We’re back on the John Deere 850K you saw when we robbed the ripper for a military dozer. Today we finally deal with the real problems: blown-out hood/trunnion bushings, a leaking tilt/raise cylinder with bad chrome, and a blade with way too much play. We cut bushings, shim the ball sockets, rebuild cylinders, and oxy-lance a couple of frozen pins out of a scrap blade to keep this machine moving.
Along the way: why grease matters (hint: those bronze/steel bushings don’t last without it), why some late-model designs make shim jobs harder than they should be, and a few shop “adventures” involving air hammers, Harbor Freight gloves, and a near-fatal relationship with a vise.
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0:00 Cold open: “It’s gonna be a great day”
0:31 Recap: why we bought this 850K & what’s wrong
1:13 Hood/trunnion play diagnosed; grease points blocked by grill
2:02 Leaking tilt/raise cylinders; bad chrome spotted (~7,000 hrs)
3:14 Plan of attack: limb risers up, keeper/keyway access
4:06 Burning through stuck pins: setup & technique
5:38 First success; two more to go
6:25 Third time’s the charm — pins finally move
7:01 Blade play fix: shim plan & Deere’s long-bolt design rant
8:14 Heat on stubborn hardware; impact/torch cycles
11:03 The “automatic” air hammer and fastener marathon
11:38 Next day: parts delay, fluid/filter service in the meantime
12:38 $36 bolts from Brazil arrive; shim strategy by side
14:11 Shim stack choice: removing thick plate, leaving tunable thins
15:28 Forklift alignment & team set—closing blade gaps
16:50 More pin work; air hammer vs reality
19:16 “Filler band” snap-ring gland style cylinder—love to hate it
20:26 Band in, snap ring past the groove—cylinder apart
21:44 Breaking the vise (oops) and freeing the nut
23:22 Re-sealing & re-assembly prep
24:23 Locking the gland, cleaning bores, test-fit new pin
25:18 Lube, fitment, and operator self-preservation
26:03 Lift cylinder with damaged yoke coming off
26:49 Limb risers/short hood off to reach trunnion keepers
28:14 Keeper out, yoke slides—revealing the wear
30:02 Bald eagle intermission 🇺🇸
31:04 Sawzall + split technique to remove bushing shells
33:22 Press plan: freezer trick & puller options
35:01 New bushings & seals installed—keeper back in
35:56 Rebuilt cylinder on; chrome decisions for the other side
36:59 Junkyard safari for usable chrome rods
37:47 Oxy-lance practice (and a hot education)
43:02 Exothermic rod demo on ~8" thick steel
45:24 The stuck-pin from hell—heat, drive, and snap ring battle
47:06 Wrap: cylinder rebuilds pending, paint soon—like/comment/merch
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