Hitachi SERIES F - Manual (Page 8)

8 308-043
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.