MICROPUMP, INC.
A Unit of IDEX Corporation
PO Box 8975, Vancouver, WA 98668-8975 • Phone: 360/253-2008 • Fax: 360/253-8294
MICROPUMP
LIMITED
A Subsidiary of Micropump, Inc.
2 Howard Road, Eaton Socon, St.
Neots, Cambridgeshire, PE 19 8ET England, • Phone: 011-44-1480-356600 • Fax: 011-44-
1480-
356300
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7.2.5 Place drive gear (11) in center hole in body assembly (2). Insert driven gear (12)
in other hole in body assembly. Spin gear (11) to check mesh and free rotation.
7.2.6 Lightly lubricate O-rings (8) and (9) with specified grease. Install on each side of
base assembly (7) with odd-shaped O-ring groove on pump side of base. Mate
base assembly (7) to body assembly (2).
7.2.7 Press driven magnet assembly (6) onto protruding slotted shaft of drive gear
(11) with raised side of magnet assembly on motor side of assembly. Press to
dimension shown in Adjustments (See Figure F).
7.2.8 Install cup (5) and plate (4) so that raised lugs on plate face away from pump
assembly. Install four screws (3) and tighten.
7.2.9 Lightly grease O-ring (37) with specified grease and place on lip inside pressure
switch hole in body assembly (2). Install piston (38) in pressure switch hole.
Attach cylinder (36) to body assembly (2) with four screws (35).
7.3 Assembly of Motor and Drive Housing Assembly with Pressure Switch (-1). Refer to
Figure 3 in IPL.)
CAUTION: DO ALL WORK ON A CLEAN SURFACE.
7.3.1 Thread setscrew (2) part way into drive magnet (3).
7.3.2 Rotate rotor shaft to align flat portion of shaft with access hole in drive housing
(4).
7.3.3 Install drive magnet (3) on rotor shaft so that setscrew (2) aligns with flat portion
of shaft.
7.3.4 Set drive magnet (3) to axial dimension specified in Testing and Troubleshooting
and tighten setscrew (2) with 3/32 inch (2.381 cm) hex key.
7.4 Assembly of Pump Assembly (5) and Motor and Drive Housing with Pressure Switch
(6). (Refer to Figures 1 and 2 in IPL.)
7.4.1 Mate pump assembly (5) to motor and drive housing assembly with pressure
switch (6).
7.4.2 Install six screws (4) and tighten.
7.4.3 Insert sleeve (13) into cylinder (37), followed by shim (14) and spring (12).
7.4.4 Install screws (7) and tighten.
7.4.5 Submit Model 668-400-2 to pump test. See Testing and Troubleshooting.
