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clooney
03-26-2001 15:09:27
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Re: Re: Re: Re: Re: 630 whine in reply to Charles, 03-25-2001 18:02:18
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Charles, those old J.D.s with straight cut gears were designed & built at a time when gear oil was thick as tar & sticky as honey. There isn't much out there now that isn't meant to be used in high speed/high load conditions & most have EP additives in them for extreme pressure use. Unfortunately the trucking industry buys most of the present gear oil & as a result most present day gear oils must meet their specifications for low drag (high fuel mileage) & long wear at high gear loads at high seeds. I see there are a few people selling GL-1, 140W gear oil but I have never tried it myself (it might be like the old stuff & then again it might not) I am not a big fan of synthetic gear oil or even synthetic motor oil for that mater, as the few I have been involved in testing have had poor long term anti-corrosion qualities & poor condensation handling characteristics as well and due to their low viscosity/penetrating abilities are almost impossible to keep from leaking out of old cork, felt, leather sealed transmission & engines. Those synthetics have their place in high revving high speed racing applications & some cold start extreme weather conditions but as a rule are not a good trade off for everyday use in old equipment, especially if occasional use coupled with long storage is involved. In my personal straight cut gear tractors I use 70W or (80W motor oil if I can find it) as it has better anti-corrosion, dirt suspending, & cleaning abilities than gear oil, doesn't have any EP additives (they tend to etch bronze parts when stored)& are quite sticky as they aren't designed for modern automobiles that need low viscosity, low friction high mileage producing qualities. An 80W motor oil is about the same viscosity as 130-140W gear oil as they use a different rating scale than motor oils. I'm not recommending the use of motor oil in your transmission, I am just stating the fact that I use it & the reasons why I use it. I am not a lube specialist nor do I have a degree in that field but have been involved in the long term testing & durability testing of engines, transmissions, rear axles & transfer cases. I have also tried many different combinations of oil, grease & even old GL-1, 140W trans oils & found that as a rule, heavier stickier oils in the old J.D. straight cut gear transmissions do quiet the gear noise some (especially the higher frequency modes)but I have not found a lube that will quiet a very noisy trans to a pleasing level. As Mike said above, some of them were just noisy to begin with & there isn't anything you can do about it.
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