Graco 234124 - Page 18

18 308479
Service
Ball Check Valve Repair
Tools Required
D Torque wrench
D 10 mm socket wrench
D O-ring pick
Disassembly
NOTE: A Fluid Section Repair Kit is available. Refer to
page 25 to order the correct kit for your pump. Parts
included in the kit are marked with an asterisk, for
example (201*). Use all the parts in the kit for the best
results.
NOTE: To ensure proper seating of the balls (301),
always replace the seats (201) when replacing the
balls. Also, on some models, replace the o-rings (202).
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 11.
1. Relieve the pressure. Disconnect all hoses.
2. Remove the pump from its mounting.
3. Using a 10 mm socket wrench, remove the four
bolts (106) and nuts (114, used on stainless steel
pumps only) holding the outlet manifold (103) to
the fluid covers (101). See Fig. 12.
4. Remove the o-rings (202, not used on some
models), seats (201), and balls (301) from the
manifold (103).
5. Turn the pump over and remove the inlet manifold
(102). Remove the o-rings (202, not used on some
models), seats (201), and balls (301) from the fluid
covers (101).
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 Fig. 12. Be sure the ball checks and
manifolds are assembled exactly as shown. The
arrows (A) on the fluid covers (101) must point
toward the outlet manifold (103).
02647C
Fig. 12
1
3
2
Apply medium-strength (blue) LoctiteR or equivalent to the
threads, and torque to 120–150 in-lb (14–17 N.m).
Beveled seating surface must face the ball (301).
Arrow (A) must point toward outlet manifold (103).
4
Not used on some models.
106
103
101
A
201*
301*
106
102
201*
301*
2
1
1
202*
202*
4
4
3
3
Aluminum Model Shown