GLYCOL PUMP
19
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Repair Guide
STEP 26
PILOT PISTON VALVE HOUSING REPAIR
If you are working on a newer pump, the Port plates will
be replaceable (Fig. 26.1). If you are working on an old
style pump, the surfaces on the Port plates will need to
be refinished (Fig. 26.2).
Use 80 grit sandpaper to buff out scratches or gouges.
Apply pressure with your hand in the top side by creating
a flat surface when sanding it. Move up and down 3 to 4
times.
To make sure the worst scratches have disappeared,
rotate the pilot piston housing 90º, press lightly and sand
it one more time (Fig 26.3). This will show if there are
more scratches to be sanded out.
After sanding it, use the air nozzle to make sure the
inside orifices are clear.
Repeat this process for the Main Piston Valve Housing.
Figure 26.1
Figure 26.2
Figure 26.3
INSPECTING PARTS
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