Guide Rail Lift Troubleshooting: Humming Noise During Upward Movement

A customer recently contacted us about a newly installed hydraulic guide rail lift. The lift was operating normally, but there was a noticeable humming “woo-woo” sound when the platform moved upward.

After analyzing the situation, we suspected the hydraulic cylinders, especially the piston rods and their sealing system.

For a two-cylinder guide rail lift, cylinder alignment and parallelism are very important. If the two cylinders are not working in a sufficiently parallel condition, additional friction can occur.

At the same time, new piston rod seals can be relatively tight during the initial operating period. The piston rod and seals need some time to run in, and this initial friction can sometimes create an unusual sound.

We recommended lubricating the exposed piston rods with suitable oil and adding about 10 liters of suitable hydraulic oil to the hydraulic tank according to the system requirements.

The noise did not disappear immediately. After several days of operation, however, the customer reported that the sound had become much quieter. A few more liters of hydraulic oil were then added.

For a newly installed hydraulic lift, this type of issue should be investigated step by step rather than immediately replacing the cylinder.

Important points to check include cylinder alignment, piston rod condition, seal tightness, lubrication, hydraulic oil level and the running-in period of the new cylinder.

Sometimes, a new hydraulic component simply needs proper lubrication and operating time for the sealing and sliding surfaces to settle into normal working conditions.

This case is a useful reminder that troubleshooting should start with the simplest possible causes before replacing major hydraulic components.