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Transmission brake 8070pd fwd
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Sam T-Ga View Drop Down
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Joined: 13 Sep 2009
Location: Monticello, Ga.
Points: 392 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Sam T-Ga Quote  Post ReplyReply Direct Link To This Post Topic: Transmission brake 8070pd fwd
    Posted: 27 Apr 2017 at 3:29pm
I have customer with 8070 PD Fwd that the trans brake is not working. I have checked pressure at 200 psi. I am thinking I changed one in a 70XX one time without splitting tranny from rearend, went through bottom plate under gerotor pump or removed pumps and went through that hole. Any one else ever done this?
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MACK View Drop Down
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Joined: 17 Nov 2009
Points: 7664 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MACK Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2017 at 4:38pm
Have never saw a transmission brake worn out, but it can be changed through bottom plate if you want a oil bath.
 Would rather think he has other problems than worn out brake. Sounds more like warped pates in PD. 200 psi won't stop PD if plates are warped very bad.    MACK
 
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Sam T-Ga View Drop Down
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Joined: 13 Sep 2009
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Points: 392 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Sam T-Ga Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2017 at 8:16pm
It doesn't creep when in gear and you stop, so I don't think clutch plates are wrapped. I've seen others with wrapped plates and it doesn't act like that. If I get tranny stopped you can shift but if you let out on clutch with tranny in neutral then push in clutch, brake won't stop tranny. Trouble shoot guide in service manual list one problem could be dowel pin that holds piston from turning could be sheared and letting piston rotate, then brake is not every effective. That is sort of want it acts like to me. If you crank engine with tranny in gear and hold clutch in brake mode then you can shift from one gear to another. I guess I will drain oil and remove bottom plate and go after it. I would rather do that than split tractor.
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Lynn Marshall View Drop Down
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Joined: 13 Sep 2009
Location: Dana, Iowa
Points: 2427 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Lynn Marshall Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2017 at 8:46pm
I've done a couple of those over the years. One was a 7060 that I think was actually in a service recall. I remember that bulletin saying that certain tractors could shear the piston pin and cause poor transmission brake engagement. It's a long reach up in there and a lot is by feel alone but it can be done.  That little brake disc can certainly wear out if the operator presses completely down on the clutch pedal with a heavy load behind repeatedly.
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joe View Drop Down
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Joined: 30 Nov 2009
Location: SW Ontario
Points: 167 		Post Options Post Options   Thanks (0) Thanks(0)   Quote joe Quote  Post ReplyReply Direct Link To This Post Posted: 27 Apr 2017 at 9:19pm
While were on this topic, I was under the impression that the transmission brake was simply engaging several elements at once to cause the tranny to lockup. Or is that only the case for the Power Shifts(7020)? I would have thought they would have engaged low and high together to lock it up.
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MACK View Drop Down
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Joined: 17 Nov 2009
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Ps only uses two clutch packs at a lower pressure for brake.    MACK
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