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Page 2 of 4 66301-XXX (en)
MATERIAL CODE
[CSH] = Ceramic Coated Hard Stainless Steel [PSS] = Hard Chrome Plated Stainless Steel
[CSS] = Ceramic Coated Stainless Steel [SH] = Hard Stainless Steel
[GFT] = Glass lled PTFE [SS] = Stainless Steel
[L] = Leather [T] = PTFE
[PPS] = Polyphenylene Sul de [TC] = Tungsten Carbide
[PSH] = Hard Chrome Plated Hard Stainless Steel [UH] = UHMW-PE
LOWER PUMP DISASSEMBLY
IMPORTANT: The lower pump is designed so that access to
the packings can be accomplished without disassembly of
the inlet / outlet bodies from the main pump tube. Complete
lower pump disassembly should not be necessary, in most
cases skip disassembly steps 3, 4 and 5 below.
NOTE: All threads are right hand.
Secure the lower pump assembly in a vise, clamping on
the (6) outlet body.
Loosen the (1) solvent cup and unscrew the (74) nut and
remove the assembly from the lower pump.
Remove the (8) “O” ring from the (6) outlet body. Set this
assembly aside.
Unscrew the (15) inlet body and remove from the (9)
tube.
Unscrew the (9) tube from the (6) outlet body and re-
move the two (8) “O” rings.
Remove the (26) plunger and components from the (9)
tube. Remove the (6) outlet body from the vise.
Secure the (26) plunger and components in a vise and
unscrew the (33) piston from the plunger.
Remove the (46) washer, (47) bowed washer, (57) male
packing washer, (55 and 56) “V” packings and (54) female
packing washer.
Unscrew the (36) adapter from the (33) piston, releasing
the (28) seat and (27) ball.
Secure the (74) nut in a vise and unscrew the (1) solvent
cup.
Remove the (77) bushing, (44) washer, (50) female pack-
ing washer, (51 and 52) “V” packings, (53) male packing
washer and (43) wave spring.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11
.
Secure the (15) inlet body in a vise and unscrew the (70)
inlet adapter, releasing the (22) seat, (23) “O” ring and (21)
ball.
LOWER PUMP REASSEMBLY
NOTE: Inspect and replace old parts with new parts as neces-
sary. Look for deep scratches on metallic surfaces and nicks
or cuts in “O” rings and packings. Refer to sealant and torque
notes in gure 1.
Secure the (74) nut in a vise and insert the (43) wave
spring, (53) male packing washer, (51 and 52) “V” pack-
ings, (50) female packing washer and (44) washer into
the (74) nut.
Place the (77) bushing into the (1) solvent cup and screw
the (1) solvent cup into the (74) nut. Do not tighten.
Secure the (6) outlet body in a vise and place the (8) “O”
ring at the bottom of the (74) nut and screw into the (6)
outlet body. Tighten the (74) nut to 150 ft lbs. (203.4 Nm).
Slide the (26) plunger rod into the (1) solvent cup and
through the upper packing. Be careful not to damage
the packings.
Assemble the (33) piston by placing the (54) female
packing washer, (55 and 56) “V” packings, (57) male pack-
ing washer, (47) bowed washer and (46) washer onto (33)
piston.
Screw the (33) piston assembly into the (26) plunger
rod and tighten to 20 ft lbs. (27.12 Nm), place the (27)
ball, and (28) seat into the (33) piston and screw the (36)
adapter into place and tighten to 20 ft lbs. (27.12 Nm).
Place the (8) “O” rings at each end of the (9) tube and slide
the (9) tube over the lower piston assembly and screw
into the (6) outlet body. Tighten to 300 ft lbs. (406.8 Nm).
Screw the (15) inlet body onto the (9) tube and tighten
to 300 ft lbs. (406.8 Nm).
Place the (21) ball, (23) “O” ring and (22) seat into the (15)
inlet body and screw the (70) inlet adapter into the (15)
inlet body and tighten to 300 ft lbs. (406.8 Nm).
Tighten the (1) solvent cup.
12.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10
.
PARTS LIST / 66301-XXX
Item Description
(size)
(Qty) Part No. [Mtl] Item Description
(size)
(Qty) Part No. [Mtl]
1 Solvent Cup (1) 94173 [SS]
6 Outlet Body (1) 94169 [SS]
9
8 “O” Ring
(1/16” x 2-1/4” o.d.)
(3) Y328-34 [T]
9
Tube
(66301-XX3)
(1) 94178 [PSS]
(66301-XXB)
(1) 94178-2 [CSS]
15 Inlet Body (1) 94204 [SS]
21
Ball
(1-3/16” o.d.) (66301-X4X)
(1) 90949 [SS]
(66301-X7X)
(1) Y16-138 [SH]
22 Seat (1) 94170 [TC]
9
23 “O” Ring
(1/16” x 1-5/8” o.d.)
(1) Y328-29 [T]
26
Plunger Rod
(66301-XX3)
(1) 90297-1 [PSH]
(66301-XXB)
(1) 90297-2 [CSH]
27 Ball
(11/32” o.d.)
(1) 94210 [TC]
28 Seat (1) 91076 [TC]
33 Piston (1) 94206 [SH]
36 Adapter (1) 94235 [SH]
43 Wave Spring (1) 94138 [SH]
44 Washer (1) 94192 [SS]
46 Washer (1) 94213 [SS]
47 Bowed Washer (1) 90588 [SS]
50 Female Packing Washer (1) 94201-2 [PPS]
9
51
“V” Packing
(66301-3XX, -RXX)
(3) 93687-2 [GFT]
(66301-CXX, -GXX, -PXX)
(3) 93687-4 [UH]
9
52
“V” Packing
(66301-3XX, -PXX)
(2) 93687-2 [GFT]
(66301-CXX, -RXX)
(2) 93687-4 [UH]
(66301-GXX)
(2) 93687-1 [L]
53 Male Packing Washer (1) 94200 [SS]
54 Female Packing Washer (1) 94203-2 [PPS]
9
55
“V” Packing
(66301-3XX, -RXX)
(3) 93688-2 [GFT]
(66301-CXX, -GXX, -PXX)
(3) 93688-4 [UH]
9
56
“V” Packing
(66301-3XX, -RXX)
(2) 93688-2 [GFT]
(66301-CXX, -PXX)
(2) 93688-4 [UH]
(66301-GXX)
(2) 93688-1 [L]
57 Male Packing Washer (1) 94272 [SS]
70 Inlet Adapter (1) 94236 [SS]
74 Nut (1) 94166 [SS]
77 Bushing (1) 94181-2 [PPS]
9
Items included in Service Kit 637306-X43