Micropump GM Series Service Instructions User Manual
Page 5
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.
Howard Road, Eaton Socon, St.
Neots, Cambridgeshire, PE 19 8ET England, • Phone: (44) (0) 1480-356600• Fax: (44) (0) 1480-35630
0
REVISION
LTR.
DESCRIPTION
DATE
BY
A
ORIGINATED PER E14164
1/28/04
CMA
PART NUMBER:
L23154
Page 5 of 9
5.2.2 Remove all metal particles from the driven magnet (12) and hub assembly by
pressing adhesive side of masking tape against particles and removing tape.
Note: Loose iron particles and metal filings will be attracted to the magnet
surface and must be forcibly removed to prevent introducing rust into the system.
6
Repair of Pump Assembly
Note: Repair of the pump assembly is primarily limited to replacing parts.
6.1
Replace any part which exhibits damage such as wear, cracks, breaks, and
excessive scoring. See section 6.4 below regarding scoring of the wear
plates (4) (or bearing plate (2) and pump body (10) if wear plates are not
used).
6.2 Replace bushings (3) to correct for side “rub” marks on inside of magnet
cup (13) and on side of driven magnet (12). See repair instructions,
section 6.5.
6.3 Replace cavity plate (8) if gear cavity bores indicate excessive wear or damage.
6.4
Scoring of wear plates (or bearing plate & pump body when wear
plates not used)
6.4.1
Score marks that are deeper than 0.010” (.26 mm) cannot be corrected by
the following procedure and require replacement of the parts.
Minor scoring in the area of gear contact may be corrected by lightly sanding with
#600 wet/dry sandpaper. Place dry sandpaper on the surface plate, or equivalent flat
surface. A table top is not flat enough ! Do not use creased sandpaper! Lightly sand
in a “figure 8” pattern, taking care to keep the part flat against the sandpaper. Avoid
rocking the part, or applying unequal pressure to the top of the part. Normally the
deepest score marks will be found within a 1” (25.4mm) diameter around the shaft
holes. Typically, scoring outside this area can be removed after 4-6 passes, and all
but the deepest marks will be removed after 25-30 passes. If after 30 passes the score
marks occupy more than 10% of the total area in contact with the gear, replace the
part. Do not attempt to sand out deep score marks. Clean thoroughly after sanding;
see cleaning instructions in section 5.2.