Service
12
3A5363B
Check Valve Adjustment
This pump has an adjustable piston ball check.
To change the piston ball travel:
1.
Relieve pressure
, page 6.
2.
Loosen nut (5).
3.
Turn the piston valve housing (6)
counterclockwise
to increase
the ball travel and
clockwise to
decrease
the ball travel.
NOTE:
The factory setting is a 0.225” ball travel.
Decreasing the ball travel can minimize surging at
stroke changeover; however, a travel that is too
short restricts the flow and slows down the pump.
4.
Tighten nut (5). Torque to 60 ft-lb (81.35 N•m).
F
IG
. 15
5
6
