Product Overview

The Ingersoll Rand 39911631 Oil Filter Element is a replacement filtration component used in the lubrication circuit of industrial rotary screw air compressors. Its primary function is to remove solid contaminants, wear particles, and accumulated debris from compressor oil before the oil returns to the airend and other lubrication-dependent components.

In an oil-injected rotary screw compressor, lubricating oil performs several jobs simultaneously. It reduces friction between moving components, helps seal the rotor clearances, and carries away heat generated during compression. As the compressor operates, the circulating oil gradually collects contaminants originating from normal component wear, oxidation, and environmental exposure. Without effective filtration, these particles can circulate through the lubrication system and contribute to accelerated wear.

The 39911631 is associated with Ingersoll Rand EP75 and EP100 rotary screw compressor installations. It is also listed for selected HP, XP, HXP, and EPE compressor configurations. These machines use circulating lubricant to support the compression process, making oil filtration an essential part of their routine maintenance.

The filter operates within the compressor’s oil circuit rather than the incoming air filtration assembly. Oil passes through the filter media, where suspended contaminants are retained before the filtered lubricant continues through the designated lubrication passages. This helps limit the accumulation of abrasive particles around the airend, oil cooler, and associated oil-carrying components.

For maintenance personnel, the 39911631 is particularly relevant during scheduled oil system servicing. Replacing the oil filter at the appropriate interval helps maintain oil cleanliness and reduces the risk of accumulated contaminants affecting lubrication performance.

The part number also has historical replacement references associated with earlier compressor parts listings, including 39796982. However, Ingersoll Rand compressor models from the same general period may have used different filter configurations. The compressor model, serial number, and original parts configuration should therefore be checked before selecting a replacement.

Technical Specifications

Product Features

• Compressor Oil Filtration: Removes suspended particles and debris from circulating compressor lubricant.
• Airend Protection: Helps limit the circulation of abrasive contaminants through the compression and lubrication system.
• Lubrication Circuit Application: Operates within the compressor oil circuit rather than the intake air filtration assembly.
• Industrial Compressor Compatibility: Associated with selected EP75, EP100, HP, XP, HXP, and EPE compressor configurations.
• Routine Maintenance Replacement: Suitable for scheduled oil system servicing and filter replacement.
• Oil Cleanliness Management: Helps maintain cleaner lubricant as it circulates through the compressor.
• Related Part Identification: Associated with historical replacement reference 39796982 in certain compressor parts listings.

Working Principle

The 39911631 works through mechanical filtration within the compressor’s circulating oil system. During operation, the oil pump moves lubricant through the designated oil passages, directing it through the filter before it reaches the components requiring lubrication.

The filtration process follows this general sequence:

Oil Sump / Oil Reservoir → Oil Pump → 39911631 Oil Filter Element → Oil Cooler / Lubrication Circuit → Airend

As oil passes through the filter media, suspended solid particles are retained within the filtration structure. The filtered oil then continues through the lubrication circuit, where it supports rotor operation, cooling, and sealing inside the compressor.

Consider an EP75 or EP100 rotary screw compressor operating continuously in a manufacturing facility. During compression, the lubricant is exposed to heat and mechanical activity. Small wear particles and other contaminants can gradually enter the circulating oil. The 39911631 captures these particles as the oil passes through the filtration stage.

Over time, accumulated contamination increases the resistance to oil flow. If the filter becomes excessively loaded, the pressure differential across the element can increase, potentially affecting the oil supply to downstream components.

This is why oil filter replacement should be included in routine compressor maintenance rather than being delayed until an obvious operating problem develops. The condition of the oil, operating hours, and applicable maintenance schedule should all be considered when determining replacement timing.

The filter also works as part of a wider lubrication maintenance arrangement. Replacing the oil filter without considering oil condition, cooler cleanliness, and other filtration components may leave existing contamination within the system.

Role in the Compressor Lubrication System

The 39911631 occupies a filtration position in the compressor’s oil circulation circuit. Its purpose is to reduce the amount of solid contamination carried by the lubricant before the oil reaches critical machine components.

A typical oil-injected rotary screw compressor lubrication arrangement includes the following elements:

Oil Reservoir → Oil Pump → Oil Filter → Oil Cooler → Airend → Oil Separation and Return Circuit

The oil filter and air/oil separator perform different functions. The 39911631 filters contaminants from the circulating lubricant, whereas the air/oil separator removes oil droplets from compressed air after the compression process.

Maintaining both filtration stages is important in oil-injected compressor installations. Contamination in the lubrication circuit can affect the airend, while deterioration of the separation stage can increase oil carryover into the compressed-air system.

For EP75 and EP100 installations, the correct filter configuration should be established from the compressor’s original parts arrangement. Similar-looking replacement elements should not automatically be considered interchangeable.

Industrial Applications

Installation and Maintenance

1. Verify the Part Number: Confirm that 39911631 matches the compressor’s original oil filter specification. Check the compressor model and serial number, particularly when servicing older EP, HP, XP, HXP, or EPE equipment.
2. Prepare the Compressor: Stop the compressor, isolate the power supply, and allow the machine to cool sufficiently before opening the lubrication circuit.
3. Relieve System Pressure: Ensure that the compressor has been fully depressurized according to its maintenance procedure. Residual pressure in the oil circuit can cause hot lubricant to escape during servicing.
4. Drain the Lubricant if Required: Follow the applicable compressor maintenance procedure to drain or isolate the oil circuit before removing the existing filter.
5. Remove the Existing Filter: Carefully remove the used filter element and collect any residual oil. Avoid allowing accumulated contamination to enter exposed oil passages.
6. Inspect the Filter Housing: Examine the mounting area, oil passages, and sealing surfaces for dirt, deposits, damaged threads, or signs of oil leakage.
7. Check the Replacement Element: Inspect the new 39911631 for physical damage and verify that its dimensions and connection arrangement correspond to the original component.
8. Inspect the Sealing Components: Check the applicable sealing surfaces and replace damaged or deteriorated seals according to the compressor maintenance instructions.
9. Install the Replacement Filter: Position the new element correctly and tighten it according to the specified installation procedure. Avoid excessive tightening that could damage the filter or its sealing surfaces.
10. Restore the Oil Circuit: Refill or restore the lubricant supply as required. Check the oil level and confirm that the correct compressor lubricant is being used.
11. Perform a Leakage Inspection: Restart the compressor following the prescribed commissioning procedure. Inspect the filter connection and surrounding oil passages for leakage and verify normal oil system pressure.
12. Record the Maintenance Work: Document the replacement part number, date, operating hours, lubricant condition, and any unusual contamination observed during filter removal.

Compatible System Components

Recommended Related Models

Key Advantages

• Removes suspended contaminants from circulating compressor oil.
• Helps protect the airend and lubrication-dependent components.
• Supports oil cleanliness in rotary screw compressor systems.
• Associated with selected EP75 and EP100 compressor installations.
• Suitable for scheduled oil filtration maintenance.
• Helps reduce the circulation of abrasive wear particles.
• Supports routine servicing of industrial compressor lubrication circuits.

Technical FAQs

Which Ingersoll Rand compressors use the 39911631 oil filter element?

The 39911631 is commonly associated with EP75 and EP100 rotary screw compressors. It is also listed for selected HP, XP, HXP, and EPE configurations. However, different oil filter versions were used across these compressor families, so the complete model and serial number should be checked before ordering a replacement.

Is Ingersoll Rand 39911631 the same as part number 39796982?

Part number 39796982 is listed as a historical reference associated with the 39911631 replacement. This relationship applies to the relevant compressor parts configurations. The original parts documentation should still be checked to ensure that the replacement corresponds to the installed lubrication system.

What happens if the 39911631 oil filter becomes clogged?

As contaminants accumulate in the filter media, resistance to oil flow increases. Excessive restriction can affect lubricant circulation and may lead to insufficient oil supply to components requiring cooling, sealing, and lubrication. Monitoring oil pressure and following the prescribed filter replacement schedule helps prevent this condition.

How often should the 39911631 oil filter element be replaced?

A commonly listed maintenance recommendation for the associated EP75 and EP100 compressor applications is every 2,000 operating hours or once per year, whichever comes first. Actual replacement timing should follow the maintenance requirements for the specific compressor model and operating conditions. Oil condition and contamination levels should also be considered during servicing.