The problem was a slow leak from the front seal. We decided to replace all o-rings.
here is the rebuild kit.
The 2 c-clips and the 2 smallest o-rings are only for non-LAD models.
The first section (from the back) is low pressure. 3 bolts and an o-ring.
Remove the 4 bolts to open the next the second section,
This is high pressure, 130 bar, and uses a special pump arrangement and seal.
To remove the shaft we removed the 2 pressure pistons under the 2 cross-plugs.
This is the tool we made to get them out.
To remove the shaft we removed the 2 pressure pistons under the 2 cross-plugs.
This is the tool we made to
get them out. It is not essential to remove the pistons since they are spring-loaded and can be pushed back into the
case.
Hopefully the plugs are not leaking!!
We had the press the tool into the plugs to get them out. The o-rings under the plugs were replaced.
Next, we pushed the shaft out of the flange
Removed the old seal and mounted the new one
The shaft was reinserted and the flange was remounted
This shows the old seal being removed. The o-ring lies within the hard plastic form.
New one is a direct replacement.
The 2 regular o-rings were replaced and the sections were rebolted.