Hitachi SERIES F Throat Packings Fig, Reconnecting the Displacement Pump, Check Valve Adjustment

Service

Throat Packings (Fig. 1)

1.Remove the intake valve and the cylinder (38) as explained in the previous sections.

2.Remove the packing nut/wet-cup (39).

3.Pull the displacement rod (36) out of the bottom of the outlet housing (41).

4.Remove the throat packings and glands from the outlet housing.

5.Clean all parts thoroughly, and inspect them for wear or damage. Replace parts as needed.

NOTE: Always replace the male gland (44) and the bearing (47) when the throat packings are replaced.

6.Install the throat packings into the outlet housing (41) one at a time in the following order, with the lips of the v-packings facing down:

the male gland (44*), two UHMWPE v-packings (45*), one leather v-packing (46*), one UHMWPE v-packing (45*), one leather v-packing (46*), one UHMWPE v-packing (45*), and the bearing (47). Loosely install the packing nut/wet-cup (39).

7.Push the displacement rod (36) up into the outlet housing (41) until it protrudes from the packing nut/wet-cup (39). Continue reassembling the pump in the reverse order of disassembly. Tighten the packing nut/wet-cup just tight enough to prevent leakage.

Reconnecting the Displacement Pump

1.Reinstall the displacement pump on the motor as explained in your separate pump manual.

2.Reconnect the ground wire to the motor.

Check Valve Adjustment

The fluid piston and intake valves are factory-set for high-volume pumping of heavy, spray-viscosity fluids.

For lighter fluids or lower volume requirements, or to reduce surging at the stroke change-over, decrease the travel of the balls (16 and 18). Move the pins (28) to a lower set of holes. See Fig. 1 and refer to the pump disassembly procedure above.

NOTE: If the ball travel is too short for the fluid being pumped, the fluid flow will be restricted.

For heavier fluids or to increase the flow, increase the travel of the balls (16 and 18). Move the pins (28) to a higher set of holes. See Fig. 1 and refer to your pump disassembly procedure above.

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