Ferguson recommend that you do not attempt to adjust these Safety Valves, just replace them if you have a problem. It is unusual for the Safety Valve to give trouble, it is more likely to be the Check Valve that is on the light spring attached to the Safety Valve and it can show wear on the seat. This is operating all the time the Pump is running while the Safety Valve is not. The Safety Valve will only wear if it is being discharged continually, if you are using a 3 point mounted implement that is not restricted from lifting fully then the Safety Valve will not be operating as there is no excess pressure. Make sure that the check chains are not tight when the implement is fully raised or the Valve will blow.If, as you suspect, that there was something under the seat of the Safety Valve this will have come out of the oil which should be changed to reduce th chance of it happening again..John(UK)...email@example.com
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