Question about 2000 Harley Davidson FLHTCUI Electra Glide Ultra Classic

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How to repair primary case drain plug - 2000 Harley Davidson FLHTCUI Electra Glide Ultra Classic

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It depends on what size the drain plug is now. You may can simply drill and tap the hole for the next size plug or you may have to have it welded up and then drilled and retapped. Of course, that will ruin any chrome plating on the outer primary. I'd try going to the next size even if it's a screw thread rather than a pipe thread.

Good Luck

Posted on Aug 04, 2010


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1 Answer

Where's the oil drain plug for 2010 low fatboy harley

Which of the three drain plugs. Primary is on primary case below derby cover; transmission is on right side middle bottom of transmission, engine is at bottom of right rear frame down tube intermediately forward of rear tire. ALL are 5/8 inch hex plugs with 1/4 inch Allen socket in the middle of the plug.

Apr 13, 2014 | 2005 Harley Davidson FLSTC - FLSTCI...

1 Answer

My primary casing is very hot. What could be the reason?

The primary case will get hot as there are moving parts inside and it is directly connected to the engine. Check the oil level in your primary. Since you didn't tell me what year and model bike you have, stand the bike straight up. If it's a Big Twin, remove the round derby cover from the back end of the primary and look at the oil level inside. It should be just up to the bottom edge of the clutch outer drum. In the case of a Sportster, simply drain the primary by removing the drain plug under the lower backside of the primary. Remove the small round inspection cover at the top side of the primary cover and add one quart of oil.

Good Luck

Aug 25, 2011 | Harley Davidson FLSTN- FLSTNI Softail...

1 Answer

Why does gears 1 and 5 work normal but 2 thru 4 has a grinding metal sound? sounds pretty bad.Does the trans. have a separate oil resevoir? 2004 883 sportster

Yes the primary case-transmission require it's own oil as the lubricant for this area is not provided by the engine oil. There is a drain plug located at the lower point of the case. Remove the plug and drain any oil that may be in the primary case. When finished, add one quart of oil to the case through the access hole at the top of the primary case where you check the tension on the primary chain.

Good Luck

Aug 01, 2011 | 2004 Harley Davidson XL 883 Sportster

1 Answer

Where is the oil drain and how do you refill tranie fluid

The oil drain on your Sportster should be on left side of the bike below the battery around the rear of the primary case. It'll be a short piece of hose with a metal plug in it or a hose that appears to plug onto the frame. Simple pull the plug or take the hose loose and the oil tank will drain.

On the transmission, you remove the top inspection cover of the primary case to add the oil to it. The primary and the transmission share the same oil.

Good Luck

Apr 25, 2011 | 2004 Harley Davidson XL 883C Sportster...

1 Answer


Primary case drain is at losest point at rear of primary case. Transmission drain is under transmission about the center of tranny. Oil tank drain is a hose from lowest point on tank. It is either plugged by a frame mounted plug, or a plug shoved in the hose. Both methods use a hose clamp to hold the hose to the plug

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1 Answer

Can u please tell me where the oil drain plug is on my 04 harley super glide?? thank u

Engine, primary, or transmission? Primary case drain is on the left side at rear lower part of primary case. Can be an allen or a star nut. Transmission drain is on the right side, under transmission. Engine will also be on right side just forward of the transmission drain, a little left or right. Also some H-D's have a drain hose from the oil tank that has a plug in it. If it has one of these, it will be hanging on the right side of the bike back by the tank.

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1 Answer

Looking for the oil drain plug on my 2006 dyna street bob

you probly drained the primary case oil, which house the primary drive chain and clutch. The main oil is in the oil tank, there should be a drain bolt on the bottom of the tank

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1 Answer

Where is the oil drain plug on 2007 Heritage Softtail Classic and how to change oil?

Look at the bottom of the oil tank from the right side of the bike. You'll see one hose or pipe that goes downwards towards the back of the transmission. The hose will follow the frame and come out way down low on the backside of and slightly under the transmission. There is a plug in the hose or pipe. Take the plug out and the oil tank will drain.

To change the oil, drain the tank, change the oil filter, refill with three quarts of oil in the tank. You also have oil in your primary that should be changed every 5000 miles or so, and the transmission serviced at the same interval as the primary.

To drain the oil on the primary, there is a drain plug under the primary case at the very rear of the case. Remove this to drain the case. Refill the primary through the derby cover. Fill with oil until the level is just to the bottom edge of the clutch spring. 38-42 ounces of oil. Do not overfill or the clutch will drag and make finding neutral with the engine running impossible to find.

To drain the transmission, there is a small plug on the bottom side of the chrome cover on the right side of the transmission. Remove the plug, drain the tranny, and refill through the large plug that takes a hex key in the chrome cover. 20-24 ounces of transmission lube.

Good Luck

Apr 01, 2010 | 2005 Harley Davidson FLSTC - FLSTCI...

1 Answer

How to change transfer case oil

I assume that by the term "transfer case", you're talking about the primary drive and transmission on your Sportster. The lubricant that you pour into the primary case also lubes the transmission. Not so on a Big Twin as they each have their own lubricants.

On the Sporty, theres a drain plug on the bottom of the primary case near the rear end of it. I'm pretty sure it uses a Torx driver to remove it. Drain the oil and refill with H-D primary & trans lube for Sportsters. Remove the derby cover at the rear of the primary cover and fill the primary until the oil level is even with the clutch pressure spring with the bike standing straight up. Replace the derby cover.

Dec 14, 2009 | 2004 Harley Davidson XL 1200 C Sportster...

4 Answers

Changing fluids

Trans plug is under the Primary cover ( Left side ) and the Oil line is under the frame on the left side. Look for a oil line with a plug attatched to it. Run the bike up to operating temp. Primary and trans are the same thing ( Sport Trans fluid ) 1Qt in the primary ( fill throught the little cover on the side of the primary, and fill the oil through the oil tank. Put a little oil in the filter too, before installing, this will give the motor a little bit of oil until the rest of it makes it way through. You'll also need 1 p/n 11105 for the drain plug on the primary.

I’m happy to assist further over the phone at

May 02, 2009 | Harley Davidson Harley-Davidson Motorcycle...

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