a.
Using retaining ring pliers, remove the retaining ring (28) from the pump.
b.
Using a punch, or some type of sharp instrument, puncture the shaft seal and gently pry it out of the housing.
Remove the old seal from the shaft and discard.
c.
Using an internal hex wrench, remove the four socket head screws (40) which hold the control (42) on the end
cap (4). Remove the control (42) and gasket (39) from the end cap (4). Remove the o-ring (38) from the groove
in the mating surface of the control.
d.
Remove the screws (33), adapter (34), o-rings (32, 35), retaining rings (36) and coupling (37).
e.
Using appropriate wrenches, remove the protective locknut (1) from the maximum flow adjustment screw (11).
f.
Using the proper wrench loosen the four socket head bolts (2) which hold the end cap (4) to the pump housing
(23). Remove two of the bolts opposite each other.
g.
There is an internal loading on the end cap and as the last two screws are loosened, it should begin the separate
from the housing. Loosen the screws alternately until the end cap has separated from the housing, then remove
the screws entirely.
h.
The end cap (4) can now be lifted off the pump. However, be certain that the valve plate (9) does not fall and
become damaged. If the valve plate tends to lift off with the end cap, hold it in plate and remove both parts
together. If the valve plate (9) remains on the bearing plate (14), remove it at this time.
CAUTION
All surfaces exposed are critical and caution must be used to avoid damage. Surface damage
will cause low efficiency or even a totally inoperative pump.
i.
Remove the control cylinder (13) by sliding it off the cylinder rod.
CAUTION
Do not attempt to remove the tube around which the control cylinder was fitted. The tube was
pressed into the end cap during manufacturing is not replaceable.
j.
Remove the valve plate (9) from the end cap (4), if not previously removed. Remove the valve plate locating
pin (7).
k.
Using an internal hex wrench, remove the maximum flow adjustment screw (11) by turning it clockwise through
the end cap. The adjustment screw may be pulled through the cylinder rod once the threaded portion of the
screw has surpassed the threads in the end cap.
l.
Remove and discard the o-ring (12) from the adjustment screw (11).
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