McCauley C-20594B, Pump Idler Gear Assembly - Tempest PMA
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Tempest AGD-20594B-PMA
The Tempest AGD-20594B (McCauley OEM C-20594B) is an FAA-PMA replacement pump idler gear assembly for McCauley applications.
- Supports reliable oil pump drive transfer, helping the governor maintain consistent hydraulic pressure for propeller pitch control and RPM stability.
- Common overhaul replacement when gear wear, scoring, bearing surface damage, or looseness introduces efficiency loss or metal contamination risk.
- Improves service consistency in governor rebuilds by restoring correct fit and motion in the pump drive train.
In aviation maintenance, idler gear condition directly affects pump output and the governor’s ability to respond crisply to RPM demands. This assembly is intended for aircraft constant speed propeller governor maintenance and overhaul support, including GA twins and other airframes using McCauley governors.
Installation notes
Always refer to the approved maintenance and overhaul manual for full installation guidance before starting work.
- Inspect adjacent gears, the idler stud, and bearing surfaces for wear patterns or metal transfer before installation.
- Follow approved cleaning practices to prevent debris from entering the oil pump and pilot valve circuits.
- After installation, perform the required pump output and governor functional checks per approved data.
Applications and fitment
This component supports aviation maintenance and overhaul workflows where Tempest and OEM part numbers are used to cross reference McCauley governor internals. Distributor eligibility charts commonly associate the AGD-20594 family with installations where DCFU290D7 McCauley reciprocating engine speed governors are installed (examples include certain Cessna 310 series and Cessna 421C ranges). Confirm compatibility by matching the OEM part number and verifying governor model eligibility and serial number applicability in approved data.
Tempest AGD-20594B is used as the replacement for OEM C-20594B. Some supplier catalogs may reference D-20594B for the same configuration. Always confirm eligibility by governor model and approved illustrated parts data.
Pilot John International stocks Tempest PMA propeller governor parts for propeller overhaul shops, MROs, FBOs, and A&P mechanics supporting aircraft maintenance and ground support operations.
| General Information | |
|---|---|
| Part # | AGD-20594B |
| Manufacturer | Tempest |
| Specifications | |
|---|---|
| Approval basis | FAA-PMA (listed for the AGD-20594 family by major aviation parts distributors) |
| Description | Pump idler gear assembly (governor oil pump drive train component) |
| Material and finish | Manufactured to the applicable OEM specification for hardness, wear performance, and dimensional accuracy. Verify gear and bearing inspection limits and any special callouts in the approved governor manual. |
| Notes on nomenclature | Some catalogs list this as a blank configuration and reference the McCauley style number D-20594B. Match by function and approved illustrated parts data for your specific governor model. |
| OEM P/N | C-20594B |
| Tempest P/N | AGD-20594B |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 310 |
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QUESTIONS & ANSWERS
Tempest AGD-20594B is a direct FAA-PMA replacement for McCauley P/N D-20594B. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGD-20594B Pump Idler Drive Gear Assembly is designed for use in aircraft equipped with McCauley model DCFU290D7 propeller governors. Matching replacement parts to the correct governor model is essential to ensure proper fit, function, and reliable operation.
The Tempest AGD-20594B Pump Idler Drive Gear Assembly transmits driving torque within the governor’s oil pump, ensuring the pump is mechanically powered during operation. Proper drive gear engagement is essential for consistent oil pressure generation, which directly supports accurate RPM control and stable propeller governor performance.
PJi offers the Tempest AGD-20594B as an FAA-PMA-approved replacement for the McCauley D-20594B pump idler drive gear assembly. View our full selection of Tempest propeller governor parts to find the correct component for your application.
For a deeper look at how propeller governors work, why proper maintenance matters, and how to identify compatible replacement components, refer to our Ultimate Guide to Aircraft Propeller Governor Maintenance.
