DISASSEMBLY
1.
Before beginning disassembly, run the watermaker and stop it when the piston shaft is at its farthest point of
travel away from the pump (i.e., toward the drive assembly). This provides enough room for sliding the
rubber boot toward the pump in Step
3.
2.
Disconnect the pump from the drive
assembly by first removing the two hex
nuts and 5" sockethead capscrews
from the check valve plate, using the
1/2" open-end wrench and 1/4"
Allen wrench. Also remove the two hex
nuts securing the pump back plate to
the drive assembly. (See
Figure R-1)
.
3.
Slide the black rubber boot on the
piston shaft toward the pump to expose
the drive shaft coupling pin. Use a
small Allen wrench or similar tool to
push the coupling pin out of the drive
shaft (see
Figure 8
). Be aware that the coupling pin fits loosely in the drive shaft and may fall out when the
rubber boot is removed. Be careful not to lose it. Separate the drive assembly from the pump and set the
drive assembly aside.
4.
Remove the two 3" socket-head cap
screws using a 1/4" Allen wrench.
Separate the pump back plate and
piston assembly from the pump body
(see
Figure R-2
).
5.
If the piston assembly remained with
the pump back plate when it was
removed, pull the piston out of the back
plate, and set it aside. If the piston
stayed in the main pump body, pull it
out of the cylinder. If the piston assem-
bly is difficult to remove from the pump
body, insert a small Allen wrench or
Phillips screwdriver through the cou-
pling pin hole. This will provide a “t
-
handle” with a better grip for
extracting the piston assembly.
Be
aware not to damage the surface of
the piston shaft.
6.
Remove the large O-ring (8012588) from its groove in the side of
the pump back plate that faces the pump body. Remove the wiper
block and spacer (if present) from the pump back plate. Use needle-
nosed pliers to pull the old wiper block seal out of the wiper block.
See
Figure R-3
. (
Note:
This seal is usually damaged during removal.
Be sure you have a replacement on hand before removing it.)
