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John Deere Tractors Discussion Forum
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Re: john deere 70 loud engine noise

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resting relics 1

04-11-2014 05:36:34

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Grandad, With no clutch in the tractor you've eliminated all of the possible transmission noises. It's either in the PTO driveline somewhere or the engine itself. It's possible the hydraulic pump drive or the pump itself I suppose. Can't remember if you can disconnect the pump like A's and 60's but if you can try that. Otherwise I guess you'll have to pull the crankcase cover and take a look at the rod bearings. They usually rumble or pound when they fail rather than squeal but I guess it could. Good Luck! John

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04-11-2014 05:51:27

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 Re: john deere 70 loud engine noise in reply to resting relics 1, 04-11-2014 05:36:34  
I have the reduction housing off. What is all involved in checking that main bearing on that side. Can I just pull that cast housing off and check the bearing. Also whats the easiest way to pull that inside gear off the crank?? Thanks in advance

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04-11-2014 10:24:04

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 Re: john deere 70 loud engine noise in reply to grandad.., 04-11-2014 05:51:27  
granddad...check the rod bearings first. Much easier than checking the mains. I assume this a gas model? You can check the rod bearings through the top crankcase cover. If your has a center main bearing, you need to pull that out with the crankshaft. If the engine runs ok cold at idle and starts to labor as it warms up...bearings.

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04-11-2014 06:44:05

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 Re: john deere 70 loud engine noise in reply to grandad.., 04-11-2014 05:51:27  
Pull the crankcase cover off and look for a broken oil line to the main bearing behind the clutch. Look for any broken oil lines in there.

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