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No, the clutch and brake hydraulic systems are not connected.
If you are loosing fluid, you should be able to tell if it is leaking from the master cylinder where you add fluid, or the slave cylinder on the transmission.
The trans lube is the same as the primary lube. As long as the primary fluid is touching the bottom of the clutch basket with the bike sitting upright, you are good. You will have to remove the clutch (derby) cover on the primary cover to check the oil level.
CHECK TRANSMISSION FLUID LEVEL.ALSO CHECK CONDITION OF THE TRANSMISSION FLUID.IF LOOK DARK SMELL BURNED YOU NEED A FLUID AND FILTER CHANGE.IF ALL HAS BEEN DONE POSSIBLE CAUSE FOR TRANSMISSION SLIPPING IS FORWARD CLUTCH HAS WORN OR BURNED CLUTCH PLATES DAMAGED PISTON OR SEALS.ROLLER CLUTCH HAS DAMAGED ROLLERS OR MISSING SPRING.TRANSMISSION OIL PUMP HAS A FAULTY STUCK PRESSURE REGULATOR.HAVE TRANSMISSION PUMP PRESSURE CHECKED.
The primary case is not marked. The book says that between 32 and 40 ounces of oil is to be used in the primary/transmission case. This oil lubricates both the primary chain and sprockets as well as all the gears in the transmission. The oil will not be visible inside the case. If it were, there would be too much oil and it would make the clutch "drag" making it impossible to find neutral with the engine running. The sprockets and chain are lubricated by a mist of oil generated by the starter ring gear on the outer clutch drum slinging the oil all in the primary case when the engine is running.
Some of the older Sportsters had a threaded hole with a screw in it towards the bottom of the forward end of the case. One would remove the screw and fill the primary until it started to run out of the hole.
CHECK TRANSMISSION FLUID LEVEL.MAKE SURE FLUID LEVEL NOT LOW.IF FLUID LEVEL OKAY BUT TRANSMISSION FLUID LOOK DARK HAS BURNT SMELL CHANGE TRANSMISSION FILTER + FLUID.IF FLUID AND FILTER HAS BEEN CHANGED YOU HAVE THE RIGHT AMOUNT FLUID IN TRANSMISSION AND MANUAL SHIFT LINKAGES PROPER ADJUSTED.CHECK TRANSMISSION FUSE AND SCAN FOR PRESSURE CONTROL SOLENOID VALVE MALFUNCTION FAULT.IF ALL IS GOOD HAVE TRANSMISSION OIL PUMP PRESSURE TEST.YOUR PUMP COULD BE FAULTY OR YOU HAVE WORN LOW ROLLER CLUTCH AND WORN FORWARD CLUTCH PLATES AND LEAKING FORWARD CLUTCH PISTON SEALS.
The lubricant in the primary is also the transmission lubricant. I've always used H-D primary transmission lubricant for Sportster. It takes one quart.
Check the hydraulic fluid to your clutch master cylinder. If it's low you may have a warn clutch or a leak in the system, and most likely at the clutch slave cylinder. Try adding more fluid if it's low and bleeding the system, at worst your going to need to replace the clutch. Also it would not hurt to check your transmission fluid or better yet service it to replace the oil transmission fluid with new fluid. You'll find the fill and drain bolt at the side of the transmission. Good luck and keep me posted, thank you for using Fixya.
Harley-Davidson Sport Trans fluid or equilivant. Now, there are several aftermarket makers of this oil. It is different from the oil used in the Big Twin clutch cover because in the Big Twin, the oil only lubricates the chain and the clutch. In a Sportster, the oil also is the transmission lubricant so it has to have the proper shear resistance and high pressure lubricant additives in it. Custom Chrome, V-Twin, Motor Factory, and many others make this lubricant. Order it through your motorcycle shop.
check the clutch slave cylinder while haveing someone step on the clutch to insure movement if there is little to zero movement then replace the clutch master cylinder and bleed it out ! also look to see if fluid drips from the slave cylinder? if it does? then replace that too! if all that checks out then/ remove the transmission and inspect! check/change the clutch pressure plate assembly
Old fluid or improper type. Doesn't the Sporty use the SportTrans fluid in the year? Other than that, maybe time for new clutch plates. Or the clutch spring may have lost it's spring.
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