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Re: Slow hydraulics on Ford 641D


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Posted by Richard H. on June 13, 2006 at 12:36:03 from (64.184.8.182):

In Reply to: Re: Slow hydraulics on Ford 641D posted by Hal/WA on June 13, 2006 at 11:26:59:

First off, water has air in it... pour some water and oil in a can and shake or stir it vigorously and you will see what I mean.
The water in the system usually comes in at the hyd. main spring at the back of the top cover thru a weak seal. One place air can cause you a problem and probably is, is the seal at the back of the pump shaft. When you pull the wobble shaft out you will feel a groove where the seal rides. If so you will need to replace the shaft, bearing and seal.
In comes the welder...,the seal is behind the bearing race, to get the race out you run a small bead inside the race to shrink it and then you can tap it out. While at it you should pull the top cover off and thoroughly clean and blow out your lines. You will be amazed at the amount of shutt in the sump.
HTH. Richard


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