JD-400-D Loader/Backhoe oil pressure sender

NHEngineer · Sep 11, 2022

I figured out why the oil pressure gauge doesn't work on my 1970 JD-400 backhoe/loader. The wire is broken off and I don't see the other end anywhere near by. I'd like to rewire it but I can't find the sender. Would someone give me a hint as to where to look?

Tx Jim · Sep 11, 2022

Look at RH rear of engine block. IIRC engine crankcase vent tube blocks view of engine oil sender

NHEngineer · Sep 12, 2022

(quoted from post at 11:57:14 09/11/22)
Look at RH rear of engine block. IIRC engine crankcase vent tube blocks view of engine oil sender

Thanks. Is it a chore to access and replace or just typical?

Jim.ME · Sep 12, 2022

What engine do you have? As Tx Jim posted look at the right rear of the engine (right above the drive end of the starter in the clutch housing plate) and I think you will see it.

NHEngineer · Sep 12, 2022

(quoted from post at 11:10:44 09/12/22)
What engine do you have? ......

Four cylinder diesel.

NHEngineer · Sep 12, 2022

(quoted from post at 11:10:44 09/12/22)
What engine do you have? As Tx Jim posted look at the right rear of the engine (right above the drive end of the starter in the clutch housing plate) and I think you will see it.

Another question. I didn't see it on the YT WEB site. Probable just a standard, GM type oil pressure sender, right?

Tx Jim · Sep 12, 2022

I'll bet if you ask a YT parts personnel for the oil light sender JD part # AR65447 they could locate one

NHEngineer · Sep 12, 2022

(quoted from post at 11:10:44 09/12/22)
What engine do you have? As Tx Jim posted look at the right rear of the engine (right above the drive end of the starter in the clutch housing plate) and I think you will see it.

Somewhere in this area? Looks like I'll need to move that 150# hood forward a bit to see it.

Jim.ME · Sep 12, 2022

(quoted from post at 15:31:13 09/12/22)
Somewhere in this area? Looks like I'll need to move that 150# hood forward a bit to see it.

Here are a couple pictures of JD engines I have about the same vintage and size of your engine. I may be wrong; however I think you will find the port for the oil pressure light sender (or an oil pressure gauge tube) in the same location.

NHEngineer · Sep 14, 2022

Ah, under the oil filter. That should make my new life as a tractor mechanic a bit easier.

Thank you.

Tx Jim · Sep 14, 2022

Engine oil sender isn't under oil filter or even close to oil filter on JD utility tractor engines built from '65-'92

NHEngineer · Sep 14, 2022

The photo provided shows the starter and just above that, the oil pressure port and above what looks like the oil filter canister I think.

Sorry, the photo is a little blurry but it look to be right where the other photo shows it but there's what I hope is a 1/8" pipe plug in the hole. There may be another pressure port elsewhere but this one is readily accessible.

This post was edited by NHEngineer on 09/14/2022 at 07:35 am.

Jim.ME · Sep 14, 2022

(quoted from post at 10:18:55 09/14/22)
The photo provided shows the starter and just above that, the oil pressure port and above what looks like the oil filter canister I think.

Sorry but that is not the oil filter, that is the fuel filter, just like your tractor has.

If you don't have Operator's and service manuals get a set. Study the manuals, the operator's manual will show you the normal service points, like oil filter, and fuel filter for a couple.

JD-400-D Loader/Backhoe oil pressure sender

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