INSPECTION AND REPLACEMENT OF
CONTROL VALVE, BALL AND SEAT
INSPECTION AND REPLACEMENT OF
SUCTION VALVE
See Figure 10.
1.
Use a wrench to unscrew the control valve (item 14) with ring seal (item 17).
2.
Make sure that the control valve knob turns freely and that its stem is not worn unevenly
, mush-
roomed or otherwise damaged.
3.
Remove TC guide (item 18), verify that it is unbroken, clean and notch side is up.
4.
Remove control ball (item 12). Inspect for any cuts, scratches, chips, rust or other damage.
5.
Use a 7/16” allen wrench to unscrew the control seat (item 11) from the pump head (item 2).
Clean seat and inspect bevel edge for damage. Also ensure that the gasket on the underside of
the seat is intact.
6.
If no obvious damage to the control ball and seat, place ball into seat and fill with water. If water
leaks out between ball and seat, they must be replaced.
7.
Replace control valve, ball, seat and/or TC guide as necessary.
8.
Clean and inspect pump head opening, where the control seat was installed.
9.
Grease pump head opening with multipurpose grease.
10.
Screw control seat into pump head and torque to 85 ft-lbs.
11.
Place TC guide into control seat with notched side up.
12.
Drop control ball into TC guide.
13.
Screw control valve with ring seal into pump head. Torque to 15 ft-lbs.
14.
If a new control valve, ball or seat is installed, complete the Pressure Calibration Procedure.
A repair kit with the control ball and seat is available as KIT-3-3100.
See Figure 10
1.
Remove suction hose assembly from suction seat assembly (item 3) by loosening the hose clamp
2.
Place a small screwdriver into the suction seat assembly and onto the suction valve ball (item 7).
Turn the machine “ON”. The screwdriver should oscillate about 1/16” inch. This indicates that the
bearing assembly and diaphragm are cycling correctly.
3.
If the screwdriver does not oscillate, poke the suction ball to ensure it is not stuck to the suction
seat. If the screwdriver doesn’t start oscillating, troubleshoot diaphragm (Page 19) and bearing
assembly . Otherwise spray light weight oil in the suction seat and onto the suction ball.
Reattach suction hose and test unit.
4.
If unit still fails to operate correctly, remove control head in according instructions on page 19.
5.
Inspect suction ball for any cuts, scratches, chips, rust or other damage. Inspect bevel edge of
suction seat for any damage.
6.
Replace suction seat and/or suction ball as required. However, if the suction seat requires re-
placement it is generally preferable to change the entire control head under the exchange program.
7.
Replace control head as instructed in Inspection and Replacement of Control Head.
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