Posted by the tractor vet on January 24, 2023 at 16:21:58 from (108.220.145.239):
In Reply to: 806 T/A and PTO Issues posted by Woody7902 on January 24, 2023 at 04:05:46:
Ok so i am here So where do we start , Putting a stupid clutch in a 806 could be done by a second day ag mechanic in school , it's NOT rocket science . The way i explain it is the easy way for a DIY job . Doing the clutch adjustment and the trans brake is simple , The Dump valve here well as long as the dash tel tale lite works and ya backed off the adjusting bolt six seven full turns OFF then have someone hold the clutch down at a ideal and start to turn the adjust bolt in SLOWLY till the tel tale light JUST GOES OFF then let the clutch up then ADD one more full turn and lock the bolt down with the jam nut . That is DONE Now on the M C V valve ya got the up and down Spool valve this is what does the changing from Direct drive to the under drive or low T/A . This valve MUST BE ALL THE WAY DOWN to the snap ring for HIGH and all the way UP for low .NOW IF and again i said IF the low side is headed SOUTH and your just rolling along and pull the lever back for low and you don't feel anything this could mean she is just free wheeling . This is NOT good , Now IF you load the tractor with the brakes slightly then you SHOULD FEEL the DOWN SHIFT and the Sprag should lock up and drive the tractor . NOW just setting here behind the Key board and NOT with the tractor in question we are Guesstamating . Now as to the PTO here there is NO way anything you did at the clutch will cause it to not stop , the clutch brake for the PTo is Inside the PTO and is applied by spring force , when you go to engauge the PTO as you lift the control lever the hyd. pressure starts to come up and around 30-40 PSI it starts to pull the PTO brake pistons off over coming the spring pressure and applying the lock up pressure to the clutch pa. The test plug as stated below needs the test tool adapter that is made to fit a J I C fitting . Ya use to be able to BUY one from Case I H , then it was up to you to get a small Hyd line made up about 3-4 feet long and add a liquid filled gauge good to 600 PSI . I personally set them at around 245-255 PSI on and 806 , higher Hp tractors we go a wee bit higher . This valve like stated Below comes out the bottom , BUT like the spool valve on the T/A it has to be all the way down to be OFF and as far up as the linkage will allow . BUT to raise the pressure here you screw that valve stem up into the square block to raies pressure . BUT don't get the hair brain idea to just start twisten it up in more WITH OUT a gauge hooked up . One can make a test fitting by buying another test port plug and drilling a .o56-.060 hole thru the center of it then welding on a 1/8 th inch union then adding a Hose to that then add your 600 PSI gauge . If your going to dabble in barn yard repair then ya need two Hyd. test gauges , ya need the 600 Psi gauge and ya need a 5000 Psi gauge with a hose rated for above 5000 PSI . So here are my thoughts on the PTO (1) you have burnt warped clutches on the drive clutch pac. and you will need to drain the read end and remove the PTo unit and get it up on the bench . When removing this unit first off it is heavy the use of a cherry picker and a four foot chain is advised , as you start to pull back you MUST tip the back end down so not to hit the suction tube as you come back and out , this can be damaged Vary easely , once out remove the two 1/4 inch bolts holding the tube clam and remove the tube , then go ahead and throw it up on the bench and remove the 9/16th bolts there are four and remover the Hyd Pump and now your at the clutch pac . Pop the snap ring out and start removing and inspecting the clutches and plates keeping them in order . If the clutch pac is toast then i always in stall the 7 and 9 set or HD set . Now to go deeper into the PTO unit here is where ya need the service tool to remove the snap ring and the HEAVY return spring , Do NOT just go and pop off the snap ring , it will EAT you and ya got a couple more snap rings to come off to get to the brake pistons . BUT before you get all excited just make sure the PTo valve is going all the way to seat.
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