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post #1 of 11 Old 09-17-2019, 10:22 AM Thread Starter
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322 Overheating/Oil Pressure Issue

Hi all. First post here!

I have a 322 with 940 hours on the clock. My father bought it new and has provided us with many years of trouble free service.

However I have run into two issues.

Earlier in the month the oil pressure light came on. A gauge verified 45 psi at idle and 62 at WOT. After research, an issue in the harness seemed likely. The sensor had been replaced about 10 years ago for the same issue.

I should add that when I pulled the wire off the sensor, the oil light remained on but the battery light was no longer lit up on the dash.

While mowing this weekend, the tractor proceeded to spew coolant out of the radiator cap. I am guessing this was due to me not tightening it. However the tractor temp light did not come on until tractor was shut down and fired back up again. I topped the coolant off and once the light was out continued to mow for another 10 minutes before parking the tractor. I noticed the engine was noticeably hot (no temp light) but as soon as I restarted the tractor temp light was on.

My thoughts are as follows, something in the wiring harness for the dash must be an issue. Also there is a separate issue in the cooling system. Possible thermostat or water pump I am guessing. I know the tractor has always had the ability to run hot but not like it had this past weekend.

After research on this sight, it seems overheating and oil pressure lights are very common problems with this tractor.

If anyone could provide any insight on where to begin that would be much appreciated!

Thank you,

Drake
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post #2 of 11 Old 09-17-2019, 01:00 PM
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Re: 322 Overheating/Oil Pressure Issue

The oil pressure light should be simple enough to troubleshoot. First of all, has any wiring been modified on this tractor? If not, the oil pressure warning circuit is simple enough. I can't upload your schematic right now, but the oil pressure warning lamp receives key-switched V+ power via circuit 515 (yellow wire). The other side of the lamp is connected to the oil pressure switch via circuit 620 (tan wire) which, when closed, will provide a path to ground through the body of the switch itself via the engine block therefore illuminating the lamp. If the lamp is illuminating even with the wire to the switch disconnected, you have a short to ground in circuit 620.

The battery discharge warning lamp should not be affected by disconnecting the lead to the oil pressure switch. That is strange and will require further troubleshooting, however let's look at the temperature warning first.

First of all, when you say the temperature warning came on when restarting the tractor, did it come on and stay on or did you just see it briefly while cranking? The temperature warning lamp should be illuminated with the key in the start position, this is a lamp test feature to prove that the bulb works. If it stayed on after starting, either the temperature switch is faulty or the engine coolant actually was hot.

Do you have an IR thermometer available?
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post #3 of 11 Old 09-17-2019, 01:05 PM
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Re: 322 Overheating/Oil Pressure Issue

Drake, As far as overheating, make sure the belly screen, the 3 vents on the pedestal, and the screen behind the radiator are clean. If you have an air compressor, blow the radiator from the engine side. If no compressor, a garden hose will do the same...WHEN THE ENGINE IS COOL !!! If garden hose, try not to get wiring wet!

Another possibility is the thermostat...which you can check. First, get a new gasket/0-ring from JD dealer, T32587, and a thermometer...infrared available at Harbor Freight for about $25. Remove thermostat and place in a pot of water. Heat water and monitor temperature and thermostat. At 160ļF, thermostat should start to open. At 184ļF, it should be fully open. Could also be a loose fan belt...check for tight...or a bad water pump or a partially clogged radiator.

Oil pressure light. Based on your findings, it's NOT an oil pressure problem. Also, if you removed the wire from the sensor and the light stayed on, it's NOT a sensor problem. You have power to the light when the key is "On". The light needs to be connected to ground to illuminate...this is done through the sensor. If light is on when wire is off the sensor, you've got a short in the wire or a bad ignition switch...possibly a bad diode, not sure.

Due you have TM1591? Schematics there will be helpful...as well as other info.

One last comment: A single wire from the ignition switch will turn on the oil pressure light and the coolant temp light. You may have a bad ignition switch! If original, I'd start by replacing that and see where things go from there. Bob
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post #4 of 11 Old 09-17-2019, 01:17 PM
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Re: 322 Overheating/Oil Pressure Issue

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Originally Posted by rwmeyer View Post
...or a bad ignition switch...possibly a bad diode, not sure.

One last comment: A single wire from the ignition switch will turn on the oil pressure light and the coolant temp light. You may have a bad ignition switch! If original, I'd start by replacing that and see where things go from there. Bob
No diode on the oil light circuit, and the prove-out circuit (the ground wire you refer to, from the ignition switch) is not connected to the oil light circuit either, so a bad ignition switch can only prevent the oil light from operating, not force it on.

The prove-out circuit DOES turn on the temperature light though, so it's possible he does need a new ignition switch in regards to the temperature light. Good catch.
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post #5 of 11 Old 09-17-2019, 01:32 PM
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Re: 322 Overheating/Oil Pressure Issue

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post #6 of 11 Old 09-17-2019, 02:49 PM
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Re: 322 Overheating/Oil Pressure Issue

Looking at the schematic I have and the schematic that Dixie posted, follow 333 org/wht back to diode & switch! This wire DOES turn temp & oil light on. Could be a simple short (from insulation breaking down) or bad ignition switch. Bob
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post #7 of 11 Old 09-17-2019, 03:46 PM
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Re: 322 Overheating/Oil Pressure Issue

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Originally Posted by rwmeyer View Post
Looking at the schematic I have and the schematic that Dixie posted, follow 333 org/wht back to diode & switch! This wire DOES turn temp & oil light on. Could be a simple short (from insulation breaking down) or bad ignition switch. Bob
How do you reckon? Circuit 333 provides ground to the engine coolant temperature lamp only. There are no paths to ground from the engine oil pressure lamp except that provided by circuit 620, which connects only to the oil pressure switch.

The oil light should come on with the key on and engine stopped, but it only does so because the oil pressure switch is closed until oil pressure rises enough to open it.
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post #8 of 11 Old 09-17-2019, 10:46 PM Thread Starter
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Dixie460 and rwmeyer thank you for the help as well as the schematic!

The tractor wiring is original and we do keep a pretty job of keeping the radiator, side screens, and belly pan clean. I should add that the tractor was in town mowing a fairly level lot and not out at the farm where it usually lives.

As far as the temperature light. It was not on when coolant blew out the neck of the radiator. But once I shut it down and fired the engine back up it was on. After topping off coolant with the engine running, the light shut off. I mowed for about 10 more minutes and then once I shut it off and fired it back up the light was on. So I left it sit in the shade for about two hours.

I’m going to pull in the garage tomorrow and pull apart the wiring as well as test the thermostat. And also check belts and water pump for leaks.

But I will add that thing has been a workhorse all of its life. And have nothing but good to stay about, this is the first time it has ever given us any real problems.

My biggest worry was that due to overheating (at least I think it was) it without knowing, it blew a head gasket but the oil is still clean which has me relieved.
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post #9 of 11 Old 09-17-2019, 10:58 PM
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Re: 322 Overheating/Oil Pressure Issue

For the overheating I would say flush the system, verify that the water pump is moving water properly since you said screens were clean.

I'm seeing in the manual that oil pressure is 53 psi plus or minus 10 so not sure you have an oil pressure problem. Like others have said, issue with wire or sensor probably.

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post #10 of 11 Old 09-18-2019, 08:05 AM
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Re: 322 Overheating/Oil Pressure Issue

I retrofitted a temperature gauge onto my 430 diesel. It was a bit of pain to do, but well worth it.
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post #11 of 11 Old 09-19-2019, 10:41 AM
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Re: 322 Overheating/Oil Pressure Issue

Consider that there is heat soak immediately after the engine is shut off. That is, the coolant stops circulating, and the engine metal parts are still hot. Thus, the overall heat rises for a minute or two immediately after shut off. In the "old days" cars could develop "vapor lock" in the fuel lines or carb bowls due to this short quick rise in heat after shut off. Had to wait a time to naturally cool to restart.

Not saying you might not have a cooling issue but your hot lamp coming on after shut down, when turning the key back on doesn't seem to be a surprise. But its worth it to check out everything, components have to be clean and functioning to avoid potential damage to your engine.

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