YM1720D tractor still pulls in neutral

Marv · Feb 3, 2004

I have a YM1720D tractor that when I put the tractor in neutral it still wants to pull forward. I can hold it from moving by holding the wheel, but let the wheel go and it want's to move forward. I was told there was an O ring in the valve body that was bad, took it apart but no O ring to be found, What else can it be? any help would be appreciated

buppy69 · Feb 3, 2004

Could be just a linkage adjustment.

Eugene

normde2001 · Feb 3, 2004

Really Marv, as a dealer, you need to learn how to fix these things. /forums/images/graemlins/wink.gif Has the hy/tran fluid been changed and screen cleaned. Sounds like heavy fluid is trying to turn the tranny gears.

kayssupply · Feb 3, 2004

There is also a neutral brake linkage that can be adjusted on the clutch pedal side of the housing.

Marv · Feb 4, 2004

Yes I changed the trans fluid & cleaned the screen & it still does the same thing NOW WHAT!

Marv · Feb 4, 2004

Reed,
There is no neutral brake linkage that can be adjusted on the YM1720D clutch pedal side of the housing.

kayssupply · Feb 4, 2004

Sorry, the xx20 series tractors I have had were all larger. They all had it.

lens12 · Feb 4, 2004

It sounds like there is a leaking valve in the control valve assembly. It would probably be helpful to get a Yanmar service manual that would explain how the valve assembly works.

Egon · Feb 5, 2004

I am unfamiliar with your tractor but assume it has an Hst Transmision.

If so it the forward reverse control may not be centering properly. This has happened to my Kubota. It has an external setting to adjust this. Unfortunetly my problem lies deeper into the system and requires quite a bit of work to get to the part suspected to be causeing the problem. So far I am living with it due to economics.

Hope this may be of some help.

Egon