JD 9400 combine - what goes wrong with the 359 engine?

andy r · Feb 17, 2023

Neighbor has a John Deere 9400 combine with the 6 cylinder 359 cid engine for sale. Later models had a slightly larger engine. Over the years I have heard of problems with this engine centered around the harmonic balancer or possibly all of the pulleys running off of the front of the engine. Can someone with experience tell me what the problems are with this engine? Do these engine problems plague most of the 9400 combines eventually? This combine has nearly 6000 engine hours on it and he can't seem to find a buyer. It has been listed on the internet with nearly 250 looks. It even sat at the local John Deere store on consignment through two harvest seasons before he finally brought it home. If the harmonic balancer goes bad how much does it cost to get it running again? Does it ever require a crankshaft or just the balancer/pulleys? Thanks.

coonie minnie · Feb 17, 2023

It's my understanding that there's too much pulley on the front of the crank, and either balancers or the crank fails. Otherwise they are a good combine.

ADB-Ia · Feb 17, 2023

Never heard of that problem before - not denying that it's true, but doubt that it's real common. A 359 engine is common enough that finding parts or replacement engine shouldn't be big problem. That is fairly high hours for a combine though.

Erik Ks farmer · Feb 17, 2023

A google search for 9400 John Deere 359 brings up several threads on ag talk with lots of information.

JD 9400 combine - what goes wrong with the 359 engine?

andy r

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coonie minnie

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ADB-Ia

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Erik Ks farmer

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