john deere 8630 - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 11 (permalink) Old 01-28-2008, 02:33 AM Thread Starter
 
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john deere 8630

Im looking at john deere 8630 to plow with wonder if anyone know about their problems or a forum for tractors
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post #2 of 11 (permalink) Old 01-29-2008, 11:31 PM
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Where'd my post go? Hmmmmmm.

Anyhow, they are pretty decent tractors. Quite a few of the 30 and 40 series tractors have had their engines swapped for a 50 series. The earlier ones had some problems. Frequent overhauls at ~2500hrs and such. The 619CID engine wasn't one of Deere's best ones. They are cheap power, though.

The 60 series and newer do ride better. Air ride seats are a REAL plus. Don't ratle your teeth as bad.

One of my neighbors where I used to live had an 8650. Treated him good. Traded it later for a Deere 8770 4wd.

"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


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post #3 of 11 (permalink) Old 01-30-2008, 04:16 AM
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we had a 8630 for quite a while the only thing I can remember breaking on it was an axel. which brings me to my next point wach out what you do with that blade they can be hard on axels when you go to pushing with them. we broke the one on the 8630 and 2 axel housings on our ford vrersital 946 we replaced the 8630 with before we finaly got rid of the blade.

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post #4 of 11 (permalink) Old 02-01-2008, 01:02 AM
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The outer bearings in the axle housings tended to go at a fairly high rate, and seem to need adjustment pretty often. I'd almost guarantee that yours has a 50 series engine, like was said above, most of the originals are long since dead and gone. Beyond that, they really aren't too bad, I guess, depending on what you want it for. If all you're doing is drawbar pulling (don't need a 3point or PTO) I'd personally rather have an older Versatile or Steiger, in that order. They'll get the job done for less $$/hour, going by local experience.
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post #5 of 11 (permalink) Old 02-01-2008, 02:00 AM
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One thing to look out for on a 555 Versatile is the axle shafts/housings. My uncle owned 2 of them (555 Series 3). Both had the same problem. They have a slight alignment problem. The shafts have to be replaced about every 800hrs. Don't know if it is a mfg error or if the housings get damaged some how.

"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


"Obama = Hoax and Chains"

If Obama is the answer, it must have been a stupid question.
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post #6 of 11 (permalink) Old 02-18-2008, 06:44 PM
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To get ya back on track on an 8630, We'ved currently have owned one since new. And like so many, had to have a new motor at 800hrs. So, we went with the 50 series motor. And at 3500 hrs, we had to have it rebuilt. The 619 is a great motor....... if it's not bouncing around. There use to be alot of these motors out west running big pumps for 10,000 hrs without problems. But it's when the motor is bolted down solid in a tractor is when bad things happen. That's why the newer tractors have cushioned motor mounts. But I do know from experience that alot of hp can be made out of this motor if done right! Hope this helps.

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post #7 of 11 (permalink) Old 02-29-2008, 12:10 PM
 
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8630 with clutch pressure problems, all pumps working with main pressure of 2000#, clutch pressure 47# with 5# drop using clutch. tractor will not move, am I having bypass problems. clutch contol valve seems to be ok. no apparent leaks in gasket. have removed and replaced shims several times. I am missing something,,,any ideas.
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post #8 of 11 (permalink) Old 03-02-2008, 12:09 AM
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Might get more responses by starting your own thread, instead of adding to this one.

Anyhow, I'll need to look at a service manual for specs. I only have one for 4430, but it should get me a better idea on what to look for pressure-wise and other leakage tests since it has a Quad-Range trans w/ wet clutch, too. There is a chance you might need to replace the clutch, if it wasn't done recently. Went through that 2 yrs ago on the 44. It wouldn't move either. Didn't hardly have any linings left at all. Did have over 10k hours on it though. IIRC, it does take a few special tools to set it up, but the dealer could do that for you, too.

Is the hyd. oil staying cool? Leakage in any areas will be warmer/hotter than the rest of the housings. Areas like the clutch valving, hyd remotes, 3pt valving/rockshaft, steering..........

On the main hyd pressure, isn't it supposed to be closer to 2250 or 2350#?

"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


"Obama = Hoax and Chains"

If Obama is the answer, it must have been a stupid question.
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post #9 of 11 (permalink) Old 03-02-2008, 01:30 AM
 
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8630

motor new, clutch has less than 300hrs. stroke valve checked, all screens checked. i will check all pressures again after rebuilding hydraulic valve assembly and o-rings. thanks for comeback......
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post #10 of 11 (permalink) Old 03-04-2008, 01:25 AM
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Said you checked the screens, but how old is/are the hyd filter(s)?

4430 manual says you should have between 170 and 180psi in the clutch test port @ 1900rpms with oil up to temp. Move the lever for the direct/under drive back and forth. If the pressure difference is 10psi or more, you have excessive leakage. If both are low, check the press @ the PTO brake and PTO clutch ports. If PTO psi is OK and drive clutch is low, then you have excessive leakage in the clutch valve circuit.

Gauge in clutch port, push in the clutch pedal. PSI should go to zero. Re-engage slowly, and the PSI should come up slowly, if the modulating valve is moving freely.

Check the lube circuit. Should be no less than 15psi at operating temp.

Main hyd. pump psi standby should be 2250-2300# @ 17-1800 RPMs.

FWIW, the factory service manual is ~$60-100. great investment.

"Some people are educated beyond their intelligence."

'93 W350 CC, LE, 5spd, HTT modded H1C, 4" DE

Sold- '99 3500 Q/C, SO CTD, 4x4, 5spd.

Traded off- '97 3500 C/C, 4x4, CTD

'92 W250, LE, CC, CTD w/ tweaked pump (SOLD)


"Obama = Hoax and Chains"

If Obama is the answer, it must have been a stupid question.
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