Graco Twistork Helix 308345T, Instructions - Parts Manual

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Maintenance
14 308345T
Correct a Bad Suction Line Seal
Air that is pulled into the suction line makes the pump
inefficient. This can happen for the following reasons:
• Cavitation is occurring because the pump or helix
is
going too fast.
• Siphon hose connection is leaking.
• Nylon rings (22) are not sealing. See F
IG
. 9.
To correct the problem (see F
IG
. 9):
1. Torque the four socket-head screws (24) in the
siphon fitting (5) oppositely and evenly to 80 to 100
in-lbs (9.0 to 11.3 N•m).
NOTE: If Step 1 does not correct the problem,
continue with Steps 2 through 5.
2. Replace the rings (22). Make sure the outer lips face
up, as shown in F
IG
. 9.
3. Insert the inlet tube (4) into the bottom of the siphon
fitting (5).
4. Tap the bottom of the inlet tube (4) to make sure the
tube passes through the rings (22) and seats on the
siphon fitting (5).
5. Torque the four socket-head screws (24) in the
siphon fitting (5) oppositely and evenly to 80 to 100
in-lbs (9.0 to 11.3 N•m).
F
IG
. 9: Correct a Bad Suction Line
Torque screws oppositely and evenly to 80 to 100 in-lbs (9.0 to 11.3 N•m).
1
2
Install with outer lips facing up.
5
24
1
22
2
4