McCauley D-20594, Pump Idler Drive Gear Assembly - Tempest PMA
Tempest AGD-20594-PMA
The Tempest AGD-20594 (McCauley OEM D-20594) is an FAA-PMA replacement pump idler drive gear assembly for McCauley applications.
- Supports reliable governor operation by maintaining correct gear mesh and motion transfer within the governor drive train.
- Helps address wear-related issues when inspection shows chipped teeth, pitting, scoring, or abnormal wear patterns that can affect drive smoothness and internal performance.
- Often replaced during overhaul when gear condition is out of limits or when matched gear components require replacement as a set per approved data.
Drive gear condition matters in aircraft governor service because gear wear can show up as rough operation, accelerated wear debris, and inconsistent performance over time.
Installation notes
Always refer to the approved maintenance and overhaul manual for full installation guidance before starting work.
- Inspect mating gears, shafts, and bearings for matched wear and replace components as required by approved overhaul data.
- After assembly, perform the functional checks specified in approved maintenance data to confirm smooth drive operation and correct governor performance.
Applications and fitment
Used on McCauley governors where OEM D-20594 is specified. Confirm compatibility by matching the OEM part number and verifying governor model and serial number eligibility in the approved maintenance data.
Tempest AGD-20594 is the direct replacement for OEM D-20594. Match the OEM part number and confirm applicability by governor model and serial number in the approved maintenance data.
Pilot John International carries Tempest PMA propeller governor parts for FBOs, propeller overhaul shops, and aviation technicians supporting aircraft maintenance and ground support work.
| General Information | |
|---|---|
| Part # | AGD-20594 |
| Manufacturer | Tempest |
| Shipping Information | |
|---|---|
| Product Weight | 0.2 lbs. |
| Product Dimensions | 5 x 2 x 1 in. |
| Schedule B | 8807300010 |
| ECCN | 9A991.d |
| Specifications | |
|---|---|
| Approval | FAA-PMA replacement part |
| OEM P/N | D-20594 |
| System | McCauley propeller governor, drive train and pump drive section |
| Tempest P/N | AGD-20594 |
| Type | Pump idler drive gear assembly |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* | |
|---|---|
| Cessna | 310 , 421C |
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QUESTIONS & ANSWERS
Tempest AGD-20594 is a direct FAA-PMA replacement for McCauley P/N D-20594. Always verify compatibility with your specific propeller governor model and applicable maintenance documentation before placing an order.
The Tempest AGD-20594 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-20594 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-20594 as an FAA-PMA-approved replacement for the McCauley D-20594 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.
