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GLYCOL PUMP
20
Repair Guide
INSPECTING PARTS
STEP 27
PILOT PISTON ASSEMBLY
Insert the Pilot Piston Seal Retainer with the bevel side
facing inside the pump. Push them in until you feel a
mechanical stop (Fig. 27.1).
Reassemble the Pilot Piston Bearings using the two
O-Rings and three backups (Fig. 27.2). Be sure to use
a light gravity motor oil to generously lubricate all your
O-Rings and Backups when assembling.
Insert the Pilot Piston Bearing with its O-Ring and two
backups in to the Pilot Piston Body (Fig. 27.3).
Place in both sides the O-Ring and Backup in top of the
Pilot Piston Bearing.
Push the Pilot Piston Cap over bearings and seat the
O-Rings in place (Fig. 27.4).
Place the Pilot Piston Cap by bolting it to the body. (Fig.
27.5) Insert the Pilot Piston Rod in the other side of the
Pilot Piston Body (Fig. 27.6)
Place the other Pilot Piston Cap in the other side by bolting
it to the body. Use a screw driver to move the pilot piston
making sure it is loose.
If the pilot piston is stuck loosen bolts on the caps until you
release it, then retighten bolts and check again.
Figure 27.1
Figure 27.2
Figure 27.3
Figure 27.4
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