How to Check Harley 6-Speed Transmission Oil Capacity

When you ride different Harleys, you will experience the difference between motorcycles. One is capable of carrying heavy weights, and one can take on more weight.

The former can carry heavier payloads and accelerate at high speeds. Meanwhile, the later handles the load easily and enjoys a top speed of around 80 to 90 miles per hour. If you own a Harley-Davidson motorcycle, you must change your transmission oil at some point. Transmission oil is a lubricant that helps the transmission move gears more smoothly and prevents them from slipping.

The oil also helps to prevent metal-to-metal contact, which can damage your transmission. Here, we will tell you how to check the Harley 6-speed transmission oil capacity. And the symptoms of low transmission oil capacity. We will also tell you how you can increase how to check Harley 6-Speed transmission oil capacity for better performance.

Harley 6-Speed Transmission Oil Capacity

What Is Transmission Fluid?

What Is Transmission Fluid

Transmission fluid is a vital component in the operation of an automobile’s transmission system. It acts as a lubricant, keeping the gears and other internal components running smoothly. To check the fluid level, refer to the vehicle’s Owners Manual for specific instructions. One way to check is by the mark on dipstick.

Simply insert the dipstick into the transmission, wipe it clean, reinsert it, and then remove it again to see the mark on the dipstick. The fluid should reach that mark. If it’s low, adding a strand of chain can help to indicate the proper level.

When checking the transmission oil capacity of a Harley 6-Speed, it is important first to gather the necessary tools and equipment. These include a transmission dipstick, a socket wrench with a 5/8-inch socket, and a primary chain adjustment tool. It is also important to ensure the bike is hot before checking the oil’s proper level.

What Is Harley 6-Speed Transmission Oil Capacity?

What Is Harley 6-Speed Transmission Oil Capacity

Transmission fluid is a vital component in a vehicle’s transmission system. It acts as a lubricant, ensuring smooth operation of the gears and other moving parts. The dipstick will have a mark indicating the appropriate level of transmission fluid. If the level is low, add the recommended 20w-50 engine oil until it reaches the required level.

The Harley 6-speed transmission oil capacity can vary based on model and year. Consult the manual or a dealership for accurate information. Generally, it ranges from 24 to 32 fluid ounces. Use specified oil for optimal performance and follow the manufacturer’s guidelines for maintenance.

If the level is low, add the recommended 20w-50 engine oil until it reaches the correct level on the dipstick. Be careful not to overfill. Double-check the levels for engine oil before replacing the dipstick. It is important to stick to the recommended guidelines to maintain the transmission’s performance and longevity.

How to Check Harley 6-Speed Transmission Oil Capacity

Ways To Check Harley 6 Speed Transmission Oil Capacity

The capacity of a Harley 6-speed transmission oil can vary depending on the type of motorcycle you mounted on. However, most motorcycle manuals recommend using at least 3.0 quarts (3.7L) of transmission oil per season to keep your bike running smoothly.

The type of oil that you may use in a Harley-Davidson motorcycle is manual transmission fluid. This type of oil suits how to check Harley 6-Speed transmission oil capacity well because it has a higher viscosity and better lubrication than automatic transmission fluid.

Synthetic transmission fluids are generally superior to manual transmission fluid for air-cooled motorcycles like the Harley 6-speed. The reason is that synthetic fluids maintain viscosity over a wider temperature range, making them better suited for high-performance motorcycles.

To check the oil capacity of a Harley 6-Speed Transmission, start by ensuring that your motorcycle is on a level surface. Locate the dipstick on the transmission and remove it. Wipe it clean and reinsert it. Then, remove it again and check the oil level. The dipstick will have markings indicating the proper level of oil. If the oil level is low, you can add Amsoil 20w-50 engine oil as recommended in the Owner’s Manual. Remember also to check the primary fluid and chain lubricant levels to ensure optimal performance.

Shake The Transmission Fluid Level And Inspect For Dirt/Grind Residue

Shake The Transmission Fluid Level And Inspect For Dirt-Grind Residue

It is important to maintain the proper fluid level in the transmission. This can help lubricate the gears properly and have enough lubrication to function properly. If the transmission fluid level is low, it could indicate a leak or a problem with the transmission fluid.

In some cases, replacing the transmission fluid or filter may be necessary. If there are no leaks and the transmission fluid looks clean, it may be time to clean the transmission thoroughly. You can do this using an Automatic Transmission Fluid Cleaner or Automatic Transmission Fluid Degreaser.

Look At The Transmission Pan Or Sump

Look at the transmission pan or sump to see how well it lubricates the fluid. You will want to look for any signs of oil leaking from the pan or visible signs of sludge buildup, such as a brownish-green or yellowish appearance.

Additionally, you should pay attention to the transmission fluid level in the pan or sump and ensure it does not flow out of the dipstick. If you notice any of these issues, you may have a problem with the transmission and need to take it to a mechanic for proper diagnostics and repair.

Remove The Transmission Fluid And Measure It With A Hydrometer

Disengaging the transmission fluid is probably not a good idea. You might damage the transmission or cause an accident. Instead, it would help to have your vehicle serviced or repaired by a professional. They can determine whether the transmission needs to be replaced or repaired and take appropriate steps to ensure your vehicle is safe to drive.

One way to tell if the transmission needs to be serviced is to check the transmission fluid level. You can do this by removing the cap from the reservoir and pouring a few drops of fluid into a glass or hydrometer test tube.

Listen For The ‘Jerk’ Sound Of Fluid Moving Through The System

While rotating the transmission, listen for the ‘jerk’ sound of fluid moving through the system. The oil is low if there is no audible ‘jerk’ sound. Fluid moving through a transmission system is called the ‘jerk’ sound.

The sound is caused by the rapid movement of oil and other fluids in the transmission, which can be heard as a high-pitched whine or hissing noise. If there is no audible jerk sound, it could mean that the transmission fluid is low or may need to be replaced.

Check Its Flashpoint

Check Its Flashpoint

As a general rule, synthetic transmission oil suits all weather conditions. It provides added protection against wear and tear, rust, and corrosion. However, check its flashpoint if you wish to use a high-performance synthetic fluid.

A fluid with a high flashpoint will protect against gear damage at high temperatures. Check its flashpoint, which is a tool to determine when an oil or other substance begins to smoke, ignite, or become volatile. It is typically done by placing the substance in a closed container and heating it to different temperatures. The temperature at which the substance begins to smoke or ignite is popular as its flashpoint.

Symptoms Of Low Transmission Oil Capacity

Symptoms Of Low Transmission Oil Capacity

Low transmission oil capacity in a Harley 6-speed Transmission can cause several symptoms that indicate it’s time for a service. Regularly checking and maintaining proper fluid levels in HD transmissions is essential for optimal performance and longevity of your motorcycle’s drivetrain components. These symptoms may include:

  • Difficulty shifting gears
  • Noisy transmission
  • Leaking fluids

To check the oil capacity, follow these steps:

  1. Locate the transmission drain plug on your Harley. It is typically located on the bottom of the transmission cover case.
  2. Place an oil pan underneath the drain plug to catch any fluid that drains out.
  3. Remove the drain plug using a suitable wrench or socket. Allow the old oil to drain completely into the pan.
  4. Once all the old oil has drained out, reinstall the drain spark plugs in the Electra Glide securely.
  5. Refer to your Harley’s owner’s manual or consult a professional to determine the correct amount of primary and transmission fluids needed for your specific model.
  6. Add the recommended amount of fluid through the appropriate fill port on your motorcycle.
  7. Double-check for leaks and ensure that all connections are tightened properly.

How To Increase The Transmission Oil Capacity Of Your Harley?

How To Increase The Transmission Oil Capacity Of Your Harley

Increasing the transmission oil capacity of your Harley can help improve its performance and extend the life of your bike. Remember, it is always recommended to consult your Harley owner’s manual or seek advice from professional Harley mechanics when modifying or adjusting your bike’s transmission system. Here are some steps to guide you through the process:

  • Start by warming up your bike.
  • Check the current oil level.
  • Drain excess oil if necessary.
  • Add additional transmission fluid.
  • Replace and secure the dipstick.

How Does Harley Transmission Work?

The Harley transmission is a mechanical device with gears, shafts, and clutches that facilitate power transmission from one speed to another. This transmission type is useful in many types of vehicles, such as motorcycles and cars.

Transmission fluid is a cooling agent that keeps the transmission system cool even at high speeds. Premium transmission oil is important to protect the transmission and keep it running smoothly. Using poor-quality transmission oil can damage the Harley Davidson 6-speed transmission. A Harley-Davidson transmission oil’s most commonly used viscosity is 20W50 or 40W60. People determine engine oil weight by its viscosity, which is the thickness of the oil.

How Much Does A Bottle Of Motor Oil Cost?

How Much Does A Bottle Of Motor Oil Cost

In terms of pricing, the cost of a motor oil bottle can vary depending on the brand and quality. On average, a bottle of motor oil for a Harley 6-Speed can range from $10 to $20. However, checking with local shops or online retailers for specific pricing information is always recommended.

It is worth noting that checking the transmission oil level capacity should be done carefully and accurately to ensure optimal performance and longevity of your bike. Suppose you are unsure or uncomfortable performing this task. In that case, it is always best to consult a professional technician or seek assistance from an authorized Harley-Davidson service centre to avoid potential issues or accidents.


How to check Harley 6-Speed transmission oil capacity is an essential maintenance task that every owner should know how to do. Following the steps outlined in this guide, you can ensure your transmission is properly lubricated and functioning at its best.

Always refer to your owner’s manual for specific instructions and recommendations. Whether you’re a seasoned rider or a newbie, taking care of your Harley is crucial for optimal performance and longevity. So, grab your tools, call up your drunken buddy or circus freak (if they’re handy with motorcycles), and get ready to check that transmission oil like a pro.

Frequently Asked Questions

How Much Oil Does A Harley 6-speed Transmission Hold?

A Harley 6-speed transmission typically holds around 32 to 36 ounces of oil. It’s important to consult your owner’s manual or a Harley-Davidson dealer for the specific oil capacity for your model.

How To Check Transmission Fluid?

To check the transmission fluid, park your vehicle on a level surface and leave the engine running. Locate the transmission dipstick, usually near the back of the engine. Remove the dipstick, wipe it clean, reinsert it, and then remove it to check the fluid level.

Can I Use 20w50 In Harley Transmission?

No, we do not recommend using 20w50 oil in a Harley transmission. Harley-Davidson recommends using a transmission-specific oil that meets their specifications for optimal performance and protection.

How Many Ounces Is A Harley Transmission?

The weight of a Harley transmission can vary depending on the specific model and type. However, a Harley transmission typically weighs around 40 to 50 pounds on average.

What Is The Gear Ratio On A Harley 6-speed Transmission?

The gear ratio on a Harley 6-speed transmission can vary depending on the specific model and year. Generally, the gear ratios are designed to balance power and smoothness for optimal performance and riding experience.

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