MD3060 wouldnt move when in gear??

[Clayton]

Perhaps someone might know. My bus has a MD3060 transmission and DT466E with air brakes. I started it, ran it for about 5 min. But then it would not move when I put it in gear. I fiddled with it for a while. And it still wouldn't go. I then grounded my emergency exist wires. And still nothing. Then after about another 5 min it went into gear and worked well..... Just to test, after, I disconnected the emergency door ground and it did not affect the bus...... I'm confused.

[cadillackid]

was your air pressure still pumping up as you tried to put it in gear or was the air pressure already above 90 PSI the first time you put it into gear?
-Christopher

[Clayton]

I didn't check the pressure, but I think the brakes released. The transmission felt as if it was still in neutral.

[Dapplecreek]

This is going to sound really stupid, but I killed a car once this way. Did you check the transmission fluid level? Apologies if this is a ridiculous question.

[2kool4skool]

If your rpms are too high it will not go into gear...(around 800-850 I believe)

[bigskypc50]

I would check your fluid level and tranny filter, how cold was it? I see you are in north of the border, Maybe the air brakes were partly frozen to the drums. I am newbie also, but that would be the 1st thing I would check.

[Clayton]

Thanks for the replies. The brakes were not holding it back. It was if it was still in neutral. And we are having warm temperatures recently. In fact the snow has melted off the roof of the bus. The transmission fluid is up but I do have a transmission leak where the wires enter the transmission. That's something I got to fix soon as well. Not sure if that could be related.... Oh and it was on slow idle.