HD4 stopped moving

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   I was afraid of that.  If an internal seal is blown that means a total teardown to access the transmission doesn't it ?

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rehoward Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 19 Oct 2022 Location: Everett, WA Points: 3	Post Options Post Reply Quote rehoward Report Post Thanks(0) Quote Reply Topic: HD4 stopped moving Posted: 19 Oct 2022 at 7:08pm
	I was afraid of that. If an internal seal is blown that means a total teardown to access the transmission doesn't it ?

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Daelric Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 22 Sep 2021 Location: Terrace BC Points: 70	Post Options Post Reply Quote Daelric Report Post Thanks(0) Quote Reply Posted: 19 Oct 2022 at 2:09pm
	This has happened a couple times to me with my HD4, and both times the cause was too little fluid in the torque converter/shuttle clutch. Check your fluid level. The manual says that the correct fluid is "Type A", which in the modern day is the red Dexron ATF. I still have a slow leak in mine so when I'm using my machine a lot, I have to constantly top up the fluid to prevent this from happening. I'm hoping to dive into the guts of my machine this winter to try to fix this leak... ATF is expensive!

CAL(KS) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 18 Sep 2009 Location: Chapman, KS Points: 3746	Post Options Post Reply Quote CAL(KS) Report Post Thanks(0) Quote Reply Posted: 19 Oct 2022 at 9:33am
	i have no experience with this model but if i recall it has a hydraulic pressure applied forward and reverse clutch pack. i would say you blew a seal since you lost movement and are losing oil. guessing the plug is just to keep animals and dust out.
	Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20 Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15

rehoward Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 19 Oct 2022 Location: Everett, WA Points: 3	Post Options Post Reply Quote rehoward Report Post Thanks(0) Quote Reply Posted: 19 Oct 2022 at 2:48am
	Hi, new guy here, I was operating my well used AC HD4 a few months ago and it began to move slower and slower and then finally stopped. The engine was running, all hydraulic controls were fine, it just stopped moving. I messed with shifting the gearbox and pulled the forward reverse lever back and forth and nothing solved the problem. So I shut it off and climbed down to see what I could. First thing I noticed was that clean oil was draining from the skid pan onto the ground. And then I saw a round hole in the transmission casing which was not plugged but was wide open. I found a wooden plug in the dirt which I assume was pounded into the hole at the factory. I think the plug blew out! So I started the engine and saw that oil was flinging out the open hole at a pretty good rate. What do you suppose let loose inside the case? It seems that the transmission case is getting pressurized somehow?