Author	[Modern View]
John(UK) 09-14-2012 07:46:21 79.76.240.13 Report to Moderator	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)...fergusontractors@hotmail.com [Reply]   [No Email]
Dukir 09-14-2012 18:55:30 184.35.7.108 Report to Moderator	Re: TO30 Hyd Relief Valve in reply to John(UK), 09-14-2012 07:46:21   Thanks, John(UK). I did replace with a new valve but my concern is if the aftermarket internet valves are the quality of OEMs; they’re much less expensive. I know the oil in the valve was very clean and there was no foreign material holding it open. I also know it was not the check valve as there was relief valve frothing in testing and the bench test showed leaking at <100 psi. As mentioned, I suspect the valve stem was binding in the spring compression nut (probably from lack of activation) which resulted in the stem protruding .022” beyond the nut.   [Reply]  [No Email]
John(UK) 09-17-2012 07:47:36 79.76.254.227 Report to Moderator	Re: TO30 Hyd Relief Valve in reply to Dukir, 09-14-2012 18:55:30   Most of the Safety Valves that are fitted now are aftermarket parts and we get little or no problems from them, so really I don't think you need to be too worried about the quality. It would be a different story if the tractors were working now as they were intended to work. I know it is not as good as the genuine ones (neither is the price) from MF which you can still obtain and if you have any doubts about quality, that is the only way to go as they are manufactured to the same original spec. There would be no froth from a leaking check valve as it is simply a non-return valve and nothing else, any pressure in the system will hold it shut. The only external signs you would get if it is leaking is that the 3 point linkage would leak down when the Pump was not running and if you can't easily find a leak, you should replace the Check Valve/Safety Valve assy as it isn't readily seen to be leaking....John(UK)...fergusontractors@hotmail.com   [Reply]  [No Email]