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Pump Charge Check Valve Service (Fig. 22)
1. Remove check valve plug with a 1/4 in. internal hex
wrench.
2. Remove valve spring and check ball from pump end
cap.
IMPORTANT: Do not allow check balls to fall into
closed loop passages in end cap.
3. Inspect check balls and mating seats in end cap for
damage or foreign material.
4. Lay pump on its side and reinstall check ball, spring
and plug (with O-ring) into end cap. Make sure check
ball does not fall into closed loop passage inside pump.
Tighten plug to a torque of 15 to 35 ft-lb. Turn pump over
and repeat installation procedure for other check valve.
2
4
1
installed in machine
3
5
15 to 35 ft-lb.
Top of pump when
Torque to
Figure 22
1. Check valve plug
2. O-ring
3. Check valve spring
4. Check ball
5. Pump end cap
Pump Bypass Valve Service (Fig. 23)
1. Unscrew bypass valve from end cap of pump.
2. Inspect valve and mating seat in end cap for damage
and foreign material. It is recommended that the O-ring
and back-up ring be replaced.
3. Reinstall bypass valve into end cap. Tighten to a
torque of 7 to 10 ft-lb.
1
4
installed in machine
3
2
7 to 10 ft-lb.
Top of pump whenTorque to
Figure 23
1. Bypass valve
2. Back-up ring
3. O-ring
4. Pump end cap
Hydroject 3010 Page 4 - 17 Repairs