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 18 of 33
2.5.1 Troubleshooting is mainly concerned with determining the nature of a trouble
and making a decision to repair or replace.
2.5.2 The Troubleshooting Chart in Table 1 fully describes the routine for determining
the possible cause of a malfunction. Possible causes are listed in order of ease
of verification. When correction involves disassembly and replacement, refer to
Disassembly and Assembly, respectively, for procedures. See Checks for
procedures used to verify causes.
3. Disassembly
Note: Complete disassembly of the Pump Unit is not always required. Refer to Testing and
Troubleshooting and establish Pump Unit condition or possible cause of its
malfunction to determine extent of disassembly needed.
3.1 Disassembly of Model 668-400-2. (Refer to Figure 1 in IPL)
CAUTION: IF IT IS NECESSARY TO CLAMP UNIT IN A VISE TO REMOVE
EXTERNAL FITTINGS, CLAMP ONLY AT FLAT SURFACE ADJACENT TO
PRESSURE SWITCH.
3.1.1 Remove clamp (2) that attaches bracket (3) to Model 668-400-2.
3.1.2 Set clamp (2) and bracket (3) to one side.
3.2 Disassembly of Pump Assembly (5) from Motor and Drive Housing Assembly with
Pressure Switch (6). (Refer to Figure 1 and 2 in IPL.)
CAUTION: IF IT IS NECESSARY TO CLAMP UNIT IN A VISE TO REMOVE
EXTERNAL FITTINGS, CLAMP ONLY AT FLAT SURFACE ADJACENT TO
PRESSURE SWITCH.
3.2.1 Remove six screws (4) holding pump assembly (5) to motor and drive housing
with pressure switch (6).
3.2.2 Remove screws (7) holding pump assembly (5) to motor and drive housing with
pressure switch (6).
3.2.3 Separate pump assembly (5) from motor and drive housing with pressure switch
(6).
3.2.4 Remove spring (12), shim (14) and sleeve (13) from cylinder (36).
3.3 Disassembly of Pump Assembly (-1). (Refer to Figure 1 & 2 in IPL.)
Note: Place all parts on clean surface.
