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4430 oil pressure

D

dkr

Member
My friend has a 4430 that has good oil pressure when it first starts up, but, goes down really low when it gets hot. He has to keep the rpms at about 1000 just to keep the gauge out of the red. He's running 15/40 oil with some lucas additive. I checked the archives to see if anyone had ever posted this problem, but didn't find anything. Could the gauge or sender be the problem. Is it valid to replace the oil pump to see if that fixes it before going into the main bearings. Thanks for any help. Dan
 
You should check the oil pressure with a good gauge first, you can unscrew the sender and screw one in there, I use a grease gun hose and a gauge from the auto store for a test set. If it still read low you probably have worn bearings,, wonder how many hours are on it...
 
First thing is, use a good mechanical gauge to see if the electronic gauge and sender are accurate. The gauge and or sender may be the only problem. If the mechanical verify bad pressure then seek more advice.
 
Thanks, Larry & Tim. I'll test it the way Tim said then go from there. It has 7900 hrs. on it. I would guess there has been no overhaul during that time. It doesn't smoke or burn oil but does have some blow by. Thanks again.
 
Tim the bearing life is not really based on # of hours but on start stop cycles. A forty year old tractor that only has 8000 hours probably has whole bunch of start stop cycles.my 4430 with 6000 hours would not hold oil pressure hot at idle either. also original main were fully gooved ( meaning upper and lower shells were grooved)and replacements are groved on upper only. Yep new bearings kinda helped .Paul
 
If the gauge reads good pressure when cold, Why would you think the gauge would be bad when hot? Engine has loose bearings.
 
Teddy, I've seen a lot of gauges & some senders become unstable, electrically as the tractor warms and voltages change. I have "fixed" many "loose" bearings by doing the proper testing of the gauges and then replacement of bad gauges. To believe the bearings are bad without verifying the pressure first is foolhardy.
 
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