DOFF10300JR - Hartzell 150 Volts 60 Amp Alternator

DOFF10300JR – Hartzell Engine Tech 60 Amp Alternator

Part Number: DOFF10300JR

Manufacturer: Hartzell Engine Technologies (Overhauled Ford Legacy)

Common Synonyms: 14V 60A Ford Alternator, Belt-Driven Alternator, C611501-0101 (Cross-Ref)

Overview Section

The DOFF10300JR is a factory-overhauled Hartzell Engine Tech alternator originally based on the Ford "Small Frame" design. It is a workhorse of the general aviation fleet, specifically engineered for 14-volt electrical systems (often referred to as 15V in charging specifications). This unit is belt-driven, meaning it mounts to the engine via standard brackets and receives power from the crankshaft pulley.

Unlike the "F" variant (Gear-Driven), the "J" variant is the primary choice for older Cessna and Piper aircraft that utilize a V-belt drive. The "R" suffix indicates that the unit has been factory overhauled by Hartzell to meet modern FAA-PMA standards, ensuring that all mandatory wear parts—such as brushes, bearings, and diodes—have been replaced with new components.

Enhanced Technical Data

Advanced Engineering & Structural Application

The DOFF10300JR is engineered for Direct Replacement Reliability.7 While modern alternators like the Plane-Power series are lighter, the DOFF10300JR is the preferred choice for owners who want to maintain the original factory mounting brackets and wiring harness configuration without the need for an STC (Supplemental Type Certificate) modification.

Engineering Insight: The 14V Charging Logic

Although often labeled as a "15V" alternator, this unit is designed to charge a standard 12V lead-acid battery. The 15V design rating allows for the voltage "overhead" required to overcome resistance in the aircraft’s wiring and ensures the battery receives a steady 14.2V to 14.4V during high-draw operations (e.g., nighttime flight with landing lights and pitot heat active).

Overhaul Quality Standards

Hartzell’s overhaul process for the DOFF10300JR includes a magnetic particle inspection of the rotor shaft and a dynamic balance of the fan assembly. This prevents the high-frequency vibrations that commonly lead to bracket cracking in belt-driven installations.

Aircraft Compatibility

The DOFF10300JR was the "gold standard" factory-installed alternator for single-engine Cessnas in the 1970s and 1980s:

• Cessna 172 (Skyhawk): Models L, M, N, and P.

• Cessna 182 (Skylane): Models P, Q, and R.

• Cessna 206 (Stationair): Various 14V belt-driven configurations.

• Piper Aircraft: Compatible with certain PA-28 and PA-32 models (verify via IPC).

• Experimental Aircraft: Frequently used in "Firewall Forward" kits for Lycoming O-320 and O-360 engines.

The Hartzell DOFF10300JR is the definitive solution for restoring the electrical health of your legacy Cessna or Piper. When your original Ford-style alternator fails, the DOFF10300JR provides a cost-effective, factory-overhauled path back to airworthiness without the complexity of a modern alternator conversion.12 Each unit is meticulously refurbished to provide 60 amps of stable DC power, protecting your sensitive avionics suite and ensuring your battery remains fully charged during all phases of flight.13 Trust the aviation experts at Hartzell to provide the OEM reliability and fitment your airframe was designed for.

Installation & Maintenance Addendum

1. Belt Tension: Correct V-belt tension is critical.14 A belt that is too tight will cause premature failure of the front bearing on the DOFF10300JR, while a loose belt will cause "slippage" and reduced current output during high-load events.

   
   

   
   

2. Core Return: This is an Exchange part. To receive your core credit, the returned unit must be a "like" model (Ford/Hartzell 60A) and must be returned in an assembled, as-removed condition.

3. Voltage Regulator: It is highly recommended to inspect or replace the voltage regulator (e.g., Zeftronics R15100 series) when installing a new alternator. A faulty regulator is often the hidden cause of "failed" alternators.

Description:   Ford Alternator (Overhauled)
Part number:   DOFF10300JR
Alternate PN:   DOFF10300J, C611501-0102, C611501-0102RX 

Product Overview: 

Factory Overhauled Ford Alternators.

Product Specification:

Fits in Aircraft models:

Related Documents:

Overhauled Exchanged Alternators:   [ Click here ]

AirParts stocks thousands of engine and engine overhaul parts. Cranks, cases, cams, cylinders, and more. Most available on exchange programs.