Pneumatic Lubricator Under-Oiling in Roll Forming Machines – Causes, Component Wear, Inspection & Repair Guide

Pneumatic Lubricator Under-Oiling

Roll Forming Machine Hydraulic & Pneumatic Failure Guide

Pneumatic lubricator under-oiling is a pneumatic system issue in roll forming machines where the air line lubricator fails to supply sufficient oil mist into the compressed air stream, leading to inadequate lubrication of pneumatic components.

Many roll forming machines use an FRL unit (Filter–Regulator–Lubricator) to prepare compressed air before it enters the pneumatic system.

The lubricator portion of the FRL unit introduces a fine mist of lubricating oil into the compressed air.

This oil mist lubricates internal moving components within pneumatic devices such as:

pneumatic cylinders
air solenoid valves
directional control valves
pneumatic actuators
air motors
mechanical linkages driven by pneumatic systems

When properly adjusted, the lubricator delivers a controlled and consistent amount of oil into the airflow.

However, if the lubricator does not supply enough oil, pneumatic components may operate with insufficient lubrication.

This condition is known as lubricator under-oiling.

Lubricator under-oiling may affect roll forming machines producing:

metal roofing panels
metal wall cladding panels
standing seam roofing systems
structural deck profiles
C and Z purlins
light gauge steel framing components

Typical production symptoms associated with lubricator under-oiling include:

dry pneumatic cylinder movement
increased friction in pneumatic actuators
valves becoming noisy during operation
premature seal wear
slower pneumatic response
increased maintenance frequency

If pneumatic components operate without proper lubrication for extended periods, internal wear may increase significantly.

Maintaining correct lubricator settings helps ensure reliable pneumatic system performance.

Causes of Wear or Failure

Lubricator under-oiling usually occurs when the lubricator cannot deliver sufficient oil into the compressed air stream.

Several factors may contribute to this condition.

Incorrect Lubricator Adjustment

The oil feed rate may be set too low.

Empty Lubricator Reservoir

Insufficient oil in the reservoir prevents oil delivery.

Clogged Lubricator Passages

Contamination may block oil flow.

Low Airflow Through the Lubricator

Insufficient airflow may prevent proper oil atomization.

Incorrect Oil Type

Oil viscosity may prevent proper atomization.

Internal Lubricator Wear

Worn components may reduce oil injection efficiency.

Why It Happened and What Caused It

From a pneumatic engineering perspective, air line lubricators use a pressure differential created by airflow through a venturi mechanism.

As compressed air passes through the lubricator, a small pressure drop draws oil from the reservoir into the airflow.

The oil is then atomized into fine droplets and carried through the pneumatic system.

However, if airflow through the lubricator is insufficient, the pressure differential may not be strong enough to draw oil into the air stream.

Additionally, if the lubricator adjustment valve is set too low, only a minimal amount of oil may be injected.

Clogged passages or improper oil viscosity may further restrict oil flow.

Without sufficient lubrication, pneumatic components may experience increased friction and wear.

Proper lubricator adjustment and regular maintenance help ensure adequate lubrication.

How to Inspect the Problem

Inspection Procedure

Diagnosing lubricator under-oiling requires inspecting the FRL unit and pneumatic system components.

Step 1 – Inspect the Lubricator Oil Level

Check whether the reservoir contains sufficient oil.

Step 2 – Inspect Lubricator Adjustment

Verify that the feed rate is set correctly.

Step 3 – Inspect Pneumatic Components

Dry or noisy operation may indicate insufficient lubrication.

Step 4 – Inspect Airflow Through the Lubricator

Ensure adequate airflow passes through the unit.

Step 5 – Inspect Lubricator Internal Passages

Check for blockages or contamination.

Step-by-Step Technician Guide – How to Fix

Correcting lubricator under-oiling usually requires restoring proper oil delivery to the pneumatic system.

Method 1 – Refill the Lubricator Reservoir

Add the correct pneumatic oil.

Method 2 – Adjust the Lubricator Feed Rate

Increase oil injection to the recommended level.

Method 3 – Clean Lubricator Passages

Remove debris blocking oil flow.

Method 4 – Replace the Lubricator Unit

Install a new lubricator if internal components are worn.

Method 5 – Use Correct Pneumatic Oil

Ensure the oil viscosity matches manufacturer specifications.

Preventative Maintenance Tips

Preventing lubricator under-oiling requires maintaining proper lubricator operation and monitoring oil levels.

Maintain Proper Oil Level

Ensure the lubricator reservoir is always filled.

Inspect Lubricator Adjustment

Verify correct feed rate settings.

Maintain Clean Air Supply

Clean air prevents lubricator blockage.

Inspect Pneumatic Components Regularly

Early detection prevents excessive wear.

Follow Lubrication Guidelines

Use the correct oil type and quantity.

FAQ Section

What causes lubricator under-oiling in roll forming machines?

Incorrect adjustment, empty reservoirs, clogged passages, or low airflow may reduce oil delivery.

Can under-oiling damage pneumatic components?

Yes. Lack of lubrication may increase friction and wear.

How can lubricator under-oiling be detected?

Dry or noisy pneumatic components may indicate insufficient lubrication.

Should lubricator oil levels be checked regularly?

Yes. Regular checks ensure proper lubrication.

Can incorrect oil type affect lubricator performance?

Yes. Oil viscosity affects atomization in the lubricator.

How can lubricator under-oiling be prevented?

Maintaining oil levels, proper adjustment, and clean air supply helps prevent this issue.