Ball Check Valves - Graco herkules 338 Instructions Manual

CAUTION
Do not over-torque the manifold bolts (104). Doing
so may cause the nuts (106) to spin in the hous-
ings, damaging the cover (101).

Ball Check Valves

Tools Required
D Torque wrench
D 1/2" (13 mm) socket wrench
D O-ring pick
NOTE: A Fluid Section Repair Kit is available. Parts
included in the kit are marked with an asterisk, for
example (301*). Use all the parts in the kit for the best
results. Always replace the o-rings (108) with new
ones whenever the old ones are removed.
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 9.
1. Relieve the pressure. Disconnect all hoses.
Remove the pump from its mounting.
2. Using a 1/2" socket wrench, remove the nuts (106)
holding the top manifold (102) to the covers (101).
Lift the manifold off the pump. See Fig. 10.
3. Remove the outer o-ring (108), ball guide (202),
ball (301), seat (201), and inner o-ring (108) from
each of the covers.
4. Turn the pump over. Pull the tie rods (104) out of
the pump, leaving the four nuts (106) on the rods.
Remove the feet (107) and lower manifold (102).
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Service
5. Remove the outer o-ring (108), seat (201), ball
(301), ball guide (202), and inner o-ring (108) from
each of the covers (101).
6. Clean all parts and inspect for wear or damage.
Replace parts as needed.
7. Reassemble the intake ball checks in the bottom of
the pump, following all notes in Fig. 10. Be sure
the ball checks are assembled exactly as shown.
8. Set the lower manifold (102) and feet (107) in
place on the bottom of the pump.
9. Insert the long threads of each rod (104) through
the feet and lower manifold. Push the rods up
through the covers (101) until the nut (106) on the
end of the rods bottoms on the foot. Make sure the
rods are pushed all the way through. Turn the
pump upright (the rods are a slight interference fit
and will hold the pump parts securely in place).
10. Reassemble the outlet ball checks in the top of the
pump, following all notes in Fig. 10. Be sure the
ball checks are assembled exactly as shown. To
avoid leaks, run your finger over the o-rings (108)
to ensure that they are properly seated.
11. Install the top manifold (102) and four nuts (106).
Torque to 50 to 60 in-lb (5.6 to 6.8 N-m). Do not
over-torque. See Torque Sequence, page 26.