Use and Care Manual
First Choice When Quality Matters
NORTH
AMERICA
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
fi rst 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 fi lm 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.
Plunger Pumps
Operating Instructions and Parts Manual RK Series Pumps
First Choice When Quality Matters
NORTH
AMERICA
Pos. Code Description Qty. Pos. Code Description Qty.
1380120 Shim 0.10 mm 1-3
1380130 Shim 0.20 mm 1-3
1380530 Shim 0.25 mm 1-3
40
1382810 Shim 0.05 mm 1-3
41 1380040 Open bearing support (217 in/lbs) 1
42 740290 O-Ring Ø14x1.78 3
43 1980740 Plug 3/8” G 2
44 1260470 Bolt M8x10 4
1380141 Rail 5/8” 2
Z-Bracket 1-3/4 Rail 1-3/4” 2
45
Z-Bracket Rail 2-5/8” 2
1980740 Plug 3/8” G 1
46
1981180 Plug 3/8” G NP 1
47 180101 O-Ring Ø17.5x2 1
820361 Plug 1/2” G 1
48
960870 Plug 1/2” G NP 1
1381070 Pump head - NP Ø18 1
1381071 Pump head - Brass Ø18 1
1380020 Pump head - Brass Ø20-22 1
49
1380680 Pump head - NP Ø20-22 1
50 820150 Head bolt M8x70 (217 in/lbs) 8
77 840370 Bearing 1
1389270 Complete pump head Ø18 1
1389272 Complete pump head Ø18 H 1
1389271 Complete pump head Ø18 1
1389212 Complete pump head Ø20 H 1
78
1389220 Complete pump head Ø22 H 1
86 1260250 Oil sight glass 1
87 1260430 Snap ring 1
88 1780690 Contrast disc 1
89 1140450 O-Ring Ø20.24x2.62 1
AR64516 Oil 1
OIL CAPACITY - 15 OZ
1 960160 O-Ring Ø17.86x2.62 6
960090 Valve cap - Brass (478 in/lbs) 6
960850 Valve cap - SS (478 in/lbs) 6
1380740 Valve cap - NP (478 in/lbs) 6
960090T Valve cap - 1/4” threaded - Brass (478 in/lbs) 1
2
960850T Valve cap - 1/4” threaded - SS (478 in/lbs) 1
3 1389051 Complete valve 6
4 880830 O-Ring Ø15.54x2.62 6
880581 Plug 1/4” G - Brass 2
5
1380690 Plug 1/4” G NP 2
6 820510 O-Ring Ø10.82x1.78 2
960110 Support ring Ø18 3
840300 Support ring Ø20 3
11
840320 Support ring Ø22 3
880320 High pressure packing Ø18 3
840290 High pressure packing Ø20 3
12
840330 High pressure packing Ø22 3
1380090 Piston guide Ø18 3
1380150 Piston guide Ø20 3
13
1380160 Piston guide Ø22 3
14 961240 O-Ring Ø31.47x1.78 3
880330 Low pressure seal Ø18 3
840280 Low pressure seal Ø20 3
15
840340 Low pressure seal Ø22 3
16 1383130 Oil seal 3
17 850370 Bolt M8x16 (217 in/lbs) 8
18 1380050 Closed bearing support 1
19 640030 O-Ring Ø59.99x2.62 2
20 2280240 Bearing 1
21 1382770 Pump housing 1
22 880130 Vented oil cap 1
23 962010 Nut M8 (106 in/lbs) 3
24 962000 Washer Ø8.1 3
1380940 Ceramic piston Ø18 3
1380930 Ceramic piston Ø20 3
25
1382360 Ceramic piston Ø22 3
26 1380950 Spacer 3
27 600180 O-Ring Ø7.66x1.78 3
28 1380920 Guiding piston 3
29 1380060 Piston pin 3
1383020 Con rod - Bronze > 3000 PSI 3
30
1383050 Con rod - Aluminum < 3000 PSI 3
31 1080401 Back-up ring 3
32 1381850 Washer 8
34 1780510 O-Ring 1
35 1789010 Complete cover 1
36 1343510 Bolt M6x14 (89 in/lbs) 6
2280070 Crankshaft 24mm 1
37
2280060 Crankshaft 24mm 1
38 1380520 Key 1
39 180340 Oil seal 1
Legend
Ø 18 Ø 20 Ø 22
For For For
RK15.15 RK18.20H RK21.20H
RK15.20H RK18.28H
RK15.28H
Over 3600psi