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First , the clutch , pressure plate and release bearing are separate from and in front of the hydra drive . The hydra drive is a seperate unit which runs in automatic transmission fluid and bolts up to the the bell housing on the tractor .A seal keeps the automatic transmission fluid from leaving the hydradrive unit and getting to the drive clutch and pressure plate . The clutch , pressure plate and release bearing are "dry " . If you are getting either automatic transmission fluid or engine oil in the clutch area then you have a seal leaking somewhere . Basically the drive power on the tractor works as follows . The engine provides power to the flywheel . A clutch plate and pressure plate are bolted to the fly wheel . The release bearing sits in a yoke and is pushed in and activates the pressure plate when the clutch pedal is depressed . A drive shaft comes off the clutch plate and goes into the hydradrive unit . There are also wet clutches in the hydradrive unit and then there is a drive shaft out the back of the hydradrive unit which turns a sprocket to the transmission . Based on my 1850 , which I believe is the same as your 1650 , if the tractor has an old pressure relief bearing , there would have been a tube running from the bearing to outside of the bell housing and grease would be applied through this tube . If the tube is broken , lost or the release bearing was replaced at some point in time with a newer bearing , the only way to get to a grease fitting on the bearing (without removing the entire engine from the frame and disassembling the engine and bell housing etc) is to remove the metal plate on top of the bell housing and get to the grease fitting on the release bearing through this opening . A flashlight and a mirror might come in handy as well as a grease gun with a long hose . Once you take the plate off ( there should be four screws ) , the pressure release bearing for the clutch is foward of the hole in the bell housing toward the engine . There should be a set of forks which act as a yoke for the release bearing . Just follow the forks or yoke foward toward the engine to locate the release bearing and you should be able to turn it by hand to find the grease fitting if it has one . On the hydra drive , the unit runs in automatic tranmission fluid type A ( the red one ) . There is a drain plug on the bottom of the unit toward the back of the unit . The filter for the unit is pretty obvious on the right side . I try to change my fluid and filter once a year . Others may say that is too much or too little .
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