Blagdon Pump B75 Metallic - Manual (Page 20)

Blagdon Pump • A Unit of IDEX Corporation • R79 Shannon Industrial Estate • Co Clare, Ireland • Tel: +353 (0) 61 471933 • Fax: +353 (0) 61 475046
www.blagdonpump.com • E-Mail: [email protected]
x75mdl1sm-rev0812
Page 18
Air Operated Double Diaphragm Pump 6/05 Page 18
ACTUATOR PLUNGER SERVICING
To service the actuator plunger first
shut off the compressed air supply,
bleed the pressure from the pump, and
disconnect the air supply line from the
pump.
Step #1: See PUMP ASSEMBLY
DRAWING.
Using a 1/2" wrench or socket,
remove the four capscrews (items 11).
Remove the air inlet cap (item 8) and
air inlet gasket (item 20). The pilot valve
assembly (item 4) can now be removed.
Step #2: Inspect the actuator
plungers.
See ILLUSTRATION AT RIGHT.
The actuator plungers (items 30) can
be reached through the pilot valve cavity
in the intermediate assembly (item 5).
Remove the plungers (item 30) from
the bushings (item 7) in each end of
the cavity. Inspect the installed o-ring
(items 26) for cuts and/or wear. Replace
the o-rings if necessary. Apply a light
coating of grease to each o-ring and
re-install the plungers in to the bushings.
Push the plungers in as far as they will
go.
To remove the bushings (item 7),
first remove the retaining rings (item 31)
by using a flat screwdriver.
NOTE: It is recommended that new
retaining rings be installed.
Step #3: Re-install the pilot valve
assembly into the intermediate assembly.
Be careful to align the ends of the
stem between the plungers when
inserting the stem of the pilot valve into
the cavity of the intermediate.
Re-install the gasket (item 20), air
inlet cap (item 8) and capscrews (item
11).
Connect the air supply to the pump.
The pump is now ready for operation.
ACTUATOR PLUNGER SERVICING
27
7
32
31
5
Read these instructions
completely, before in-
stallation and start-up. It
is the responsibility of
the purchaser to retain
this manual for reference. Failure to
comply with the recommendations stated
in this manual will damage the pump, and
void factory warranty.
IMPORTANT