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Good day to all! I did a search, but the site kept telling me no items on oil sending units. My Jinma 354 Four Cylinder (munufactured 08/2007) 267 hours on it. The oil pressure was showing “2” -“3″ on my electric factory dash guage at 750/ 800 rpm. I was doing digging a trench for a 24” drain pipe and using the backhoe when I noticed the oil pressure drop. I changed the oil and filter. Now it is going into the “RED” below “1” and moves slightly when put up to 2,000 rpms. I was thinking that it could be my sending unit. How can I check it or has anyone replaced their electric sending unit with after market or changed to non electric pressure guage. I don’t want to end up blowing my engine and need to get it fixed so I can use the tractor. I just did complete maintenance with changing all filters, hydraulic oils (tractor/Fel/Backhoe), compressor oil, engine oil, transmission gear oil, front axle gear oil, greased everything tractor, FEL & Backhoe. Also put new radiator hose & new antifreeze. Then cleaned/pressure washed everything. Now I am afraid to use it due to the oil pressure showing up low on the dash. Any Ideas???
Thanks
Len
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I would suggest getting a generic mechanical oil pressure gauge from any auto parts house and installing that. At least to confirm the function of the electronic gauge.
Do you also have a low oil pressure “idiot light”? If so is it on too?
If both indicators say low oil then it probably is low. But if they don’t agree with each other, it is probably the sending unit or the gauge in the dash.
Either way a mechanical gauge is probably cheaper then chasing parts without knowing for sure which one is bad.
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No “Idiot” light that I know of. I will have to see what size threads are on the exsisting electrical sending unit to change to a mechnical. I also been going through about a thousand posts on the CTOA and there is a mention of a “Pressure Releife Valve” in the filter head being stuck open. Don’t know what that is.
Thanks much
Len
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The fittings on my 284 with a Y385T engine were surprisingly 1/4″ NPT. Hope yours are too.
The valve in the oil filter is likely referring to the bypass valve that lets the engine get unfiltered oil should the filter become plugged. I wouldn’t dump oil back to the sump and cause no pressure. A plugged filter could cause low pressure though.
When you turn on the key switch but before you crank the engine, look to see if there is a light on the dash that comes on. The ones I have seen had a light for the alternator and one for the oil pressure in addition to the gauges. Mine has both and One time I got the wires mixed up between the sender and the switch for the light. Boy did that show some goofy readings until I figured it out!
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Already checked for “Idiot” light. My 354, when you turn on the key has “Battery” and “ON” red lights only. New oil filter and oil. My sending unit looks like 3/8″, but have to take off to see. I ordered a mechnical guage kit. Hopefully there will be NPT threads on mine. If I took off the sending unit and cranked the engine oil with out starting -should shoot out of the hole? At least I would know the pump was working. Then connect the guage to see if pressure builds up. I do get pressure when I star it up then it goes low and when i rev up to 2k the needle moves so I know there is oil circulation, just don’t know how much if the guage is faulty. I was going to chage out 10 years ago, but wasn’t a priority at the time. I also need rubber shifting boots for Hi-Lo Range Shifter and Gear Shifter. Trying to find aftermarket 0nes. These Jinma Chinese rubber anything disinagrates after a year or two,
Been using my tractor for helping out my neighbors and wearing it out probably 30% my property.to 70% free work. I am fixing it up now and wil stayin my yard. Never got a dime or reciperal help with my work for all the work I gave out. Some people just thjink you have a tractor, FEL, and backhoe and it runs on air and doesn’t cost anything to run. they especially don’t pay and don’t do any maintenance. Time to cut them off. My machine will be broke down foreve unless I have a project. I’ll let you know how the new guage works out.
Thanks much Len
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I agree about adding a mechanical gauge and keeping it on the tractor , I would think that it will be either 1/8 inch or 1/4 inch pipe. As for the oil pressure adjuster it is on the side of the oil filter housing and is covered by a acorn nut , I would not fool around with it until you verify your readings with the mech. gauge. I put one in that reads psi cause I am used to looking at that scale. To me the metric measurement is a bit vague.
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Hey David hope all is well in Sourhern, TN. I ordered a mechanical guage, probably have to get some extra fittings to adapt it. I just took of the sending unit and did a “Crank” on the engine for a split second and oil shot out about six feet. Must be a bad sending unit. Probablyplumb in a “T” and put a new electrical sending unit so I can see on the dash and instal the mechnical guage next to it.
Thanks much
Len
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