My Ford 640 would lose all lift power in hot weather.The hydraulic fluid was a bit milky when I bought the tractor.Ford dealer said 134 would work fine it dosent.I dumped the 134 from the hydralic system and put in the 90w oil the service manual recommended and the trouble stopped.I can lift hardwood logs onto the sawmill in warm weather now.With the 134 I could not lift the 350 pound cordwood saw in warm weather.The experts will tell you that that the vane pump is NG and you have to spend 1500 bucks plus to convert to a piston pump.I spent 15 bucks to put some 90 w mineral oil in the system and it works fine.Its a little stiff in winter but a few quarts of 80w will fix that.Ford said add 2 quarts of 80w if you use the tractor in winter.My Ford service manual says 90 w all the way to the 1000 series.Many of these fools repeat wrong info on forums.They have no practical experience with hydraulics, Just pass on wrong information.I started working on tractor hydraulics in the mid 50s
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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