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John Deere Tractors Discussion Forum

39JD A /Hand Clutch/Oil pressure

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Allan R

09-24-2006 12:00:54

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What is the best way to park the tractor, with the hand clutch engaged or disengaged ? and what is the proper setting for oil pressure?

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Allan R

09-25-2006 17:47:02

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Re: 39JD A /Hand Clutch/Oil pressure in reply to Allan R, 09-24-2006 12:00:54

Thanks For the Info Frank.
Allan

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F-I-T

09-24-2006 13:41:38

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Re: 39JD A /Hand Clutch/Oil pressure in reply to Allan R, 09-24-2006 12:00:54

Any of the hand clutch two cylinder tractors need to have the clutch engaged when parked or idling. There is a bearing in the pulley that rides on the crankshaft which only turns when the crank is turning and the pulley is sitting still. So, if you let the clutch engaged, the pulley and crank turn as one and the bearing doesn't have to work. These bearings get awfully hot and dirty over the years and never get cleaned and re-packed like they should, so keeping the hours down on that bearing is a good idea. Also, some of the early bearings didn't even have an inside race and just rode on the crank, so some early cranks have been damaged when the bearings were allowed to gall the crank.

On the oil pressure, that's always a broad discussion, but if you have a "good" labelled JD gauge, above "L" at idle and below "H" at fast idle is good. I have a fluid filled 1% gauge and that has worked out to be a range of 10 psi to 20 psi. Those old JD's depend on a high flow at low pressure to pump and fling and slop and dribble to the necessary parts. One of the secrets that JD designed into their engines starting with the "D" was "full-flow pressurized oil filtering", which means every drop of oil that is pumped goes through the filter. Most automotive engines still do not do that. That's one of the reasons why the oil filter element maintenance is so important on the old Deere's.

Frank

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Geoff Mathews

09-25-2006 09:09:17

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Re: 39JD A /Hand Clutch/Oil pressure in reply to F-I-T, 09-24-2006 13:41:38

We have our B (60617) since 1944, never changed the filter - no filter in there - just a brass mesh.

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F-I-T

09-25-2006 09:42:25

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Re: 39JD A /Hand Clutch/Oil pressure in reply to Geoff Mathews, 09-25-2006 09:09:17

It's true that they came with a Pur-O-Lator spun brass filter as original, but many were retro-fitted (there was a kit available) to accept the modern pleated paper element. You can of course wash and re-use the brass filter, but the paper element will filter by a significant factor in microns many times finer than the spun brass.

Old Cincinnati milling machines as well as the Kent-Owens I've worked around used the Pur-O-Lator spun element in their hydraulic tanks, but a LOT of silt got through. Cause a lot of cylinder and pump wear.

Frank

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