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656 lost hydraulics suddenly

F

fixerupper

Well-known Member
My neighbor has a 656 gas high utility loader tractor that suddenly made a grinding sound, similar to the sound the starter makes when it's dragging against the flywheel, and lost it's hydraulics. He quickly drove it to his shop with it grinding and when he got it in the shop the engine died and wouldn't restart. He said it cranks but won't start.

He called me for a diagnosis and I told him I don't know enough about 656 hydraulics to tell him anything, but the loss of hydraulics and engine dying sound like two different things happening at once. Can any of you IH guys figure this out? Jim
 
I think you are right that there are two different problems. The hydraulic problem is most likely the spline worn out in the pressure plate so it no longer drives the IPTO gear. When you get it running check to see it the PTO still works.
 

I might run over there tomorrow to have a look. I told him he could engage the PTO without the engine running and try turning the PTO shaft with a pipe wrench. If it turns easy the Splines are probably shot. Is the PTO hydraulically engaged or manual on this tractor?
 
The 656 has a hydraulically engaged PTO like the larger tractors. You will need the engine running to check it. Using a pipe wrench will only tell you if the PTO brakes are working.

You can see the IPTO drive gear between the pressure plate and the release bearing if you remove the bottom cover and look up there. You should be able to see if the splines are chewed up.

I once drove a nail in between the worn out splines on a tractor to allow it it be driven a couple miles to the shop. Not a good solution but it did the job. Made it more difficult to split though. :lol:
 

Might try the nail trick if it is the splines. He has a Westendorf loader on it that needs to come off and it would be easier with working hydraulics. This about the handiest loader tractor I've ever been around.
 
Check the key on the pump gear. If we lose hydraulics on our 706 that is one of the first things we check. Have a couple of clean buckets on hand for the oil. Then strain through a old sheet and put back in (to save money) when done. The gear might of hung up on something causing the grind. Or worse thing I can think of is the pump itself went out.

My guess (just that guess) the coil went out for not starting or the more obvious the "oh no Gas gauge" (out of fuel) and he just made it home.
 

Thanks Corey. Good suggestion. Last time this tractor died and wouldn't start the coil wire hade come out of the distributor. Simple fix on that one. Could be the problem this time, I haven't looked at it yet. Jim
 
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