Posted by Owen Aaland on July 14, 2011 at 22:48:31 from (216.47.33.237):
In Reply to: 656 Hydro question posted by TimWafer on July 12, 2011 at 07:15:05:
On the left side of the center section of the tractor there are two 1/4" steel lines. Behind the rear one is a large pipe plug with a recessed square hole. remove that plug and the end cap for the shuttle valve is just inside. Remove the end cap carefully because if the snap ring is off or broken there will be some loose parts. Usually all it takes is to install a new snap ring and reassemble.
A more common complaint with the snap ring problem is that the tractor will not go backwards unless you first move the lever forwards or use the Foot-N-Inch valve. When it does go into reverse it does so with a jolt.
If the snap ring is not the problem then you need to isolate the hydro unit from the outside controls by disconnecting the two high pressure lines and cap them. If you do this be sure you have plenty of room around you because the Foot-N-Inch valve will no longer control the tractor. The only control will be the SR (Speed Ratio) lever. That test can determine in the problem is internal or in the outside controls.
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