First have you relocated the ground(-) cable from the rusty battery box to the engine block or starter mounting bolt?????? Besides adding/using SC valve you can rapidly move steering wheel from side to side while attempting to start engine to relieve hyd pressure.To give the correct destroking screw part numbers will require you to determine which hyd pump your tractor has. Here is one "example" of pump HYDRAULIC PUMP STROKE CONTROL VALVE
39 CM3 (2.4 IN.3)
A4365R PACKING "O" RING View/Update 0.82 US
R26448 O-RING, O-RING View/Update 1.46 USD
R27171 SCREW View/Update 7.37 USD
R27475 BUSHING,ADJUSTING SCREW 5.28 USD
34H254 PIN, SPRING View/Update 0.33 USD
Parts that have an issue will display a flag. *Subtotal 15.26 USD
This post was edited by Tx Jim at 15:36:41 05/08/13.
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