Diaphragm And Center Section Repair - Graco Husky 15120 Repair Parts

Repair
Diaphragm and and Center Center Section
Diaphragm Diaphragm and Center
NOTE: NOTE: NOTE: Diaphragm kits are available in a range of
materials and styles. See pages 28 – 29. A Center
Rebuild Kit also is available. See page 23. Parts
included in the Center Rebuild Kit are marked with an
*. For best results, use all kit parts.
Disassemble the the Diaphragm Diaphragm and
Disassemble Disassemble the Diaphragm
Section Section Section
1. Follow the Pressure Relief Procedure, page
2. Remove the manifolds and disassemble
the ball check valves as explained in
Check Valve Repair, page
NOTE: You may wish to remove the inner fluid NOTE: NOTE:
cover bolts (5) as you remove each manifold, for
convenience.
Overmolded Diaphragms Diaphragms ( ( (
3. Overmolded Overmolded Diaphragms
a. Orient the pump so one of the fluid covers
(2) faces up. Use a 17 mm socket wrench to
remove the fluid cover bolts (5, 6), then pull
the fluid cover up off the pump.
b. The exposed diaphragm (12) will screw off by
hand. The shaft will either release and come
off with this diaphragm, or remain attached to
the other diaphragm. If the diaphragm shaft
bolt (14) remains attached to the shaft (108),
remove it. Remove the air side diaphragm
plate (11) and washer (17).
c. Turn the pump over and remove the other
fluid cover. Remove the diaphragm (and the
shaft, if necessary).
d. If the shaft is still attached to either
diaphragm, grasp the diaphragm firmly and
use a wrench on the flats of the shaft to
remove. Also remove the air side diaphragm
plate (11) and washer (17). Continue with
Step 5.
14
Section Repair Repair
Section Repair
and Center Center
and Center
10.
13.
PO models)
PO PO models) models)
4. All All Other All Other Other Diaphragms Diaphragms Diaphragms
a. Orient the pump so one of the fluid covers
faces up. Use a 17 mm socket wrench to
remove the fluid cover screws (5, 6), then pull
the fluid cover (2) up off the pump. Turn the
pump over and remove the other fluid cover.
b. Hold the hex of one fluid side diaphragm
plate (15) with a 1–1/2 socket or box end
wrench. Use another wrench (same size)
on the hex of the other plate to remove.
Then remove all parts of each diaphragm
assembly.
5. Inspect the diaphragm shaft (108) for wear or
scratches. If it is damaged, inspect the bearings
(107) in place. If they are damaged, use a
bearing puller to remove them.
NOTE: NOTE: NOTE: Do Do not Do not not remove remove undamaged remove
6. Use an o-ring pick to remove the u-cup packings
(106) from the center housing. Bearings (107)
can remain in place.
7. If necessary, use a socket wrench to remove the
pilot valves (111).
8. Remove the pilot valve cartridges only if
necessary due to a known or suspected problem.
After removing removing pilot pilot valves,
After After removing pilot
the cartridges (109), then remove cartridge
o-rings (110). If stripped, use two screwdrivers to
screw out the cartridge.
NOTE: NOTE: NOTE: Do Do not Do not remove not remove undamaged remove
cartridges.
cartridges. cartridges.
undamaged bearings. undamaged bearings. bearings.
valves, use a hex to remove
valves,
undamaged pilot undamaged pilot valve pilot valve valve
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