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http://www.discounttractors.net/downloads/front_end_loader_manual.pdf

Check that a bypass valve has not been open or that a rate of descent valve has not been completely closed.
I had that happen to me once. is there a know betweeen you legs under the seat? Try to open that if it is. Someone might have closed it all the way.
Is the system whistling when its running? Maybe a hose is hooked up backwards and the system is in relief dumping all the pressure to the sump.

Foton 45 3PH will not lift
Parts and Repair
Replies 15 Post by offgridman

IF your metal building supplier does not have them. Try Heritage Metal building co. They have provided windows and doors to me for some of my buildings.

http://www.heritagebuildings.com/

They are really easy to install using self tapping screws and caulking.

Windows for an existing metal building
Barns Pole Barns
Replies 9 Post by offgridman

Check the manual to see if it has a spring loaded oil pressure relief in the block.
Sometimes they lift when a tractor is started up with thick oil(cool oil) and don't reseat completely causing oil pressure to be low. They usually have a plug you can remove and you will find a spring and a plunger. Springs get week and plunger holes some times need a little cleaning.
Easy and cheap to fix if this is the issue.
Tractor engine diagrams usually show them.

Also dropping the pan and using a borescope check for trash on the oil pick up tube screen. That can do the same thing.

Checking oil pressure with a manual gauge will confirm if pressure is actually low or sending unit is bad.

How many hours are on engine?
Worn out engines can have loose bearings causing oil pressure to drop when it gets thin.

What weight oil are you using? It could be wrong weight oil ditto can cause oil pressure to drop.

Last thing to do is using heavy weight oil. Not recommended unless engine is high time and as a last resort.

393 Massey Ferguson dash light
Parts and Repair
Replies 12 Post by offgridman

[QUOTE=offgridman;165833] I have installed a new pressure switch and the oil light still stays on. Any ideas appreciated. offgridman at cs.comBatttery cable fell off while the ... [/QUOTE]

OK it took five years for me to solve this problem. It's amazingly simple.
Original problem was oil pressure light stopped working.
Then after I replaced the oil pressure sending unit (twice) the oil pressure light stayed on all the time.

The answer is.... When I replaced the original oil pressure switch during trouble shooting I had removed the parking light bulb and the oil pressure bulb switching them so I could test that the bulb was good.
Here is the kicker when I reinstalled the bulb holders I inadvertently switched the parking light and the oil pressure light positions. Since the parking light was set the oil pressure light stayed on... Duh.
The parking light bulb in the oil pressure switch burned out pretty quickly due to the switch being damaged while I was working on the fenders shortly afterward I had the oil pressure problem. Most likely because It was crushed by tall brush most likely and damaged. . I never noticed that the parking light (really the oil pressure light) came on every time I parked it since I always set the brake.
I decided yesterday to find the problem since I finally had time yesterday to find it.
I stopped my tractor after bush hogging and found that I had developed a tiny pin hole leak in the phram oil filter. I was luck enough that it had just happened and was still showing full on the dip stick.
This prompted me to take another look.
A simple reversal of the lights in the holes and a broken brake light switch about the same time caused me to think it was broken beyond the oil pressure switch.

OIl light stays on after battery cable came off while runniing JD 870
John Deere Tractors
Replies 11 Post by offgridman