Micropump GM Series Service Instructions - Manual (Page 7)

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 7 of 9
7 Pump assembly (Refer to Figure 1)
Caution: Do all work on a clean surface free of metal particles.
7.1
Install driving gear (6) into pump body (10) center hole with the long end
of the gear shaft placed in the hole. The shaft should slide and rotate freely in the bushings
(if not: see repair instructions, section 6.5.5.).
7.2 Install driven gear (7) into the remaining pump body (10) hole containing
bushings, with the long end of the gear shaft placed in the hole. The shaft should slide and
rotate freely in the bushings (if not: see repair instructions, section 6.5.5). Check that gears
rotate easily and mesh without sticking. Place the two wear plates (if used) over the gears,
orienting the flow holes as shown in the drawing.
7.3 Install 2 dowel pins (5) into pump body (10).
7.4 If elastomer o-rings are used, apply a light even film of Dow Corning
vacuum grease or equivalent (do not use on Teflon seals). Apply grease
from capsule to the thumb and index finger of one hand, and transfer a light even film to the
surface by rubbing o-ring between thumb and index finger. Check that entire surface of o-
ring is coated with vacuum grease.
7.5
Install the 2 o-rings (9); one into the cavity plate (8) o-ring groove and
the other into the bearing plate (2) o-ring groove. Teflon o-rings may require slight
stretching in order to fit into the grooves.
7.6
Place the cavity plate (8) over the gears/wear plates (if used) and onto the
pump body (10) dowel pins. Press the cavity plate flush with the pump
body sealing surface.
7.7 Install 2 dowel pins (5) into cavity plate (8).
7.8
Place the bearing plate (2) over the gears/wear plates (if used) and onto the
cavity plate (8) dowel pins. Press the bearing plate flush with the cavity
plate sealing surface.
7.9 Install 6 screws (1) through the bearing plate (2) and into the pump body (10). Torque to 40
in-lbs. It is advised to apply a light oil to screw threads
and under screw head before installation.