AC 8050 PD hard shift

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   Good day, hope you guys can help me. My dad bought an 8050 with the PD transmission, he bought it knowing the reverse gear did not work. The tractor was shipped to his shop where my brother and I pulled the transmission top plate and found the reverse gear, idler reverse gear and 5th gear were damaged. We removed the cab, split the the tractor between the engine and transmission. We removed the transmission and I rebuilt it. I also disassembled the PD to inspect for damage but found none. We put everything back together, everything works good except when selecting a gear it’s grinds a bit. When I try to pull it out of gear it’s hard, almost like the clutch isn’t fully disengaging. I checked the clutch linkage adjustments according to the service manual and also the transmission brake pressure which are both ok. I have yet to check low and high clutch pressures. Any ideas? Thanks for the info

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mechanicmarty Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 13 Apr 2019 Location: Manitoba Canada Points: 11	Post Options Post Reply Quote mechanicmarty Report Post Thanks(0) Quote Reply Topic: AC 8050 PD hard shift Posted: 13 Apr 2019 at 10:28pm
	Good day, hope you guys can help me. My dad bought an 8050 with the PD transmission, he bought it knowing the reverse gear did not work. The tractor was shipped to his shop where my brother and I pulled the transmission top plate and found the reverse gear, idler reverse gear and 5th gear were damaged. We removed the cab, split the the tractor between the engine and transmission. We removed the transmission and I rebuilt it. I also disassembled the PD to inspect for damage but found none. We put everything back together, everything works good except when selecting a gear it’s grinds a bit. When I try to pull it out of gear it’s hard, almost like the clutch isn’t fully disengaging. I checked the clutch linkage adjustments according to the service manual and also the transmission brake pressure which are both ok. I have yet to check low and high clutch pressures. Any ideas? Thanks for the info

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MACK Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 17 Nov 2009 Points: 7664	Post Options Post Reply Quote MACK Report Post Thanks(0) Quote Reply Posted: 14 Apr 2019 at 8:15am
	Let up a little on clutch pedal to get out of brake poisons will help shifting. Give a little time for gears to stop turning before shifting into gear. MACK

mechanicmarty Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 13 Apr 2019 Location: Manitoba Canada Points: 11	Post Options Post Reply Quote mechanicmarty Report Post Thanks(0) Quote Reply Posted: 14 Apr 2019 at 9:45am
	Thanks for the info MACK, I tried driving the tractor this morning the way you suggested. It doesn’t seem to matter how long I wait for the transmission to slow down, it still grinds when put in gear. I have to shut the tractor off to get out of gear. Also when in the low range and lower gears the tractor creeps ahead unless I hit the brakes. I’ve got hoses coming in tomorrow to hookup to the test ports for the power director low and high oil pressure to see if there is still pressure when I push the clutch. The service manual suggested this symptom could be caused by: clutch linkage adjustments Warped clutch disks Plugged drain orifice on high clutch housing. I’ll test it tomorrow or Tuesday and post the results.

Lynn Marshall Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 13 Sep 2009 Location: Dana, Iowa Points: 2416	Post Options Post Reply Quote Lynn Marshall Report Post Thanks(0) Quote Reply Posted: 14 Apr 2019 at 10:56am
	It's very easy for a clutch disc to get out of place when reassembling the power director. This would act the way you are describing.

mechanicmarty Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 13 Apr 2019 Location: Manitoba Canada Points: 11	Post Options Post Reply Quote mechanicmarty Report Post Thanks(0) Quote Reply Posted: 14 Apr 2019 at 11:55am
	I’ll check the pressures first for piece of mind, if they are good then I’ll split the tractor and pull out the power director. Thanks for the info

DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 22080	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 14 Apr 2019 at 11:59am
	Removing the sump cover under the clutch would allow you to give it a visual to see if the spacing is equal between all the discs/plates before a split.

mechanicmarty Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 13 Apr 2019 Location: Manitoba Canada Points: 11	Post Options Post Reply Quote mechanicmarty Report Post Thanks(0) Quote Reply Posted: 14 Apr 2019 at 12:11pm
	That’s awesome! From what I can see in the parts description the high clutch orifice is also accessible from the sump cover. The reason I’m hell bent on the clutches still having oil pressure when the clutch pedal is pushed is because the damage done to the reverse gears we replaced looks like they kept grinding when shifted. Thanks

mechanicmarty Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 13 Apr 2019 Location: Manitoba Canada Points: 11	Post Options Post Reply Quote mechanicmarty Report Post Thanks(0) Quote Reply Posted: 23 Apr 2019 at 4:19pm
	Thank you MACK, Lynn Marshall and Dr Allis, for your info. I test low clutch pressures and found it went to 0psi when the clutch pedal is pressed. I readjusted the clutch linkage and took it for a test drive. It drives much better, the gear shift cable needs to be replaced. But other than that it shifts fine when the clutch is used properly. Thanks again for the info.

DougG Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 20 Sep 2009 Location: Mo Points: 8367	Post Options Post Reply Quote DougG Report Post Thanks(0) Quote Reply Posted: 23 Apr 2019 at 6:31pm
	Glad you got it figured out , you seem very mechanical inclined! Good work!