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Old 10-25-2010, 07:01 AM   post #1 of 29
CHDinCT
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Default Oil Pressure Light Blinking

Anyone know where I can find the oil pressure safety switch on an Onan P220G? Was doing leaves yesterday and stopped to empty the Cyclone Rake. Went to start it and no go. The oil pressure warning light just blinks and it won't crank. It was running fine before that. Checked the oil level and it's fine though I did smell some oil earlier while mowing. Would a plugged crankcase breather trip the switch? That would cause too much pressure, but according to my manual, it leads to oil leaks at the seals and oil in the air cleaner, none of which I see. I hope it's just a safety switch issue. Thanks
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BX25, 54" MMM, 5' Rake, Wallenstein BX42 PTO Chipper, Woods Rear Blade, 54" front blade, 48" box blade, Ratchet Rake.
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1967 Wheel Horse 1077 with 36" RD deck (in resto).
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Old 10-25-2010, 04:03 PM   post #2 of 29
motox25
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Default Re: Oil Pressure Light Blinking

The pressure switch on the P220G is behind the flywheel shroud. You'll likely have to pull the flywheel to get a good look at it, its on the block near the rear cylinder.
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Old 10-25-2010, 05:47 PM   post #3 of 29
rscurtis
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Default Re: Oil Pressure Light Blinking

Is there a possibility that the engine is overheating and causing the oil to thin out, turning on the light?
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Old 10-25-2010, 06:29 PM   post #4 of 29
CHDinCT
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Default Re: Oil Pressure Light Blinking

I got as far as getting to the oil pressure switch today. I got the flywheel shroud loose but not all the way out, but I can see it now. I also took a look further at the crankcase breather and I did see some oil under the air cleaner when I took it out. Also some oil dripping out of the vacuum tube for the fuel pump, so maybe it is a bit clogged. Odd thing is that the crankcase breather on my P220 doesn't look like the one in the Onan manual I have. I'm going to try to get it out and clean it, hopefully tomorrow, and also check and clean the contacts for the oil pressure switch. Maybe it's just a bad ground.

Just for kicks, I looked up the cost of a new pressure sensor switch from Toro - $153.04

As far as overheating, I would think once it cooled off it would start up again. Seemed to be running fine until I turned it off to unload leaves.
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BX25, 54" MMM, 5' Rake, Wallenstein BX42 PTO Chipper, Woods Rear Blade, 54" front blade, 48" box blade, Ratchet Rake.
1993 Wheel Horse 520-H, 48" deck & vac bagger.
1967 Wheel Horse 1077 with 36" RD deck (in resto).
Cyclone Rake, and other toys, I mean tools
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Old 10-25-2010, 07:00 PM   post #5 of 29
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Default Re: Oil Pressure Light Blinking

Clean the breather (use mineral spirits) and then replace. That wire mesh will likely gunked up. Make sure that the air filter is clean too. Check the contacts for the oil pressure switch- may just need to clean it...
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Old 10-25-2010, 07:54 PM   post #6 of 29
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Default Re: Oil Pressure Light Blinking

Chris, neither the oil pressure or head temperature sensors are in series with the ignition on my 520s. The oil pressure switch either lights the light on low oil pressure or runs the hour meter on normal pressure. The head temperature just has a warning light. So, I don't think either would keep your engine from starting. You may want to check your wiring diagram. If it still isn't starting, I would try connecting a temporary wire from the positive side of the battery to the positive side of the coil to see if it starts and runs without all of the safety switches. Then you will know where to go next. LOI (Love Old Iron) was helping someone earlier with a blinking oil pressure light on the Red Square Wheel Horse forum. You may want to search on it, also.
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1967 857 (Restored in 85), 36" deck, front blade, plow
1977 C121-8 (Restored in 88) w/rebuilt 16 hp Kohler, 42" recycle deck, Tiller, Snow Blower and Cab, Plow, Front Blade, mounted Sprayer & Spreader
1979 C161 Auto (Restored in 10), 42" deck
1979 B7100D Kubota (Refreshed in 10), FEL, Snow Blower, Front Blade, Woods Mower, Tiller, Plow, Dirt Scoop
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1989 520-H, 48" deck
1990 520-H,48" deck
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Old 10-26-2010, 09:02 AM   post #7 of 29
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Default Re: Oil Pressure Light Blinking

You state it will not crank now. I take that to mean the starter will not turn or is not getting energized. I see nothing in the starter circuit that is tied to the oil pressure switch.
Perhaps to test the oil circuit/system, you can remove spark plugs (to ease compression) and jump the starter. Spin to see if pressure builds to extinguish light. You can place a test lamp on the hour meter - terminal. The hour meter begins clocking when oil pressure switch turns off the light (pressure present) and then completes the ground circuit for the hour meter.
I would guess you have no issues with the oil system. Rather typical 520 electrical bugaboos. Wiggle that silly nine pin Molex connector. That thing is a great source of aggravation!
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Old 10-26-2010, 10:43 AM   post #8 of 29
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Default Re: Oil Pressure Light Blinking

Well, I think I found the issue, but maybe not the cause. The 30 amp fuse was fried. My voltage regulator has been acting weird for a few years. When running, the voltmeter vacillates between 13+ volts and pegging all the way right (over voltage). Probably time for a new voltage regulator after 18 years of use. Could the run away voltage regulator have caused the fuse to fry? I don't want to do a simple replace and have it pop again.
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BX25, 54" MMM, 5' Rake, Wallenstein BX42 PTO Chipper, Woods Rear Blade, 54" front blade, 48" box blade, Ratchet Rake.
1993 Wheel Horse 520-H, 48" deck & vac bagger.
1967 Wheel Horse 1077 with 36" RD deck (in resto).
Cyclone Rake, and other toys, I mean tools
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Old 10-27-2010, 05:54 PM   post #9 of 29
motox25
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Default Re: Oil Pressure Light Blinking

I would definitely think so if it sends too high a voltage through the electrical system. However, a fuse is much cheaper than a new regulator so you could try a new one and see if it happens again.
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Old 10-27-2010, 07:17 PM   post #10 of 29
gwest_ca
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Default Re: Oil Pressure Light Blinking

High voltage won't blow a fuse. It is the amps or current flow exceeding 30amps that would cause it to blow.

If fried as in overheated it would be caused by a poor fuse to terminal connection = resistance = heat but that should not cause the fuse to blow.

Garry
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Old 10-28-2010, 06:48 AM   post #11 of 29
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Default Re: Oil Pressure Light Blinking

Thanks guys. Yeah, I started thinking over voltage wouldn't be the issue, but something is amiss with the regulator. Maybe a bad ground? I will try cleaning the contacts and see once I get the flywheel off. The blown fuse "fused" itself to the fuse clip and I just about destroyed the clip getting it out. In fact I've been searching online for a new clip but can't find one like the OEM version. I also don't see it as a part listed on the Toro parts sight.
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BX25, 54" MMM, 5' Rake, Wallenstein BX42 PTO Chipper, Woods Rear Blade, 54" front blade, 48" box blade, Ratchet Rake.
1993 Wheel Horse 520-H, 48" deck & vac bagger.
1967 Wheel Horse 1077 with 36" RD deck (in resto).
Cyclone Rake, and other toys, I mean tools
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Old 11-01-2010, 06:59 AM   post #12 of 29
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Default Re: Oil Pressure Light Blinking

Anybody that needs a new fuse holder and clips for a 300/400/500 series WH, I found an on-line source. I think this guy may be on here, not sure, but I know he posts over at redsquare. Goes by the name Eldon. Anyway, his site popped up on a Google search. I couldn't find the OEM type fuse holders or a similar fuse box. Most have one positive lead coming into the fuse box where you can then wire individual breakers/circuits off of the single power lead. The WH OEM fuse box has four slots for 4 individual circuits - that is separate power leads into and out of the box. Anyway, here's the link.

http://www.classickitchensandmore.co...rm-p-1509.html

I couldn't get the flywheel off so I never did check the regulator. I'm going to wire up the new fuse box then see what I get. Doubt the fired 30 amp fuse is the only issue, but we'll see in due time.
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BX25, 54" MMM, 5' Rake, Wallenstein BX42 PTO Chipper, Woods Rear Blade, 54" front blade, 48" box blade, Ratchet Rake.
1993 Wheel Horse 520-H, 48" deck & vac bagger.
1967 Wheel Horse 1077 with 36" RD deck (in resto).
Cyclone Rake, and other toys, I mean tools
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Old 11-02-2010, 06:05 PM   post #13 of 29
CHDinCT
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Default Re: Oil Pressure Light Blinking

Need some help. I had the air cleaner housing sitting loose on top of the engine while I checked and cleaned the crankcase breather (look fine by the way). A few hours later while working over by the fuse holder, the housing slipped off the engine to my garage floor. No big deal except this tube you see in the pic was connected somewhere but I don't know where. It's not the vac hose that goes to the "power meter" on the dash as I see that still in tact. Anyone know where the other end of this tube hooks to? A scan for open ports somewhere did not uncover anything. I don't have an illustrated parts list for the 520 or I'd look it up that way. Thanks for any clues.

[IMG][/IMG]
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BX25, 54" MMM, 5' Rake, Wallenstein BX42 PTO Chipper, Woods Rear Blade, 54" front blade, 48" box blade, Ratchet Rake.
1993 Wheel Horse 520-H, 48" deck & vac bagger.
1967 Wheel Horse 1077 with 36" RD deck (in resto).
Cyclone Rake, and other toys, I mean tools
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Old 11-02-2010, 07:16 PM   post #14 of 29
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Default Re: Oil Pressure Light Blinking

Quote:
Originally Posted by CHDinCT View Post
Anybody that needs a new fuse holder and clips for a 300/400/500 series WH, I found an on-line source. I think this guy may be on here, not sure, but I know he posts over at redsquare. Goes by the name Eldon. Anyway, his site popped up on a Google search. I couldn't find the OEM type fuse holders or a similar fuse box. Most have one positive lead coming into the fuse box where you can then wire individual breakers/circuits off of the single power lead. The WH OEM fuse box has four slots for 4 individual circuits - that is separate power leads into and out of the box. Anyway, here's the link.

http://www.classickitchensandmore.co...rm-p-1509.html

I couldn't get the flywheel off so I never did check the regulator. I'm going to wire up the new fuse box then see what I get. Doubt the fired 30 amp fuse is the only issue, but we'll see in due time.
*************

Yes--I have met Eldon several times in the past--that 'link' is his daytime gig.

He started doing repro parts, etc. a couple years ago, I beleive.

His work is quality done, and he is a wealth of Wheelhorse info. Woiuld deal with hgim again if he had something I needed, I didn't know he was doing decals, however.

glenn

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Old 11-02-2010, 08:27 PM   post #15 of 29
300zx
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Default Re: Oil Pressure Light Blinking

Quote:
Anyone know where the other end of this tube hooks to?
Chris, there is an air cleaner sensor under the dash. It is square with a 1/4 inch connection for the hose. It also has an electrical connection that goes to the warning light console for when the air cleaner needs to be changed. If you want to see what the sensor looks like, look at component 32 in the electrical system of the parts break down.
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John's Horse Barn:

1967 857 (Restored in 85), 36" deck, front blade, plow
1977 C121-8 (Restored in 88) w/rebuilt 16 hp Kohler, 42" recycle deck, Tiller, Snow Blower and Cab, Plow, Front Blade, mounted Sprayer & Spreader
1979 C161 Auto (Restored in 10), 42" deck
1979 B7100D Kubota (Refreshed in 10), FEL, Snow Blower, Front Blade, Woods Mower, Tiller, Plow, Dirt Scoop
1985 312-8, 36" deck
1989 520-H, 48" deck
1990 520-H,48" deck
1991 520-H
1993 520-H
2007 ZG20 Kubota ZTR
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