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Re: Re: Re: Hyd. pump noise

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Posted by david on December 09, 2002 at 11:16:03 from (

In Reply to: Re: Re: Hyd. pump noise posted by charles on December 09, 2002 at 08:17:14:

Generally a buzzing sound would be a relief circuit opening (safety valve) to relieve high pressure. High pressure would be caused by cold oil, water contamination, dirty filter or intake screen. Generally speaking if it is cold oil operate at low speeds until oil warms to operating temp to prevent oil starvation at the pump. Also, generally speaking, if the pump is damaged you will know it pretty soon, if it hasn't been don't worry about the "past". There are arctic oils which are similar to Dextron III ATF. This is a red base stock which will cause you much unhappiness if you are using a brown base stock oil and the system is not well cleaned. Because of the "thinness" of the oil you can expect more internal leakage at the pump, seal weeping, and if you have been using an R&O base oil lots of loose dirt in the system as the detergents clean things out. A compromise is to use Tractor Hydraulic Fluid (I happen to like Multi trac by Coastal but any THF should be ok from the same color base as what you are using). Drianing system and filling with THF will give ou a good compromise. Expect more seal weep in hot weather. I run THF in all my self contained systems. Used to use R&O in them and THF in the transmissions. Accidentally mixed them in a self contained system and created a "green, gelatinous mixture which attacked rubber o-rings and plugged up the works. Got it cleaned out and now only use one fluid in everything. Did sell my powershift tractor b/c I prefer a red base stock fluid in them.

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