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John Deere Tractors Discussion Forum
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4020D - Oil Pressure Gauge

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Jon (IN)

04-06-2005 19:21:06




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What do you guys do to know what oil pressure your 4020 is running? I just bought a '66 PS, and it does not have a guage, just a light. Do you remove an existing guage and put in a oil pressure, or maybe plumb one in by the engine? I always like to know where the oil pressure is at on my engines.

Thanks,

Jon




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msb

04-07-2005 06:43:55




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 Ever wonder why the lights in reply to Jon (IN), 04-06-2005 19:21:06  
The reason Deere engineers went to lights instead of gauges was they recognized that a lot of tractors,especially in the South were operated by hired help and a lot of them didn't know 20PSI from 40 PSI or what the pressure should run,They did know when a red light came on to stop the tractor.That was the reasoning behind the lights that service engineers told dealer mechanics at service schools back then.

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Gerald J.

04-07-2005 13:36:33




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 Re: Ever wonder why the lights in reply to msb, 04-07-2005 06:43:55  
Good answer for thinking types but the bean counters liked the lights because the light, light socket, wire, and pressure switch cost much less than a good pressure gauge with reliable plumbing. And cost less to install.

Gerald J.



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WTW

04-07-2005 14:25:51




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 Re: Ever wonder why the lights in reply to Gerald J., 04-07-2005 13:36:33  
In all honestly I would not be surprised to find out that there is allot of truth to what you say. But on thing I will also say and bet my bottom dollar on, is that a working warning light saved allot more (John Deere) engines than any oil pressure gauge ever did. The reason I say this is because I know for a fact that a red light coming on all of a sudden got allot more attention than the attention the oil pressure gauge needle got when it went down. Operators do not watch there gauges constantly. Ask John Deere owners how many 30 series tractor engines got ruined when the cam / oil pump gear took the big one and the common comment from the operator when this miss fortune happened was: I didn't notice the oil pressure low, but I did notice the tach quit working! The best option in my book would be both the gauge and the warning light which most modern equipment have. But if I had to choose just one I would take the light. Twenty five years repairing John Deere equipment and engines made me a believer. DW

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Gerald J.

04-07-2005 15:45:04




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 Re: Ever wonder why the lights in reply to WTW, 04-07-2005 14:25:51  
The switch would be even more effective if wired as a "Murphy" switch often used on unattended engines so if oil pressure disappeared the engine stopped. Probably would require electric stop on the diesel. And then an indicator of what happened. Like some recent Briggs engines.

Gerald J.



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G/MAN

04-08-2005 07:46:04




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 Re: Ever wonder why the lights in reply to Gerald J., 04-07-2005 15:45:04  
We see quite a few New Gens set up with Murphy gauges around here. If the tractor is a key-start later model, it's simple to wire the "ignition" wire to the pump shutoff right through the 117 switch. If it's a tractor that's shutoff with the throttle lever, you must install an in-line shut-off in the fuel supply line. A lot of guys use them on booster pumps for irrigation. I've even installed Murphys on a 7700 of all things. Pretty high-dollar tractor for running a booster pump, IMHO. I also installed a tranny-pressure switchgage on that one.

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Jim in AK

04-06-2005 21:55:01




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 Re: 4020D - Oil Pressure Gauge in reply to Jon (IN), 04-06-2005 19:21:06  
I got a 4010D. When the eng. was rebuild I installed a standard 2' gauge in the dash. It looked to me that there was room for two gages one on ether side of the dash. I had no problems installing an oil gauge in the dash of my 4010.

Jim in AK



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Gerald J.

04-06-2005 20:31:00




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 Re: 4020D - Oil Pressure Gauge in reply to Jon (IN), 04-06-2005 19:21:06  
If you have a sychrorange transmission, there are places in the dash casting not cut through for two more gauges used with the PS transmission. A standard 2" gauge mounts from the rear. I cut the upper left one out (drilled out the middle, then filed it out to size with a taper like the factory holes) for an ammeter on my 4020 gas. I was able to cut off the twin gauge hold down so it was good for two gauges, instead of the original one per hold down.

Otherwise one could find an above dash gauge case for a hot rod and mount that above the cowl for the added gauge. I bought one for that purpose until I discovered the casting was ready for two more gauges.

The plumbing to a gauge does expose the engine oil pressure to more joints that can fail and kill off the engine by running the oil out on the ground. Sometimes I wonder if that added plumbing isn't as hazardous to the engine as ignoring the oil light.

Gerald J.

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