MF 50h transmission wont engage.

[racecarrice]

I just traded for a MF 50h backhoe and the transmission wont engage in forward or reverse. the man that had it said it would work sometimes but now i cant get it to work at all. Does anyone know where i could find out how or what to check? I am a mechanic but have never worked on a MF transmission before. It is supposed to be a 1987 model but im mot sure. It has the shifter on the steering column.

 

[Jim Kennedy]

Hi racecarrice. I recently bought a MF 50H Series S and I think 1987 model and have not had any problems with the transmission. I think you should start with the electrical system and it's components. Here is the curcuit drawing.I would be checking with a meter starting from No5 the Start Switch through to the directional solenoids and the two declutching switches and their appropriate relays and check fuse No6. Please note there is a PDF attachment which you will need to open, there are two pages in the PDF.

Jim

 

[racecarrice]

Thanks Jim I do believe it is in a switch or something and not a mechanical problem. I did check on one of the solenoids and had power with a test light but never checked to make sure of the voltage. I dont have it home yet so its hard to check after i get off work.

 

[d4c24a]

On the side dash where the rev counter, key etc are , there is an override button ,try this and see what happens ,if it works it could be one of the declutch buttons

 

[racecarrice]

I didnt see any button there. the only thing i seen was a red button that i thought was emergency flashers.

 

[d4c24a]

if you look on jim's attachment 96 emergency drive , sure it's a black button on the side

 

[racecarrice]

It is still at the guy that I got it from house so i will look for the black button when I go back to work on it but I'm pretty sure there is no button there but I hope it will be that simple. thanks.

 

[AussieChris]

On my 50HX the override button is a RED one. It is on the back side of the side console. It is supposed to by-pass all the safeties. Also, check your fuses.

Chris.

 

[d4c24a]

Its only for emergency use , not a fix but will tell if it is electrical

 

[racecarrice]

thanks i will try that mine has the red button on the back side.

 

[racecarrice]

Ok thanks guys I finally got it home. it was the steering cylinder leaking and lost all of the oil in the transmission. I had to drive it about three miles to get it home. It only made it about a half of a mile so i had to have the wife pull me the rest of the way with with our gmc envoy but at least its home now. I put oil back in and trans works fine. I plan a trip to the hydraulic shop this week to get the cylinder rebuilt.

 

[AussieChris]

Glad you got it sorted and thanks for the follow up post.

 

[racecarrice]

Okay I thought that I had it figured out when I posted last update but that wasn't it. I think that I finally got it figured out. I replaced the declutch solenoid and it has worked fine ever since. Now I just have to rebuild the main boom cylinder and I will be ready to start digging ditches. I have used the front loader about four hours and so far so good.