FG Wilson Generator Set Filters Guide

FG Wilson at a Glance

FG Wilson is one of the world's best-known diesel generator brands. It was founded in 1966 by Fred Wilson in Northern Ireland, moved into a large facility in Larne in 1993, and has been a wholly owned subsidiary of Caterpillar since 2000. Its generator sets range from 6.8 to 2,500 kVA and are built in Northern Ireland, Brazil, China, and India, and installed in more than 150 countries.

Why FG Wilson Filter Numbers Cross to Perkins

Because FG Wilson generator sets are built around Perkins engines, FG Wilson filter part numbers usually correspond to a Perkins filter. A technician looking at an FG Wilson part number can often find the matching Perkins number, and the reverse. This is why the same filter is sold under both names, and why you should identify a filter by engine model rather than only by the genset brand.

Common FG Wilson Filter Part Numbers

While exact filter part numbers depend on the specific generator model and engine build, the following FG Wilson numbers appear frequently in generator set maintenance:

Oil Filters

• 996-452 – Corresponds to Perkins CH10929, used on larger 2000 series engines such as the 2206, 2306, 2506 and 2806
• 901-102 – Corresponds to Perkins 2654403, a widely used spin-on oil filter for 1000 series and 1103 engines
• 901-136 (also 10000-51283) – A spin-on oil filter listed as equivalent to Perkins SE111B, used on a range of FG Wilson sets

Fuel Filters

• 996-453 and 996-454 – Correspond to Perkins CH10930 and CH10931, used with the 2000 series oil filter
• 10000-59646 (previously 10000-12854) – Corresponds to Perkins 2656F843 and Cat 299-8229, used on 1100 series engines such as the 1104D-E44T and 1106D-E66TA
• 10000-51229 (previously 901-243) – Corresponds to Perkins 26560137 and is listed for the Perkins 1306 model

Air Filters

• 901-048 (also 997-704) – Corresponds to Perkins 26510342, used on 1000 series and 1104 engines
• 901-054 – Corresponds to Perkins 26510353, commonly used on 135 to 150 kVA sets
• 934-694 – Corresponds to Perkins 5543095, used on smaller 400 series sets such as the 404D-22G
• 915671 – Corresponds to Perkins 26510380 radial seal outer element

These numbers are useful references when identifying the correct replacement. Always confirm the exact filter by engine serial number or existing filter part number when possible.

FG Wilson to Perkins Quick Reference

FG Wilson Filter Maintenance

Oil and fuel filters. Replace oil and fuel filters at the intervals in the generator's manual, and always together with the oil change. For 2000 series sets, replace the oil filter and both fuel filters as a set.

Air filters. Replace air filters when the restriction indicator trips, or on schedule. Generator rooms with poor ventilation or sets in dusty sites need much shorter intervals.

Standby sets. Many FG Wilson sets serve as standby units in hospitals, data centres, and buildings and may run only a few hours a year. Replace filters at least annually and keep the fuel clean.

Service intervals depend on the engine model, oil specification, fuel quality, load profile, and whether the generator set is used for standby, prime, or continuous duty. Always follow the operation and maintenance manual for your specific generator set.

How to Identify the Correct Filter for an FG Wilson Generator

• Find the generator model and serial number on the genset nameplate, and the engine model and serial number on the Perkins engine data plate.
• Use the engine model to find the Perkins filter number, then check the FG Wilson cross-reference.
• Compare the old filter's part number, size, and thread against the replacement.
• Keep spares of the most commonly replaced filters for each model on site.

Frequently Asked Questions

Are FG Wilson and Perkins filters the same? In most cases, FG Wilson filter numbers correspond to Perkins filters, because FG Wilson generator sets are built around Perkins engines. The numbers differ but the filter is the same.

What oil filter does a larger FG Wilson set use? On generator sets with Perkins 2206, 2306, 2506 or 2806 engines, the oil filter is commonly FG Wilson 996-452, which corresponds to Perkins CH10929.

Is FG Wilson owned by Caterpillar? Yes. FG Wilson has been a wholly owned subsidiary of Caterpillar since 2000, and Perkins is also part of Caterpillar.

Can aftermarket filters be used on FG Wilson generators? Yes, if they meet or exceed the original specification for efficiency, flow, and bypass settings. Check warranty and service-agreement terms first.

For generator set owners, rental companies, and distributors sourcing replacement filters for FG Wilson engines and generator sets, ADAOER Filter manufactures fuel, oil, air, and hydraulic filters for generator sets and other diesel machinery, and supports OEM/ODM development for custom specifications. Cross-reference lists are available on request.

Brand names and part numbers are used for identification and compatibility reference only. Caterpillar, Cat, Perkins, Cummins, Fleetguard, and FG Wilson are trademarks of their respective owners. Part numbers vary by engine series, build, and production date, so always verify the correct filter against the engine serial number or the existing filter before ordering.