Obviously too much pressure and the usual cause of that is a seized Safety Valve or a Safety Valve that is set too high for your model (it should be 2500psi).If someone has fitted a Safety Valve from the later tractors it could be far too high and you only find out when this happens. If as you said you were lifting your weight on a carry-all and it did that,whoever was lifting the load was possibly using the wrong Lever (DRAFT), that would allow the system to go to constant pumping, but the Safety Valve should still blow and limit the pressure. If however they used the Position Control Lever and that happened the limit stop is not set correctly BUT the Safety Valve should still blow to prevent this. So from your description I would fit a new Safety Valve (just in case) and reset the Lever limit stops. While you have the Top Cover off you should also set the Control Lever linkage as it does wear. If you need the setting information for the Lever internal linkage, just email me and I will send it...John...email@example.com
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