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INSPECTION AND REPLACEMENT OF
DISCHARGE VALVE
PRESSURE CALIBRATION
See Figure 10
1.
Unscrew discharge valve ball stop (item 10), with spring (item 15) & ring seal (item 17) attached.
2.
Inspect ball stop stem for uneven wear, rough surface or other damage.
3.
Remove discharge ball (item 13). Inspect for any cut, scratches, chips, rust or other damage.
4.
Use a 7/16” allen wrench to unscrew the discharge seat (item 9) from the pump head (item 2).
Clean seat and inspect bevel edge for damage. Also ensure that the seal on the underside of the
seat is intact.
5.
If no obvious damage to the discharge ball and seat, place ball into seat and fill with water. If water
leaks out between ball and seat, they must be replaced.
6.
Replace discharge ball stop, ball and/or seat as required.
7.
Clean and inspect pump head opening, where the discharge seat was installed.
8.
Grease pump head opening and discharge valve ball stop shoulder with multipurpose grease.
9.
Screw discharge seat into pump head and torque to 85 ft-lbs.
10.
Drop discharge ball into discharge seat.
11.
Place spring with small side onto discharge valve ball stop.
12.
Put ring seal over discharge valve ball stop & screw ball stop into the pump head.
Torque to 15 ft-lbs.
A repair kit is available that includes the discharge ball and seat as KIT-1-3100 and one
that includes the discharge ball, seat and ball stop as KIT-2-3100.
DO NOT USE THIS PROCEDURE WITHOUT A TEST GAUGE!
1.
Install a gun, flexible airless hose and glycerin filled test gauge onto unit.
2.
Prime unit.
3.
Turn the control valve knob fully clockwise (maximum pressure setting).
4.
Read the gauge, it should be approximently 2500 PSI.
5.
If maximum pressure is incorrect, remove the black plastic cap from the control valve knob. Insert
a 3/16” allen wrench into the control valve knob set screw, turn clockwise to increase pressure
and counter-clockwise to decrease pressure. Replace black plastic cap.
6.
NEVER set the maximum pressure above 2500 PSI.
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