1401 PTO issue URGENT!! Need to fix!!!

[psient]

Hi:

I just got the rototiller hooked-up to my Yanmar 1401. I went to try it out on an area I had recently tilled. The ground was thoroughly broken up and friable. I put the tiller in the 540 speed and started moving forward in low-first at 2000 rpm engine speed. At first with very little depth the rototiller seemed to be doing fine. However, when I tried to set the depth below 2 inches there was a problem. To my surprise the tiller stopped turning accompanied by a grinding noise and severe vibration. I went through the other pto speeds and found similar results.

The tractor has a new clutch and all forward and reverse speeds work fine as does the 4wd. The tiller will work up to the point where the resistance takes over and bogs it down.

The noise sounds like the gear-grinding noise made by forcing a regular gear without clutching the transmission. The forward speed continues to work while the tiller/pto is stopped. If I raise the tiller to the point that the resistance lessens, it resumes working.

This seems to be a PTO issue yes? Can anyone help me figure out how to fix this?

Thanks,

Jon

 

[Ginormous]

Can you tell where the grinding noise is coming from? Is it coming from the tiller?

 

[Car Doc]

What does the pto shaft do when this grinding is going on does it stop slow down stay the same?

Can you get someone to watch the tines and listen at the same time that is the only way to figure if its the tiller or tractor.

 

[winston1]

Do you have an overrun clutch? If so make sure it is not faulty. If I am understanding correctly the pto shaft is not turning. Reason I say this is because it could be gears or sprockets in the tiller if the pto continues to turn. If the pto is not turning you have bad gears, bad bearings, stripped drive coupling. Only pulling the pto unit will make positive diagnosis. Can't find a drawing of a 1401 pto housing but here is one on a 1500. Yours might be similiar. #25 is the housing. Yanmar Tractor Parts: TRANMSISSION_CASE_G

 

[psient]

What does the pto shaft do when this grinding is going on does it stop slow down stay the same?

Can you get someone to watch the tines and listen at the same time that is the only way to figure if its the tiller or tractor.

It's coming from the tractor.

Jon

 

[psient]

What does the pto shaft do when this grinding is going on does it stop slow down stay the same?

Can you get someone to watch the tines and listen at the same time that is the only way to figure if its the tiller or tractor.

The pto shaft stops.

 

[psient]

Do you have an overrun clutch? If so make sure it is not faulty. If I am understanding correctly the pto shaft is not turning. Reason I say this is because it could be gears or sprockets in the tiller if the pto continues to turn. If the pto is not turning you have bad gears, bad bearings, stripped drive coupling. Only pulling the pto unit will make positive diagnosis. Can't find a drawing of a 1401 pto housing but here is one on a 1500. Yours might be similiar. #25 is the housing. Yanmar Tractor Parts: TRANMSISSION_CASE_G

IF the overrun would be an attachment then no there isn't one. From the tractor to the tiller there is nothing but direct shafting.

Can you pull the pto assembly without splitting the tractor?

Thanks,

Jon

 

[damammel]

If the pto is not turning you have bad gears, bad bearings, stripped drive coupling. Only pulling the pto unit will make positive diagnosis.

Winston1 is right on. To figure out what is happening, now knowing the PTO shaft stops turning, you need to pull the housing off. A new gasket is available from Hoye but it appears the other parts may not be.

 

[damammel]

You should be able to pull the housing off the back where the PTO comes out. This will likely only allow you to look at it but not remove it But looking at the drawings, I'm not sure you'll be able to see much. At this point though I'd say its worth a try.

 

[Ginormous]

Before tearing the tractor apart, I would make double dog sure that the PTO coupler coming out of the tractor (the spline shaft that attaches to the PTO shaft) is stopping. With the PTO guard, it may be impossible to see while operating the tractor. If the spline and end of the PTO shaft are slipping over one another at high loads, it would make a grinding noise and would probably seem to come from the tractor's PTO gearbox. Good luck!