Graco Husky 3300, Запасные части

Страница: 19 / 42

Repair
3A0411A 19
Attach Second Fluid Cover
To ensure proper seating and help attain expected dia-
phragm life, attach the second fluid cover with air pres-
sure on the pump. This procedure is needed for
overmolded diaphragms (
PO and CO ) and for the fol-
lowing standard diaphragms: TP, SN, GE, PT .
1. Place the supplied tool (302) where the air valve
gasket (113*) normally goes. Arrows (A) must face
toward the fluid cover that is already attached.
2. Reattach the air valve.
3. Supply the pump with low pressure air, just enough
to move the diaphragm. For standard diaphragms,
use about 10 psi (0.07 MPa, 0.7 bar); for over-
molded diaphragms use about 20 psi (0.14 MPa,
1.4 bar). Shop air may be used. The diaphragm will
shift so the second fluid cover will seat properly.
Keep air pressure on until the second fluid cover is
attached.
4. Attach the second fluid cover (2). See Torque
Instructions, page 20.
5. Remove the air valve and the tool (302), replace the
gasket (113), and reattach the air valve. See
Torque Instructions, page 20.
NOTE: If you are replacing the diaphragms but not the
air valve, you still must remove the air valve, and
replace the gasket with the tool so the air valve can be
used for proper installation of the second fluid cover.
Remember to remove the tool and replace the gasket
when finished.
Reassembly of Overmolded Diaphragms
NOTE: If your pump has standard diaphragms, see
page 16.
1. Clamp the shaft flats in a vise.
2. If diaphragm setscrew comes loose or is replaced,
apply permanent (red) Loctite
®
or equivalent to dia-
phragm side threads. Screw into diaphragm until
tight.
3. Assemble the air side plate (14) and washer (18)
onto the diaphragm. The rounded side of the plate
must face the diaphragm.
4. Apply medium-strength (blue) Loctite or equivalent
to the threads of the diaphragm assembly. Screw
the assembly into the shaft as tight as possible by
hand.
5. Grease the shaft u-cups (101*) and the length and
ends of the diaphragm shaft (108*). Slide the shaft
into the housing.
6. Reattach the first fluid cover (2). Arrow (A) must
point toward the air valve. See Torque Instruc-
tions, page 20.
7. Repeat Steps 2 - 4 for the other diaphragm assem-
bly.
8. Follow directions under Attach Second Fluid
Cover , page 19.
9. Reassemble the ball check valves and manifolds as
explained on page 12.
To reduce the risk of serious injury, do not put your fin-
gers or hand between the air cover and the diaphragm.
F
IG
. 7. Diaphragm Installation Tool
302
A
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