Check Valves - Graco Python A25177 Instructions Manual

pushed down to the hard stop so that the set screws
(10) engage the groove.
6. Reinstall and tighten the three set screws (10) to
hold the air piston cylinder (8) in place.
7. Tighten the packing nut (16) to a torque of 15 in-lbs
(1.7 N•m), then loosen and tighten again it to a final
torque of 5 in-lbs (0.6 N•m).
NOTE: If a torque wrench is not present in the field, an
alternative method is to tighten the nut finger tight
through the window, then use a small punch or hex
wrench to further tighten by approximately 10 degrees.
F . 16 Tighten packing nut
IG
NOTE: If the packing nut (16) is over-tightened, the
pump may not complete a full stroke and seal life will be
compromised.
3A4386C

Check Valves

Inlet Check Valve Repair (all models except
PCI-xxx-xxH)
1. Follow the Pressure Relief Procedure, page 17.
2. Remove the inlet check valve assembly (17).
16
F . 17 Inlet check valve assembly
IG
3. Remove the retaining nut (17a) and piston (17b).
4. Remove the piston o-ring (17c).
5. Inspect parts for wear, replace as needed.
6. Install the piston o-ring (17c), piston (17b), and
retaining nut (17a).
7. Reconnect the inlet check valve assembly (17).
Repair
17a
17b
17c
17
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