Baldwin PT9129, direct aftermarket replacement. This filter is an aftermarket oil filter designed as a direct replacement for popular brands including Argo, Baldwin, Digoema, Donaldson, Fai Filtri, Fleetguard, Liebherr, Linde, Oxfil, and Woodgate. It features impregnated paper media with a 25 µm filtration rating, effectively capturing contaminants to protect engine components. With a total height of 230.5 mm, an outer diameter of 109 mm, and a smallest inner diameter of 19 mm, this filter is built to the original dimensions and ratings. The bypass valve opens at 0.7 bar to ensure oil flow during cold starts or clogging. Ideal for Liebherr equipment and other compatible machines, it offers reliable performance at a competitive price.
Technical properties & cross references
Specifications
| Filtration Media |
Impregnated Paper 25 µm |
| Media type |
Impregnated Paper |
| Filtration Rating |
25 µm |
| Total Height |
230.5 mm (9 1/16") |
| Bypass Valve Opening Pressure |
0.7 bar (10 PSI) |
| Smallest Inner Diameter |
19 mm (3/4") |
| Outer Diameter |
109 mm (4 9/32") |
| Stat. HS-Code |
84149000 |
| Country of Manufacture |
China |
Price beat guarantee
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller |
Price |
Checked |
| Oxfil |
USD 47.07 |
16 Oct 2026 |
| FilterFinder Online |
USD 59.00 |
14 Oct 2026 |
| Spare Part Mart |
USD 37.66 |
Today |
Our price of USD 37.66 is 20% to 36% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
Use cases & applications
Heavy-Duty Construction Sites
In dusty and debris-laden environments, the 25 µm impregnated paper media captures fine particles before they can cause wear. This filter helps extend engine life in excavators and loaders operating under continuous heavy loads.
Fleet Maintenance Consistency
Standardising on this filter across multiple machine brands simplifies inventory management. Its cross-reference compatibility with Argo, Baldwin, Donaldson, and others means one filter serves many vehicles, reducing stock complexity.
Cold Climate Start-Ups
The 0.7 bar bypass valve ensures oil circulation when cold, thick oil might otherwise starve the engine. This protects critical components during winter operation in mining or agricultural applications.
Extended Service Intervals
With robust construction and high dirt-holding capacity, this filter supports longer drain intervals in equipment like Liebherr telehandlers. Operators benefit from reduced downtime and lower maintenance costs.
Frequently asked questions
How do I confirm this filter fits my specific machine?
Check your machine's manual or the existing filter part number. This filter cross-references with brands such as Argo, Baldwin, Digoema, Donaldson, Fai Filtri, Fleetguard, Liebherr, Linde, Oxfil, and Woodgate. If your current filter matches one of these, this is a direct replacement.
What is the filtration rating and media type?
This filter uses impregnated paper media with a 25 µm filtration rating. It is designed to capture particles of that size and larger, protecting your engine from abrasive contaminants.
What are the key dimensions and thread specifications?
The total height is 230.5 mm, outer diameter is 109 mm, and smallest inner diameter is 19 mm. Thread size is not specified, but the dimensions match many standard spin-on filters. Verify thread pitch with your application.
Is this an OEM or aftermarket part? How does it compare?
This is an aftermarket filter built to the original dimensions and ratings. It is not a genuine OEM part but is a direct replacement for filters from brands like Donaldson and Fleetguard, offering comparable performance at a lower cost.
How do I install and replace this oil filter?
Installation is similar to standard spin-on filters. Apply a thin coat of oil to the gasket, hand-tighten until the gasket contacts the mounting surface, then tighten an additional 3/4 turn. Always follow your equipment's service manual for proper torque and replacement intervals.