Maintenance procedures 3-75
When replacing the rotor seal, always check the ceramic stator face for chips
or cracks. If you find damage, replace it.
Refer to the figure “Rheodyne 7725i injector: exploded view” on page 3-73 for
this procedure.
To replace the rotor seal:
1. Leave the injector attached to the front panel of the pump, and leave the
knob on. If you need to remove the injector from the front panel, remove
the knob.
2. Remove the three stator screws.
3. Remove these parts by pulling axially:
a. Stator and stator face assembly (remove together). If the stator face
assembly is damaged, replace it.
b. Stator ring.
4. Pry the rotor seal off the four seal pins. Leave the isolation seal and
bearing ring in place.
5. Install a new rotor seal on the four seal pins.
Reassembling the injector
To reassemble the injector:
1. Loosen the pressure adjusting screw a half-turn. Note the original
position of the two red dots.
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