Check Valve Repair - Graco Husky 3300 Repair Parts

Repair

Check Valve Repair

NOTE: Kits are available for new check valve balls and
seats in a range of materials. See page 34 to order kits
in the material(s) desired. O-ring and fastener kits also
are available.
NOTE: To ensure proper seating of the check balls,
always replace the seats when replacing the balls. Also,
on models with seat o-rings, replace the o-rings every
time the manifold is removed.
Disassembly
1. Follow the Pressure Relief Procedure on page 10.
Disconnect all hoses.
NOTE: The pump is heavy. Always use two people or a
lift to move it.
2. Remove the pump from its mounting.
NOTE: For plastic pumps (3300P), use hand tools
until thread-locking adhesive patch releases.
3. Use a 3/4 in. (19 mm) socket wrench to remove the
outlet elbow fasteners (8), then remove the manifold
assembly. See F . 3.
IG
4. Remove the o-rings (13, not used on some models),
seats (11), and balls (12).
5. Turn the pump over and remove the inlet manifold.
The mounting brackets will remain attached.
6. Remove the o-rings (13, not used on some models),
seats (11), and balls (12).
12
Reassembly
1. Clean all parts and inspect for wear or damage.
Replace parts as needed.
2. Reassemble in the reverse order, following all notes
in F . 3. Put the inlet manifold on first. Be sure the
IG
ball checks (11-13) and manifolds are assembled
exactly as shown. The arrows (A) on the fluid cov-
ers must point toward the outlet manifold.
3A0411A