HARLEY-DAVIDSON 25302-37 Ulh Scavenger Pinion Oil Pump Drive Gear

( Brand: Harley-davidson ), ( Manufacturer Part Number: 25302-37 ), ( Part Type: Pinion Oil Pump Drive Gear )

Review HARLEY DAVIDSON Ul Ulh Scavenger Pinion Oil Pump Drive Gear fits 1937-48

The **Harley-Davidson 25302-37 1937-48 ULH Scavenger Pinion Oil Pump Drive Gear** is a meticulously crafted, period-correct component designed to restore authenticity and performance to the iconic **1937 1948 Ultra Limited Harley-Davidson (ULH)** models. This gear serves as the critical transmission element between the engine s scavenger pump and the oil pump drive, ensuring proper lubrication and functionality within the classic V-twin powerplant. Crafted from high-quality, heat-treated steel, this gear is forged to Harley-Davidson s original specifications, guaranteeing precise fitment and durability that matches the robustness of the original parts used in the era s legendary motorcycles. The gear s intricate design features a **scavenger pinion cut** tailored specifically for the ULH s unique engine architecture, allowing seamless engagement with the oil pump drive mechanism while maintaining the correct gear ratio for optimal oil circulation. Whether restoring a vintage Harley to its former glory or upgrading an existing build, this gear is an essential component for enthusiasts seeking both mechanical integrity and historical accuracy. Its precise machining and attention to detail ensure smooth operation, reducing friction and wear while preserving the timeless character of these legendary machines. For collectors, restorers, and riders who demand nothing less than perfection, this part embodies the uncompromising quality that defines Harley-Davidson s legacy.

Buying the **Harley-Davidson 25302-37 (1937-48 ULH Scavenger Pinion Oil Pump Drive Gear)** is a specialized purchase primarily for vintage Harley-Davidson restoration or repair projects. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

---

### **Pros**

1. **Authentic Restoration Part**

The gear is a genuine, factory-produced component designed specifically for Harley-Davidson s **1937 1948 ULH (Universal Lead) engine models**. For collectors, restorers, or enthusiasts working on original or period-correct builds, this part ensures historical accuracy and proper fitment without modern modifications.

2. **Durability and Reliability**

Harley-Davidson parts from this era were built to last, often featuring robust construction with hardened steel or cast iron. The pinion gear and oil pump drive gear were designed to withstand the mechanical stresses of early Harley engines, which were known for their durability in their time.

3. **Compatibility with Classic Engines**

The ULH engine was widely used in Harley-Davidson models like the **Service, UL, and ULH models**, including the famous **1930s 1940s WLA, WLC, and WLD military bikes**. Owning this part guarantees compatibility with these engines, which are highly sought after in the vintage motorcycle market.

4. **Preservation of Mechanical Heritage**

For those passionate about motorcycle history, sourcing original parts like this gear helps preserve the mechanical integrity of classic Harleys. It avoids the need for aftermarket replicas or modern adaptations that may compromise the bike s original character.

5. **Potential Investment Value**

Vintage Harley-Davidson parts, especially those from the pre-war era, can appreciate in value over time. If the market for classic Harleys continues to grow, this gear could become more valuable as supply dwindles.

6. **Ease of Installation (For Skilled Mechanics)**

While installation may require some mechanical expertise, the gear is designed to fit standard ULH engine layouts. Restorers familiar with these engines will find it relatively straightforward to integrate into the drivetrain, especially if the rest of the engine is already disassembled.

---

### **Cons**

1. **High Cost Relative to Modern Alternatives**

Original vintage Harley parts, especially those from the 1930s 1940s, are significantly more expensive than modern or aftermarket replacements. The 25302-37 gear may cost **hundreds of dollars**, whereas a modern replica or a rebuilt aftermarket part could be far cheaper. This makes it a less practical choice for budget-conscious restorations.

2. **Limited Availability and Sourcing Challenges**

Finding an original 1937 1948 Harley gear in good condition can be difficult. Many parts from this era have been lost to time, corrosion, or have been repurposed in other projects. Sellers may charge premium prices for rare or well-preserved examples, and the search may require extensive networking within vintage motorcycle forums or auctions.

3. **Potential for Wear or Damage**

Even if the gear is original, it may have been exposed to decades of use, rust, or improper storage. Purchasing a used part without a thorough inspection could result in hidden damage (e.g., pitting, cracks, or worn teeth), requiring additional time and money to refurbish or replace.

4. **No Warranty or Guarantee**

Unlike new OEM or aftermarket parts, vintage Harley gears typically come with no warranty. If the part fails shortly after installation due to inherent flaws or improper handling there is no recourse for replacement or refund.

5. **Skill and Time Investment Required**

Installing this gear may demand advanced mechanical skills, especially if the engine is being restored from a neglected state. Misalignment, improper lubrication, or incorrect torque settings could lead to premature wear or failure. Restorers without experience in vintage Harley engines may need to consult specialists or spend additional time learning the process.

6. **Ethical and Practical Concerns**

Some enthusiasts debate the ethics of sourcing original vintage parts, as it contributes to the depletion of available stock. While this gear is not irreplaceable, its removal from the market reduces future options for other restorers. Aftermarket replicas or modern reproductions (while not identical) can be a more sustainable alternative.

---

### **Conclusion**

The **Harley-Davidson 25302-37 (1937 48 ULH Scavenger Pinion Oil Pump Drive Gear)** is a highly desirable part for those committed to **authentic, period-correct restorations** of classic Harley-Davidson engines. Its historical significance, durability, and compatibility make it ideal for collectors, historians, or enthusiasts who prioritize originality over cost or convenience. However, the part s **high cost, limited availability, potential for wear, and lack of warranty** make it a less practical choice for casual restorers or those working on a tight budget.

For most modern restorations or projects where budget and practicality are concerns, aftermarket replicas or modern reproductions may offer a more accessible solution without sacrificing too much authenticity. That said, if you are restoring a **rare or highly valued vintage Harley** and have the resources to source and install an original part, the 25302-37 gear remains a premium choice for preserving the bike s heritage.

---

### **Recommendation**

- You are restoring a **high-value, rare, or historically significant** Harley-Davidson from 1937 1948.

- You have **access to a reliable source** (e.g., a trusted vintage parts dealer, auction, or private seller with a proven track record).

- You are **willing to invest the time and money** to ensure the part is in good condition and properly installed.

- You prioritize **historical accuracy** over cost savings.

- You are working on a **budget-friendly restoration** or a bike that does not require full period authenticity.

- You cannot verify the **condition or provenance** of the part, risking hidden damage or misrepresentation.

- You lack the **mechanical expertise** to install it correctly, potentially voiding the restoration s integrity.

- You prefer **aftermarket replicas** (e.g., from companies like **Harley-Davidson Museum Store, Classic Harley Parts, or specialty vendors**) that offer warranties and modern quality controls.

For most enthusiasts, a **balance between originality and practicality** is key. If the 25302-37 gear is critical to your project and you can source it responsibly, it is a worthwhile investment. Otherwise, explore aftermarket options that align better with your budget and goals.

Details:

Matt Walkers from Dales Wheels Through Time and I work together to find parts motorcycles. Combined shipping is one of the biggest requests we get which absolutely do for everyone as long you know rules. NOS does not always translate into OEM or original equipment manufacturer. Any questions or confusion just message me.

Original used gear, looks very good to me, little no signs of use/wear. Local pick-up is available, please coordinate with us as needed. For example, we acquire unused aftermarket parts that are from the 80's. See pics for more details.

Raffle tickets are used solely for inventory purposes.

part #: 2530237 prices

• $25.70-$98.00

specifications cyclevintagee:

• for makes: Harley
• for years: 1937-48
• brand: Harley-davidson
• mpn: 25302-37
• part type: Pinion Oil Pump Drive Gear

shipping cyclevintagee:

• service: USPS Ground Advantage
• cost: $5.99
• class: Standard
• transit: 4-8 Days
• type: Fixed
• carrier: USPS

payments cyclevintagee:

• money order
• cash
• credit card: Visa
• wallet: Google-pay
• other

returns cyclevintagee:

• paid by: Seller
• time: 30 Days
• policy: Returns Accepted

seller cyclevintagee:

• rating: 99.9%
• city: Arden, North Carolina
• # reviews: 48843

offer cyclevintagee:

• quantity: 1
• options: Ship-to-home
• availability: In Stock
• started: February 22, 2026
• sold: 0

general cyclevintagee:

• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories
• condition: Used

Harley-davidson 25302-37 Is Similar To:

• 1 27125-70p 1 Aermacchi Harley-davidson 1970 Harley Rapido-125cc (30.2% similar) Carb dirty needs rebuild probably has been sitting for years as pictured any questions ask thanks...(February 25th, 2018)
• 265-24 265-24 Harley Davidson 1924 Dcb (28.6% similar) Part 1LB OS set of rings fits 1924 to motors there is no rust 1937 twins compression 4 per box offer for 2 boxes. 1924 CB motors new old stock in box piston rings...(January 4th, 2018)
• 33701-71a 33701-71a Harley-davidson Sportster-xlch New Old (41.8% similar) Sportswear-zilch new old stock sprocket assembly. It is original harley and fits. Part 71A 10LBS. This is for kick and electric start. This is hard to find...(November 15th, 2017)
• 3371-36 3371-36 Harley-davidson Harley Davidson Throttle (46.4% similar) This is a throttle cable bracket for 1936-UP harley Davidson's. I also have one un chromed. It has been chromed...(November 25th, 2017)
• 3509-16 Early Harley Gas Oil Cap Leather Gaskets Jd Single Vl (29.5% similar) Made in USA and free shipping...(January 15th, 2019)
• 41483-66p Dixie Nos Harley Davidson Aermacchi Tooth Wheel Sprocket (28.6% similar) Harley davidson armchair rear sprocket 27 65P later new old stock...(June 5th, 2018)
• 46050-59a 46050-59a Harley-davidson Topper New Old (34.5% similar) Topper new old stock in box front fork spring kit original end fits there is no rust comes with bolt and spacer great. Part 59A 2LB...(December 25th, 2017)
• 62129-75 Harley Davidson Gas Petcock (29% similar) Going through boxes listing as they come out. Will combined ship. Fuel line straight down. More to come. Needs a good cleaning came off original mid 70S preclude tank single passages are, has factory nut and filter. Selling all harley parts packed away 20 yrs ago...(July 23rd, 2017)
• 6524 X 19 6524 Harley-davidson Harley (39.4% similar) Do not pay before I have a chance to box and weigh. Genuine original nos x 19 1/6 4, plain steel washers. Thanks, zeal. All questions answered within 24 hours. I ship worldwide. Also work great for chiming motor mounts. I will use USPS and ship the cheapest way possible...(September 14th, 2017)
• 68549-73p 68549-73p Aermacchi Harley-davidson 1975 Harley (28.9% similar) ...(July 27th, 2017)
• 70271-98cp Daytona Harley Davidson Chrome Switch Kit Cruise Acc Spot Speaker (26.9% similar) Chrome switch kit 98CP acct, spot, speakers, cruise as-is no returns...(November 19th, 2018)