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5.1.2 Visually check inside surfaces of cup for rub marks. Marks on back indicate a
loose magnet assembly fit on gear shaft. Side marks indicate worn bushings or
radial misalignment. Refer to Testing and Troubleshooting and Repair.
5.1.3 Check O-ring grooves on both side of base assembly for foreign material that
might cause O-ring to seat improperly.
5.1.4 Visually check gears for wear. Check that shafts are not deeply grooved and that
gear teeth have not changed shape as compared with a new gear. Slight
grooving of shafts is normal if grooves look polished.
5.1.5 Check gear movement for backlash and smooth meshing. Look for tight centers
or any tendency to stick.
5.1.6 Inspect bushings in body assembly and base assembly. Using a No. 30 drill
blank, check that interior surfaces are not excessively worn out of round. Drill
blank should pass all the way through but not be loose.
Note: Gear shafts normally fit loosely in bushings. Excessively loose bushings,
however, can cause wear and should be replaced. Refer to Repair.
5.1.7 Inspect cavity in body assembly and wear surface on base assembly for
excessive wear or imperfections. Some circular grooving is normal and not
undesirable.
5.1.8 Check inlet screen for foreign material that could restrict flow.
5.1.9 Check ball in flow sensor/system check/over-pressure release valve assembly
for resiliency.
5.1.10 Inspect orifice in pressure switch assembly section of body for foreign material
that might be clogging the hole.
5.1.11 Check all O-rings (seven in all) in pump assembly for cracks and wear.
5.2 Condition of Motor and Drive Housing Assembly with Pressure Switch
5.2.1 Drive Magnet Assembly Condition
5.2.1.1 Visually check drive magnet assembly for chips, cracks or other damage.
5.2.2 Rotor and Bearing Condition
PO Box 8975, Vancouver, WA 98668-8975 • Phone: 360/253-2008 • Fax: 360/253-8294
2 Howard Road, Eaton Socon, St.
Also check for magnetic grit accumulation. Refer to Repair and
Cleaning.
Note: It is not necessary to disassemble motor for following checks.
MICROPUMP, INC.
A Unit of IDEX Corporation
MICROPUMP
A Subsidiary of Micropump, Inc.
Neots, Cambridgeshire, PE 19 8ET England, • Phone: 011-44-1480-356600 • Fax: 011-44-
LIMITED
356300
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