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Humminbird 777c2 Manual

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7. Refer to Figure R-8. Slide one backup washer over the piston shaft and down into the shaft bore
in the pump back plate. Slide one of the shaft seals over the end of the piston shaft with its flared
side (the side with an embedded o-ring) facing the pump back plate. Slide it down the shaft and
gently work it into the shaft bore. In-stall the second shaft seal in exactly the same way, with its
flared side also facing the pump back plate. Work it into the shaft bore and press both seals in
until the back of the
second seal is about
flush with the top of
the shaft bore.
Next, slide on the
second backup
washer, followed by
the white plastic
piston shaft
bushing. Finally,
slide the piston
installation tool onto
the piston shaft,
small end first, and
use it to push the
backup washers,
piston shaft seals and bushing all the way into the shaft bore, until the outside face of the bushing
is flush with the top of the shaft bore. Remove the piston installation tool. If it was present when
you disassembled the pump, install the thin plastic spacer washer.
8. Press a new wiper block seal into the groove in the center of the wiper block. Squeeze the seal
into an oval and start one edge into the groove. Then work the rest of the seal in until it seats
evenly inside the wiper block bore. Slide the wiper block onto the piston shaft and press it down
into the cavity in the pump back plate. The side of the wiper block from which the seal was
installed should face outward. Slide the black rubber boot onto the piston shaft. Its flat side should
face the pump.
9. Place the assembled pump next to the drive unit and check the alignment of the coupling pin hole
in the end of the piston shaft. Insert an allen wrench or small screwdriver through the coupling pin
hole and use it to rotate the shaft until it will align with the hole in the slider shaft of the drive
assembly. Bring the drive assembly and pump together carefully and, when the holes in the
piston shaft and the slider shaft are aligned, press the coupling pin through the holes and slide the
rubber boot over the coupling pin to hold it in place. Install the four hex nuts on the studs
projecting through the flange on the drive unit and tighten them securely with the 1/2" wrench.
10. Refer to Figure R-1 and install the two high pressure hoses, the seawater intake hose and the
reject brine hoses to the pump assembly. Tighten the hoses clamps on the two reinforced plastic
hoses. This completes the procedure for reassembly of the watermaker. When operation is
commenced again, carefully check for any leaks or other signs of incorrect assembly.
… 6 …


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