Last season my Ransomes T51D mower sprung a leak in one of the Pilot Operated Directional Valves for the 4WD. When the hydraulic oil got hot, it would leak quite an amount of oil out of the head of the pilot valve, where the 0 ring is located on the outer head. The pilot valve is screwed into an aluminium valve manifold to direct oil flow in different directions. The hydraulic units on these Ransomes mowers is made by Hydraforce.
I ordered a new Hydraforce PD10-30-0-N-110 Pilot Operated Directional Valve from http://www.hipower.ie in Dublin. The valve has a long order time just be warned and is pretty pricey at €153 inc shipping. But glad i could get the valve as the machine dates back to 1999.
After the pilot valve was replaced, no more leaking thankfully.
Link to valve details: https://www.hydraforce.com/products/val ... s/pd10-30/
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