Small Problem, HUGE Repair — Intake Valve Failure on a 9.0L

ZK MasterTech December 13, 2025
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ZK MasterTech

@zkmastertech

About

Welcome to the ZK MasterTech! See what it's like to dive into the world of a Master John Deere Ag Technician, Zeth Key. A 2007 Automotive Graduate of Wyotech in Laramie, WY and 2023 WyoTech Hall of Fame Inductee now finds himself working on John Deere diesel tractors and combines in the farm lands of central Illinois. Working for Sloan Implement in Atwood, IL for over a decade, Zeth has seen just about every failure your John Deere equipment can have. Subscribe to ZK MasterTech to see what it's like to repair some of the most advanced farm machinery you can buy! Being a John Deere technician is one of the most rewarding and challenging careers you can get into. Just like the whole industry, companies in AG have a hard time finding talented, experienced people. Hopefully this channel will show the world the technical side of agriculture and what it takes to keep the farmers going and to inspire a younger generation to pick up a wrench a start a great career with Sloan Implement!

Video Description

We start off with a look at the intake valve failure on the 9.0L engine out of the S670 combine. Before this engine can go back into the machine, I dig into replacing the water pump and the leaking main engine gear case input shaft seal. Once that’s handled, we shift gears while waiting on the cylinder head to return from the machine shop. Next up is an X9 1000 clean grain auger repair back at the shop. And then the next morning… it’s time to brave the cold. I throw on the gear and head out to a Bron 585 tile plow throwing DEF system faults. Quick diagnostics lead me straight to a failed DEF line that was preventing the dosing unit from priming. Swap the line, verify system function, and head back to the shop. By the time I get back, the cylinder head for the 9.0L is finally here! It’s time to get this thing installed and take you through the grueling process of torquing all those head bolts. This one’s full of diagnostics, field work, repairs, and plenty of wrench-turning action. Don’t miss a thing. Intro 9.0L engine prep – 00:00:29:53 9.0L water pump replacement – 00:04:55:41 MEG input seal replacement – 00:13:56:11 X9 clean grain auger – 00:18:11:58 Gearing up for the cold! – 00:22:12:36 Bron 585 DEF system problem – 00:22:47:27 The cylinder head is back! – 00:31:55:45 Let’s install the cylinder head! – 00:33:49:48 Want to see the best of ZK MasterTech? Check out my top repair and service videos here: https://youtube.com/playlist?list=PLhGcsfw6sbwx66pEkZpqLd_SF8jASNMgY&si=1aomfCy5TJ8d19kf Follow me on TikTok! the_zk_mastertech https://www.tiktok.com/@the_zk_mastertech?is_from_webapp=1&sender_device=pc Follow me on Instagram @zk_mastertech Want some ZK merch? https://zk-mastertech.myspreadshop.com/ Check out my Amazon store front! https://www.amazon.com/shop/zkmastertech Want a career with Sloan Implement? https://www.sloans.com/career Thanks to Sloan Implement and John Deere for their continued support. Subscribe for more in-depth diagnostics and field fixes. And as always — keep that green iron moving! #milwaukeetools #nothingbutheavyduty

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