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Page 2 of 4 6737X-XXX (en)
MATERIAL CODE
[B] = Nitrile [SS] = Stainless Steel
[C] = Carbon Steel [T] = PTFE
[Ny] = Nylon [TC] = Tungsten Carbide
[PSH] = Hard Chrome Plated Hardened Stainless Steel [UH] = UHMW-PE
[PSS] = Hard Chrome Plated Stainless Steel [V] = Viton®
[SH] = Hardened Stainless Steel
LOWER PUMP DISASSEMBLY
NOTE: All threads are right hand.
Unscrew and remove three (12) nuts from (10) connecting rods.
Remove (15) inlet body and components from (9) tube.
Remove three (62) cap screws, releasing (24) plate, (22) ball seat
and components.
Remove two (49) cap screws and (20) ball stop, releasing (21) ball.
Pull (9) tube and (26) plunger from (6) outlet body.
Push (26) and components out lower end of (9) tube.
Unscrew (36) seat body and remove (29) gasket, (27) ball and
(28) ball seat. NOTE: (36) seat body has four 1/4” dia. x 3/16”
deep holes. Use a spanner wrench to loosen.
Remove (40) retaining ring from (36) seat body.
Remove (8) “O” ring from (6) outlet body.
Unscrew (1) solvent cup from (6) outlet body. NOTE: (1) solvent
cup has six 3/8” dia. x 5/16” deep holes. Use a rod or spanner
wrench to loosen.
Remove (45) retaining washer, releasing (75) packing set or (44)
wavy spring washer, (53) male packing washer, (51 and 52) “V”
packings and (50) washer.
LOWER PUMP REASSEMBLY
NOTE: All threads are right hand.
Models 6737X-CXX, -LXX, -PXX, -RXX: Assemble (50) washer,
(52 and 51) “V” packings, (53) male packing washer and (44)
wavy spring washer into (1) solvent cup.
Models 6737X-KXX: Assemble (75) packing set into (1) solvent
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
1.
cup.
2. Assemble (45) retaining washer into (6) outlet body and screw
(1) solvent cup and components into (6) outlet body. NOTE: Do
not tighten.
3. Lubricate and assemble (8) “O” ring to groove in (6) outlet body.
4. Lubricate (26) plunger and upper packings with Wet-Sol “Plus”.
Carefully slide (6) outlet body, (1) solvent cup and components
over the top of (26) plunger. Retain (6) outlet body in a bench
vise and tighten (1) solvent cup. Carefully lay assembled parts
aside for future assembly.
5. Assemble (76) packing set or (72) wiper and (71) “W” packing
onto (36) seat body.
6. Assemble (40) retaining ring on (36) seat body and lay aside for
future assembly.
7. Lubricate and assemble (8) “O” ring to groove in (15) inlet body.
8. Assemble four (19) ball guides to (22) ball seat.
9. Assemble (21) ball and (20) ball stop, retaining with two (49)
cap screws.
10. Assemble (23) “O” rings to grooves in (22) ball seat and assem-
ble (22) ball seat into (15) inlet body.
11. Assemble (24) plate to (15) inlet body, securing with three (62)
cap screws. NOTE: Tighten (62) cap screws to 295 - 305 ft lbs
(400.0 - 413.5 Nm).
12. Place (26) plunger, (6) outlet body and (1) solvent cup upside
down in a vise, clamping on ats of (26) plunger at (solvent cup
end. NOTE: (26) plunger to be vertical.
13. Place (27) ball into end of (26) plunger. Place (29) gasket on
sealing surface above ball guide. Apply Loctite 242 to threads
of (26) plunger. Place (28) ball seat, bevel side toward (27) ball,
into (36) seat body and assemble (36) and components to (26)
plunger. NOTE: Tighten (36) seat body to 100 - 110 ft lbs (135.6
- 149.1 Nm).
14. The lip of (72) wiper is to be rolled inward using a at surfacxe
with no sharp edges (such as a steel dowel) to prevent dam-
age to wiper, plus easier assembly. This process may have to be
PARTS LIST
Item Description
(size)
(Qty) Part No. Mtl
1
Solvent Cup
(models 6737X-X3X, -X6X, -XCX, -XDX)
(1) 67369 [SS]
(models 6737X-X8X, -XEX, -XFX, -XGX)
(1) 66730 [SS]
6 Outlet Body (1) 96436 [SS]
8
“O” Ring
(0.103” x 3.365” o.d.)
(models 6737X-KXX)
(2) 93333 [B]
(models 6737X-CXX, -LXX, -PXX, -RXX)
(2) 92619 [T]
9
Tube
(models 67371-XXX)
(1) 92599-1 [SH]
(models 67372-XXX)
(1) 79164 [SS]
10 Connecting Rod (3) 79156 [SS]
12 Nut
(1” - 14)
(3) 79184 [SS]
15 Inlet Body (1) 96437 [C]
19 Ball Guide (4) 96435 [SS]
20 Ball Stop (1) 96434 [SS]
21 Ball
(3.000” dia.)
(1) 96783 [SH]
22 Ball Seat (1) 96433 [SS]
23 “O” Ring
(3/16” x 5” o.d.)
(2) Y327-350 [V]
24 Plate (1) 96438 [C]
26
Plunger
(models 6737X-XXD)
(1) 67204 [PSH]
(models 6737X-XXF)
(1) 67205 [PSS]
27
Ball
(1.000” dia.)(models 67371-XXX)
(1) Y16-132 [SH]
(models 67372-XXX)
(1) 90948 [SS]
28
Ball Seat
(models 67371-X3X, -X6X, -X8X, -XEX)
(1) 92610 [SH]
(models 67372-X3X, -X6X, -X8X, -XEX)
(1) 77430 [SS]
(models 6737X-XCX, -XDX, -XFX, -XGX)
(1) 95770 [TC]
Item Description
(size)
(Qty) Part No. Mtl
29 Gasket (1) 92612 [SS]
36 Seat Body (1) 93234 [SS]
40 Retaining Ring (1) 93225 [SS]
44 Wavy Spring Washer
(models 6737X-X6X,
-XDX, -XEX, -XGX)
(1) 79175 [SH]
45 Retaining Washer (1) 93041 [Ny]
49 Cap Screw
(1/4” - 20 x 1”)
(2) Y6-45-T [SS]
50
Washer
(models 6737X-CXX, -PXX)
(1) 93756-4 [UH]
(models 6737X-LXX, -RXX)
(1) 93756-5 [T]
51
“V” Packing
(models 6737X-CXX, -PXX)
(2) 93683-4 [UH]
(models 6737X-LXX, -RXX)
(2) 93683-5 [T]
52
“V” Packing
(models 6737X-CXX, -RXX)
(2) 93683-4 [UH]
(models 6737X-LXX, -PXX)
(2) 93683-5 [T]
53 Male Packing Washer
(models 6737X-CXX,
-LXX, -PXX, -RXX)
(1) 92602 [SS]
62 Cap Screw
(1” - 14 x 3”)
(3) 96447 [SS]
71
“W” Packing
(models 6737X-CXX, -PXX)
(1) 93758-4 [UH]
(models 6737X-LXX, -RXX)
(1) 93758-5 [T]
72
Wiper
(models 6737X-CXX, -PXX)
(1) 93757-4 [UH]
(models 6737X-LXX, -RXX)
(1) 93757-5 [T]
75 Packing Set
(models 6737X-KXX)
(1) 93568-1 [T]
76
Packing Set
(models 6737X-KXX)
(1) 93567-1 [T]
88 Valve (1) 62113 [SS]
Items included in Service Kit 637444-XXD
(continued on page 4)