GLYCOL PUMP
15
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Repair Guide
STEP 15
CYLINDERS
Replace if there are ripples at each end of stroke area
(Fig. 15.1), or if there is scoring in the cylinder.
Note: A combination of cylinder wear and a piston wear
will decrease O-Ring squeeze.
INSPECTING PARTS
Figure 15.1
Figure 16.1
Figure 17.1
STEP 16
PISTON ROD SEAL RETAINER
These are very critical, since a lot of pump failures occur
from allowing wet and dry glycol to mix.
Replace if the surface where the O-Ring seats shows
wear (Fig 16.1).
NOTE: Check the inside surface where the O-Ring and
backup are placed. A good way to check this area is to
take a pencil and run it across the width of the surface and
see if there is any groove.
STEP 17
PILOT PISTON
Replace if there is a presence of scratches (Fig. 17.1), or
if there is a presence of uneven wear.
Repair if the rod has light scratches. They can sometimes
be smoothed out with 220 grit or fine emery cloth.
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