I am encountering an issue with the boom swing on my JLG 40H diesel lift. The swing is only moving about 2 feet in either direction despite checking the control valve, which is in working condition. A dealer suggested it could be the swing drive motor, so we replaced it, but the problem persists. The swing feature is not functioning from the basket or on the ground. I am seeking ideas and solutions. Thank you for your time.
While I am no professional, could it be that there is a gearbox located beneath the swing motor? This could potentially be causing the issue at hand. Additionally, I would assume that there is a swing brake similar to what is found in excavators, integrated into the swing motor. However, it is necessary for there to be sufficient hydraulic pressure in order to disengage the brake.
Expert Opinion: Could there be a gearbox located under the swing motor causing the issue? It's possible that the problem lies there. Additionally, it's important to consider if there is a swing brake, similar to those in excavators, integrated into the swing motor. However, hydraulic pressure is required to release it. I appreciate the advice and will test the pressure this weekend as I only have Sunday to dedicate to fixing this machine. It is a new purchase, so thank you once again for your help.
Rumrunner expressed gratitude for the provided information and mentioned plans to check the pressure over the upcoming weekend. With only Sunday available to work on the newly purchased machine, time is limited. It's crucial to inspect the swing gear box thoroughly as a previous experience revealed issues due to lack of gear oil, causing parts to seize. Consider removing the swing motor to verify proper functionality in both directions and ensure the swing brake releases as intended.
Thank you for providing us with the valuable information. We appreciate your input.
To troubleshoot, remove the motor from the brake and then detach the brake from the torque hub. Try manually moving the boom - if it moves smoothly, the issue is not with the planetaries. With the components separated, have someone engage the swing function to check if the motor is spinning properly. If it is, the likely culprit is the brake. This simple diagnostic process can help identify and address any potential issues efficiently.
Answer: - The issue could be related to a malfunctioning swing drive motor, despite replacing it not resolving the problem.
Answer: - So far, the control valve has been checked and confirmed to be in working condition. Additionally, the swing drive motor has been replaced without resolving the problem.
Answer: - The issue seems to be affecting the functionality of the boom swing from both operating positions, indicating a more complex problem with the lift system.
Answer: - While the swing drive motor was replaced in an attempt to fix the issue, there may be other components or factors contributing to the malfunctioning boom swing. Additional troubleshooting may be required to identify the root cause.
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