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
Page 19 of 33
3.3.1 Remove screws (3) holding plate (4) to base assembly (7).
3.3.2 Remove plate (4) and cup (5).
3.3.3 Remove magnet assembly (6) by prying up between base assembly (7) and
magnet assembly.
3.3.4 Remove base assembly (7).
3.3.5 Remove O-rings (8) and (9) from both sides of base assembly (7).
3.3.6 Remove gear assemblies (11) and (12).
3.3.7 Remove bushings (10) from base assembly (7).
3.3.8 Remove bushings (13) from body assembly (2).
3.3.9 Remove screws (14) holding adjuster assembly (15) to body assembly (2) and
remove adjuster assembly.
CAUTION: DO NOT TAMPER WITH ADJUSTER SCREW (16) AND NUT (17);
THEY ARE PRE-SET.
3.3.10 Remove retainer (18), spring (19), retainer (20), O-ring (21), and piston (22).
CAUTION: KEEP THESE PARTS TOGETHER AND INSURE THAT SPRINGS
ARE KEPT WITH MATING PARTS.
3.3.11 Remove adapter (23), spring (24), sleeve (25), ball (26), plate (27), shim (28),
and spring (29). Remove O-rings (30) and (31) from both ends of adapter (23).
Keep all parts together.
3.3.12 Remove cap (32) from body assembly (2). Remove screen (33) and remove
O-ring (34) from cap.
3.3.13 Remove screws (35) attaching cylinder (36) to body assembly (2). Remove
cylinder (36), O-ring (37), and piston (38).
3.4 Disassembly of Motor and Drive Housing Assembly with Pressure Switch (-1). (Refer to
Figure 3 in IPL.)
Note: This manual covers overhaul and maintenance of the 668-400-2 Pressurematic
with the 9978 Motor and Switch Assembly
Note: Do not damage or shorten external wiring if motor is to be re-used.
