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Plunger Pumps
Operating Instructions and Parts Manual RK Series Pumps
Figure 37
Figure 35
Figure 33
Figure 36
Figure 38
Figure 34
Figure 39
Figure 41
Figure 40
Service Pumps (continued)
5. Squarely seat the
retainer into the head
and push with even
pressure until it snaps
into position. (See Figure
33)
Servicing the Plungers
If the plungers are not damaged they
do not need any servicing.
Tools required: 16mm socket, ratchet,
mechanics pick, taper blade gasket
scraper, thread sealant and torque
wrench.
NOTE: Be very careful when working
with the plungers, they are made from
ceramic which is brittle and can be
damaged.
Any time you remove a plunger it is
recommended you replace the slinger
washer, O-ring and top plunger washer.
The washers are a cushion for the
ceramic plunger and compress when
first used and the O-ring will take a
set to create a seal and usually will not
spring back to its original shape. By not
replacing these parts you run the risk of
breaking a plunger or having a
water leak.
Disassembly:
1. Remove the plunger
retainer nut. (See
Figure 34)
2. Insert the gasket scraper
between the copper
washer and plunger to
remove the washer. (See
Figure 35)
3. Twist and pull the plunger
off the plunger rod.
4. Remove the plunger
rod O-ring seal and split
back-up ring with the
mechanics pick. (See Figure
36 & 37)
5. Remove brass slinger.
At this point clean any
thread locker that is
left on the plunger
rod and retaining nut
threads. (See Figure
38)
Assembly:
1. Install the slinger
washer. (See Figure
39)
2. Install the plunger
rod O-ring and split
back-up ring. Place a
light film of oil on the O-
ring and back-up ring.
(See Figure 40)
NOTE: The O-ring is
closest to the threaded
end of the rod.
3. Install the plunger by
pushing straight down
and twisting slightly
in either direction
(See Figure 41)
(NOTE: Be sure that
the back-up ring is fully
seated). Make sure you fully seat
the plunger.