Posted by jimg.allentown on December 23, 2015 at 20:11:15 from (173.49.143.208):
In Reply to: Auto question posted by Stephen Newell on December 23, 2015 at 17:44:04:
I will add a few facts here......
First, power steering is a simple and basic hydraulic system. The pump is generally a vane type of a high capacity and flow rate. It powers either a hydraulically assisted steering gear or a hydraulically assisted rack and pinion steering gear.
Oil used was originally (in the "old" days) type A automatic transmission oil. The reason for this oil was the lower viscosity as compared to engine oil and anti-foaming characteristics of the ATF. In most cases, and with RARE exception, almost ANY ATF is usable and compatible. More so than engine oil- although there were power steering systems that did use engine oil.
The main reason to stay away from used engine oil is the possibility of introducing particles that could be large enough to cause problems for the spool valve in the steering gear - whether it be a steering box or a rack and pinion. Grit is deadly to a spool valve.
Best way to deal with leaking power steering rack is to add a bit of brake fluid to the system. Brake fluid will SOFTEN UP the seals to allow them to seal more positively without depriving the critical parts of lubrication. Recommend no more than about 1/4 of a cup of brake fluid to be added. I have used this trick for many years on many vehicles with good results.
Now, I am sure that somebody or somebodies will contradict me and say that I am wrong, but I see no harm in using ATF in the power steering.
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