Blagdon Pump B75 Servis ve Kullanım Kılavuzu - Sayfa 10

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Pilot Valve Assembly Drawing

PILOT VALVE SERVICING

To service the pilot valve 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 ½" wrench or socket,

remove the four capscrews (items

11) and four flat washers (items 38).

Remove the air inlet cap (item 8) and

air inlet gasket (item 20). The pilot

valve assembly (item 4) can now be

removed for inspection or service.

Step #2: Disassembly of the

pilot valve.

Remove the pilot valve spool

(item 4-E). Wipe clean, and inspect

for dirt, scratches or wear. Replace

the spool if necessary.

Remove the two retaining rings

(items 4-C) from each end of the

pilot valve body.

Remove the two pilot valve bush-

ings (items 4-B), five spacers (items

4-D), and six spool wipers (items

4-F) by pushing gently from other

end of the pilot valve body. Inspect

the wipers for cuts and/or wear.

Replace any wipers as necessary.

520-319-000 Air Operated Double Diaphragm Pump

Step #3: Re-assembly of the

pilot valve.

First install a retaining ring to one

end of the pilot valve. Install one

bushing making sure the step side

faces toward the wiper. Apply a light

coating of grease to the outside

diameter of each wiper. Next, gently

push in the wipers and spacers until

they are against the installed retain-

ing ring and bushing in the opposite

end of the pilot valve body. Install the

remaining bushing making sure the

step side faces the wiper. Install the

remaining retaining ring.

Apply a light coating of grease to

the inner diameter of each wiper.

Also apply a light coating of grease

to the outer diameter of the pilot

valve spool and gently push the

spool through each wiper.

Step #4: Inspect the actuator

plungers.

See ILLUSTRATION AT RIGHT.

The actuator plungers (items 31)

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 27)for cuts and/or wear.

11/01

PILOT VALVE ASSEMBLY PARTS LIST

ITEM

PART NUMBER

B095-096-000

4-A

B095-095-551

4-B

B135-037-506

4-C

B675-057-115

4-D

B770-065-175

4-E

B775-041-506

4-F

B917-003-374

Replace the o-rings if necessary.

Apply a light coating of grease to

each o-ring and re-install the plung-

ers 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 32) by using a flat screwdriver.

NOTE: It is recommended that new

retaining rings be installed.

Step #5: 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), capscrews and

washers (items 11 and 38).

Connect the air supply to the

pump. The pump is now ready for

operation.

DESCRIPTION

QTY

Pilot Valve Assembly

Body, Pilot Valve

Bushing

Ring, Retaining

Spacer

Spool, Pilot

Wiper

IMPORTANT!

Read these instructions completely, before

installation 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

ACTUATOR PLUNGER

SERVICING

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