEUTRAL position.
- Clock / mark the valves original setting by carefully placing a paint mark at the 12 o'clock position of the spool.
- Place a corresponding mark on the valve body or a fixed component near the spool to document the original position.
- Using an allen key and wrench, carefully unlock the spool without disturbing the spool's original position.
- Turn the adjustment on the counterbalance valve 1/4 turn in the direction necessary for adjustment.
Note: The counterbalance valve adjustments are opposite of a typical relief valve.
Note: Always keep count of the number of turns used to adjust the valve.
Note: If the spool bottoms out in the valve body, the counterbalance valve is defective and must be replaced.
- Test the mast raise cylinder speed. If no difference is observed in the speed of the jacks, continue on. If a difference in jack speed is still observed, repeat the above step and recheck.
- Carefully lock the spool in place.
- Reconnect the cylinders to the mast.
- Raise and lower the mast raise cylinders three times to verify that the cylinders are moving normally with no shuttering or erratic movement.
- If a noticeable difference is still observed, disconnect the mast raise cylinders and repeat the above steps.