ZK MasterTech - Invidious

ZK MasterTech

Welcome to ZK MasterTech.

Follow Master John Deere Ag Technician Zeth Key as he takes you behind the scenes of diagnosing, repairing, and rebuilding some of the most advanced farm equipment in the world. From massive 9RX tractors to S-Series combines, this channel shows the real work required to keep modern agriculture moving.

Zeth is a 2007 Automotive Graduate of WyoTech in Laramie, Wyoming and a 2023 WyoTech Hall of Fame Inductee. He currently works for Sloan Implement in Atwood, Illinois, bringing over 16 years of experience servicing and repairing John Deere equipment across central Illinois.

ZK MasterTech gives viewers an inside look at the technical side of agriculture — real diagnostics, field service calls, major repairs, and the problem-solving it takes to keep farmers running.

If you enjoy seeing big iron torn down, diagnosed, and put back to work, you’re in the right place.

Subscribe and follow along as we keep that green iron moving! 🔧💚

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49:28

6 Breakdowns… Oil in coolant, broken gears and a major injector job

ZK MasterTech

Shared 6 days ago

40K views

55:35

Storm WRECKS Two John Deere Tractors… 6 Breakdowns

ZK MasterTech

Shared 1 week ago

46K views

55:07

Spring ’26 Service Calls Are BACK… 6 Breakdowns & a RARE Navy 8560

ZK MasterTech

Shared 2 weeks ago

67K views

30:57

This 9100 Ran Away at 3,000 RPM...Then Turned Into a No-Start Nightmare

ZK MasterTech

Shared 3 weeks ago

88K views

45:01

640HP John Deere 9RX Catastrophic Failure… FULL REBUILD

ZK MasterTech

Shared 1 month ago

67K views

57:46

Building a 640HP Monster — 9RX 640 Rear Axle Rebuild, Wide Stance Kit & First Startup

ZK MasterTech

Shared 1 month ago

58K views

1:06:02

If This Isn’t PERFECT… 640 HP Will Destroy This 9RX Axle

ZK MasterTech

Shared 1 month ago

77K views

28:58

Coolant in the Intake?! John Deere 9530T EGR Failure + 8R 370 Diagnosis

ZK MasterTech

Shared 1 month ago

36K views

46:47

9RX 640 Tear Down Continues — The Rear Differential Damage is Unreal

ZK MasterTech

Shared 2 months ago

93K views

3:42

9RX 640 Failure Recap — Pump Stack & Scavenge Pump Investigation

ZK MasterTech

Shared 2 months ago

18K views

40:01

Cab Off the 9RX 640… Pump Stack Failure Confirmed

ZK MasterTech

Shared 2 months ago

88K views

4:00

9RX 640 Failure Story So Far… Pinion Gear Teeth Destroyed

ZK MasterTech

Shared 2 months ago

24K views

53:14

After NFMS 2026 and Fixing an S790, This 9RX 640 Showed Up Destroyed

ZK MasterTech

Shared 2 months ago

65K views

51:50

Hydraulic Nightmare! This John Deere 6300 Had ZERO Oil Pressure…

ZK MasterTech

Shared 2 months ago

85K views

52:31

What Caused This S780 5 Speed Feeder House Gear Case Failure?

ZK MasterTech

Shared 2 months ago

52K views

38:59

After Everything This 9520 Went Through… This Is the Moment

ZK MasterTech

Shared 2 months ago

46K views

50:41

Replacing a Failed 12.5L — John Deere 9520 Complete Block Build

ZK MasterTech

Shared 2 months ago

69K views

1:03:41

The Most Optioned $1M John Deere X9 — Full Inspection

ZK MasterTech

Shared 2 months ago

36K views

37:44

X9 Shop Repairs & a Look at a $1M X9

ZK MasterTech

Shared 2 months ago

53K views

57:59

Worst Equipment Carnage I've Ever Seen

ZK MasterTech

Shared 4 months ago

107K views

42:37

Oil Pressure Was “In Spec”… Then This 9520 Engine Destroyed Itself

ZK MasterTech

Shared 4 months ago

129K views

1:02:08

We Put It Back Together… Did This 9.0L Survive?

ZK MasterTech

Shared 4 months ago

45K views

46:48

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

ZK MasterTech

Shared 4 months ago

59K views

1:13:45

S670 Engine REMOVAL & Tear-Down… You Won’t Believe What I Found Inside!

ZK MasterTech

Shared 5 months ago

109K views

44:59

The 8320 That REFUSES to Run!

ZK MasterTech

Shared 5 months ago

87K views

51:40

Rear Drive GONE… 9RX Would Only Pull With the Front Tracks

ZK MasterTech

Shared 5 months ago

71K views

1:00:28

It Ate Something BAD… 💥 Shop Carnage + Harvest Fixes!

ZK MasterTech

Shared 5 months ago

84K views

45:27

9620RX MAJOR Oil Leak + 9520 Engine Lockup! Harvest Service Calls 9 ✅

ZK MasterTech

Shared 6 months ago

55K views

13:44

✅ 3 NEW Must-Have Milwaukee Tools That Are Game Changers in the Ag Shop!

ZK MasterTech

Shared 6 months ago

16K views

39:26

9R breakdowns & S670 engine Backfires Through the Intake — She’s About to Blow!

ZK MasterTech

Shared 6 months ago

81K views

47:55

Service Call CHAOS! 😳 Massey Fire + Dead 9R in the Woods | Harvest ’25 #7

ZK MasterTech

Shared 6 months ago

91K views

57:03

⚠️ S780 won’t swing unloading auger | 💪 8310R hard steering | 🔥 The X9 Strikes Again!

ZK MasterTech

Shared 6 months ago

48K views

41:51

X9 Turbo Leak, S780 Transmission and separator clutch Failure, X9 hits a pole with unloading auger!

ZK MasterTech

Shared 6 months ago

47K views

1:11:01

8RX 410 track, 9360R Radiator, X9 Issues & S780 Electrical Gremlins | Harvest 2025 Service Calls 4

ZK MasterTech

Shared 7 months ago

50K views

1:00:43

Fuel Pump Failure, DEF Issues & X9 Breakdowns | Harvest Service Calls 2025 Ep. 3

ZK MasterTech

Shared 7 months ago

55K views

56:12

Major Combine Repairs in the Heat of Harvest! Good ol' 70 Series combine, Got to love it!

ZK MasterTech

Shared 7 months ago

69K views

40:17

Chasing Harvest Breakdowns | Service Calls Across Multiple Days (EP. 1)

ZK MasterTech

Shared 7 months ago

31K views

56:47

John Deere S680 Feeder House Floor, Augers & Driveshaft Repairs + S790 service call

ZK MasterTech

Shared 8 months ago

36K views

1:15:49

Farm Progress Show 2025, New MONSTER 9RX 770 + Game-Changing S780 Repair Tips

ZK MasterTech

Shared 8 months ago

28K views

23:33

One day we won't need operators in the driver's seat! New X9 with ultimate technology package!

ZK MasterTech

Shared 8 months ago

43K views

58:28

John Deere S770 Combine | Major Feederhouse Rebuild, Hydraulic Fixes & PowerCast Upgrades

ZK MasterTech

Shared 8 months ago

34K views

48:12

First Look: John Deere S7 800 Through a Master Technician’s Eyes

ZK MasterTech

Shared 8 months ago

71K views

1:11:34

S790 Cleaning Shoe Alignment — Why Your sieve frame is rubbing hard to one side.

ZK MasterTech

Shared 9 months ago

34K views

54:03

Critical Repairs Before Harvest on this John Deere S790.

ZK MasterTech

Shared 9 months ago

46K views

36:45

Game-Changing Upgrade for John Deere S790! | Sloan Express Feed Accelerator Install

ZK MasterTech

Shared 9 months ago

43K views

1:28:20

John Deere 9560RT Hard Start FIXED – Timing Issues, Injector Replacement & Pro Tips

ZK MasterTech

Shared 9 months ago

83K views

48:47

8295R 1500 MFWD Axle Seal Replacement + 8210 Rescue Mission!

ZK MasterTech

Shared 10 months ago

181K views

1:31:03

S790 Inspection Masterclass – Everything You Need to Know

ZK MasterTech

Shared 10 months ago

36K views

33:48

X9 Rock Damage, Elevator Repairs & Serious Chopper Upgrade!

ZK MasterTech

Shared 10 months ago

28K views

50:19

X9 Repairs, 8295R Axle Seals & 8235R Fan-to-Radiator Damage

ZK MasterTech

Shared 10 months ago

34K views

31:31

9570R Field Fix, 3046R fuel sender, and a Shop Head-Scratcher on the 8360RT

ZK MasterTech

Shared 11 months ago

36K views

51:22

Pure Grit: 9100 ECU Hail Mary, Electrical Gremlins & Wrenching Past Sundown.

ZK MasterTech

Shared 11 months ago

44K views

29:50

Tractor Trouble: 8310RT Breakdown, 8370R CAN Faults, 9570RT Regen Issues – 9100’s Gone!

ZK MasterTech

Shared 11 months ago

41K views

45:46

Fixing Everything: 9570R, 9100, 8R 340, 4630 & Even My Truck!

ZK MasterTech

Shared 11 months ago

38K views

37:58

The 9100 Refuses to Run… and the 8R’s Fan Goes Full Turbo!

ZK MasterTech

Shared 1 year ago

40K views

33:11

Overrev, Regen Fails & Electrical Chaos | Deere Diagnostics Madness!

ZK MasterTech

Shared 1 year ago

49K views

32:51

AutoTrac FAILS on a 9R 590… and the 9530 Won’t Stop Throwing Codes 😤

ZK MasterTech

Shared 1 year ago

47K views

49:26

Big Repairs, Bigger Machines! | John Deere 8400R & 8R 370 Fixes

ZK MasterTech

Shared 1 year ago

69K views

56:45

🔧 Massive John Deere Repairs: 8400R Harness Headaches & 8360R ILS Overhaul!

ZK MasterTech

Shared 1 year ago

116K views

37:11

🔥 Stubborn Bolt Battle on a Mint 8310! + 9630 SCV Update & 8360R Prep

ZK MasterTech

Shared 1 year ago

84K views