YM2000 Control Valve O’ring

[chadc5-HT]

Hello all,

Need some help/advice regarding my Yanmar YM2000 rear 3pt hydraulic lift system.

The O’ring between the Control Valve and the Cylinder Case keeps blowing (separating).

I bought the tractor with this issue (will not pick up a weighted load). Identified the blown O’ring and replaced with Hoye part per online schematic.

The tractor ran fine for a hour or so cutting grass; however, I stop to take a break and raised the rotary cutter up and the system lost pressure (implement lowered and would not lift again).

Removed the Control Valve and found the new O’ring blown (separated).

I was thinking about removing the Relief Valve on the side of the Cylinder Case for inspection.

I can’t seem to find any info on this subject. Any help would be much appreciated.

 

[Aaron-HT]

The only time I have ever heard of that was in the thread below. If you are already getting the correct o-ring then there must be something causing too much pressure or something wrong with that o-ring seat.
<LINK_TEXT text="http://ymowners.co...f=1&amp;t=9897&amp;p=36109#p36109</LINK_TEXT>

 

[chadc5-HT]

<QUOTE author="Aaron"><s>

</s>The only time I have ever heard of that was in the thread below. If you are already getting the correct o-ring then there must be something causing too much pressure or something wrong with that o-ring seat.
<LINK_TEXT text="http://ymowners.co...f=1&amp;t=9897&amp;p=36109#p36109</LINK_TEXT><e>

/e></QUOTE>

Thanks, Aaron.

I've got an extra O’ring and new gasket I ordered from you guys. I'm going to install it and try again.

The original Control Valve gasket is thicker than the one I received from you guys. Maybe the new (thinner) gasket will do the trick.

Thanks again!

 

[Aaron-HT]

<QUOTE><s>

</e></QUOTE>

Yes a thicker gasket would cause the o-ring gap to be larger and could cause the oring to blow out also.

 

[chadc5-HT]

<QUOTE author="Aaron"><s>

</s><QUOTE><s>

</e></QUOTE>

Yes a thicker gasket would cause the o-ring gap to be larger and could cause the oring to blow out also.<e>

/e></QUOTE>

Thanks, I appreciate your time and help.