Pump Safty Valve Plunger

BigYoung

Member
Well I cut a wrench to fit and removed the N's relief valve. New valve and old valve.
Looks like plunger is still in pump. Tried the wife's tweezers and not sure I ever grabbed the plunger shaft. Think I can feel it wobble/rotate with the dowel. Was able to stick orange belt checker all the way into chamber, but red tube bottemed out and I cut the tube to show depth to you guys.

Can I backfeed compressed air thru test port and blow out the plunger? I'm sure it is not in sump of pump.

Cut away pics and all comments apprieciated.
a191245.jpg
 
If it is in there on its seat, pressure applied to output (test port) would act to seat it harder.....so, wrong direction. You would be better off to remove one of the top plugs from the valve chambers and apply air there.
 
I believe plunger is stuck to seat as I can insert dowel and get plunger shaft to wobble in a circle - shaft must pivot while new valve's plunger is fixed to shaft. What about refilling sump with gear oil and operating lift with load... would that push the head off of the seat and into sump/magnet?

I'm a rookie and am hesitant to remove top plug from chamber with pump in tractor in tight quarters.
 
(quoted from post at 14:01:02 05/12/15) I believe plunger is stuck to seat as I can insert dowel and get plunger shaft to wobble in a circle - shaft must pivot while new valve's plunger is fixed to shaft. What about refilling sump with gear oil and operating lift with load... would that push the head off of the seat and into sump/magnet?

I'm a rookie and am hesitant to remove top plug from chamber with pump in tractor in tight quarters.
hould work. No need to completely fill. Just enough to have fluid above intake valve.
 
Just take the one off the new valve and put the new valve in on the old check valve.

I had the same problem with one a couple of years ago and that is what I did. Stiil working.

I have always wondered exactly what the function of that check valve is anyway?????

I have left one or two out just to see what happens and I can't see any change in the system with it out.

I think it is designed to prevent the oil from draining back when the system is shut down but the pump valves should do the same thing I would think>

Other opinions????

Zane
 
(quoted from post at 21:37:03 05/12/15) Just take the one off the new valve and put the new valve in on the old check valve.

I had the same problem with one a couple of years ago and that is what I did. Stiil working.

I have always wondered exactly what the function of that check valve is anyway?????

I have left one or two out just to see what happens and I can't see any change in the system with it out.

I think it is designed to prevent the oil from draining back when the system is shut down but the pump valves should do the same thing I would think>

Other opinions????

Zane
think about the same,Zane, when all is perfect. However, those four inlet valves see a lot of movement and their seating area is many times larger (potential leak area) than the tiny seat area of the check valve. So, I expect that over the useful life, the check will result in a better "hold up" (less leak down) that a system without one. Opinion of course, as you asked. :wink:
 

Thank you JMOR and Zane. I will try to install new valve on stuck plunger and if that doesn't come together, I will operate without valve hoping the plunger will be expelled into sump.
 
(quoted from post at 02:37:03 05/13/15) Just take the one off the new valve and put the new valve in on the old check valve.

I had the same problem with one a couple of years ago and that is what I did. Stiil working.

I have always wondered exactly what the function of that check valve is anyway?????

I have left one or two out just to see what happens and I can't see any change in the system with it out.

I think it is designed to prevent the oil from draining back when the system is shut down but the pump valves should do the same thing I would think>

Other opinions????

Zane

I was able to thread the new valve onto the old check valve completely, then tightened with wrench. Thanks for good advice Zane.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top