High Pressure Plunger Pump · Frame size 36 PFR 3621X

Name: 3621X
Brand: CAT PUMPS
SKU: 3621X

This triplex (three plunger rods) positive displacement, reciprocating plunger pump is part of the Cat Pumps X-Series , engineered for maximum life in demanding applications such as seawater reverse osmosis (SWRO). The model 3621X features a 316 stainless steel inlet manifold, duplex stainless steel discharge manifold, 316 stainless steel valve assemblies, solid ceramic plungers, and standard NBR (Buna-N) low-pressure seals and O-rings.

Request this pump Data sheet (PDF) Spare parts

Technical specifications

Flow rate	94.6 l/min
Operating pressure	138 bar
Speed	870 min⁻¹
Inlet port	1 1/2" NPT(F)
Discharge port	1" NPT(F)
Shaft diameter	35 mm
Material	Stainless Steel

Downloads

CAD files

Spare parts

Click an item in the drawing or in the parts list to add it to your request list. We turn it into a quotation – no order is placed.

3 kits bundle wearing parts of this pump ↓

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Parts list

Item	Part no.	Description	Qty
5	96049	Screw, HHC Sems (M10x25)S	8
8	134604	Cover, Bearing [06/18]ALE	2
9	815279	Shim, Split, 2-Piece 0 - 2FBR	2
10	12398	O-Ring, Bearing Cover - 70DNBR	2
11	13296	Seal, Oil, Crankshaft 0 - 2NBR	2
12	855049	Shim, Split, 2-Piece 0 - 2S
15	29326	Bearing, RollerSTL	2
20	126725	Rod, Connecting Assembly (Includes: 21, 22, 23) (Model 3521DHS)BZ	3
21	126749	Washer, Locking (M10)STCP	3
22	126593	Washer, Flat (M10.5)STCP	6
23	122045	Screw, HH (M10x55)STZP	6
25	29325	Crankshaft, Dual End (M48)FCM	1
31	828710	Protector, Oil Cap with Foam Gasket 1PE	1
32	43211	Cap, Oil FillerABS	1
33	14177	O-Ring, Oil Filler Cap - 70DNBR	1
34	126743	Bolt, Eye (M12x1.75) (For Lifting Pump Only)STCP	1
37	92241	Gauge, Oil, Bubble with Gasket - 80D 1 - 2PC	1
38	44428	Gasket, Flat, Oil Gauge - 80DNBR	1
40	125753	Screw, HHC, Sems (M8 x 25) (Model 2530E)S	8
48	25625	Plug, Drain (1/4" x 19 BSP[M])STCP	1
49	23170	O-Ring, Drain Plug - 70DNBR	1
50	45936	Cover, Rear (See Tech Bulltin 118)ALE	1
51	16612	O-Ring, Cover - 70DNBR	1
53	134784	Crankcase Assembly (Includes 54)ALE	1
54	27488	Pin, GuideS	2
56	27790	Pan, OilPOP	1
59	92538	Screw, HHC, Sems (M6 x 16) (Model 2530E)S	2
64	43864	Pin, CrossheadCM	3
65	49166	Rod, Plunger (Model 3521DHS)SSHB	3
69	126587	Washer, Oil SealSTCP	3
70	100488	Seal, Oil, CrankcaseNBRS	3
75	43865	Slinger, BarrierS	3
88	45676	Washer, Keyhole (M16)S	3
90	43957	Plunger (M32x145)CC	3
95	89778	Stud, Plunger Retainer (M10x135)SS	3
96	20189	Back-up-Ring, Plunger RetainerPTFE	3
97	11345	O-Ring, Plunger Retainer - 70DNBR	3
98	44085	Gasket, Plunger Retainer (M7) Model 3501, 3501C, Gasket, Plunger Retainer (M10) Model 3511, 3511CSS	3
99	44084	Retainer, Plunger (M10)SS	3
100	44119	Retainer, Seal, RearPPG	3
100	814279	Retainer, Seal, 2-PiecePPG	3
101	44106	Wick, Long Tab	3
104	43875	O-Ring, Inlet Adapter - 70DNBR	3
105	45562	Adapter, Inlet, Low-PressureSS	3
106	44098	Seal, Low-Pressure, with SS - SpringNBR	3
106	76298	Seal, Low-Pressure, with SS-Spring	3
107	44101	Washer, Low-Pressure SealSS	3
110	77365	Manifold, InletSS	1
112	11379	O-Ring, Inlet Manifold - 70DNBR	3
117	44585	Screw, HSH (M14x40)S	4
122	665435	SpacerSS	3
123	12391	O-Ring, V-Packing Cylinder - 70DNBR	3
124	670197	Cylinder, PackingSS	3
126	665431	Backup Ring, PackingPVDF	3
127	670333	Packing, SquarePFB	3
128	670196	Washer, SpringSS	3
129	670195	Sleeve, PlungerD	3
141	49743	Spring, Coil, LargeSS	3
155	48860	O-Ring, V-Packing Cylinder - 90DNBR	3
156	48362	Backup Ring, V-Packing, Spacer, OuterD	6
162	48363	Backup-Ring, Valve SeatD	6
163	26142	O-Ring, Seat - 80DNBR	6
164	44612	Seat, SteppedSS	6
166	44108	ValveSS	6
167	44109	Spring, ValveSS	6
168	44728	Retainer, SpringPVDF	6
170	44729	Washer, Spring RetainerSS	6
170	44729	Washer, Spring RetainerPVDF	6
171	44644	Coil Spring (70kg), Valve PlugSS	6
172	89827	O-Ring, Valve Plug - 90DNBR	6
173	48364	Backup-Ring, Valve PlugD	12
174	670143	Plug, ValveSS	6
176	129759	Plate, ValveSSD	2
177	32393	Screw, HSH (M14 x 70)STZF	8
185	129754	Manifold, DischargeSSD	1
188	89981	Screw, HSH (M12 x 70)S	8
250	855042	Protector, Shaft with Two (2) Screws, Lockwashers and WashersPOP	1
–	6124	Gasket, Liquid (3 oz. / 0,1 l)	1
–	6139	Lubricant, Anti-Seize (8 oz) (Model 1531)	1
–	30696	Reverse Pliers (Not Shown)	1
–	32273	Crankcase Oil Seal Removal and Installation Kit (Not Shown)	1
–	34021	Key (M10 x 8 x 70) 1	1
–	34039	Mount, Direct (S) 1	1
–	34314	Kit, Oil Drain (3/8" x 48") (Not Shown)	1
–	76514	Mount, Rail Assembly (S) (Includes: 34039) 1	1
–	80540	Screw, Adjusting (M12 x 100) 2	2
–	910620	Head Complete with NBR & PFB Seals, NBR O-Rings (Model 3621X)	1
–	910621	Head Complete with ST2 & PFB Seals, NBR O-Rings (Model 3621XD)	1
–	990013	Hub, "B", 35 mm (STL) 1	1
–	6133	Oil, Crankcase, Can 4l	1

in the request list covered by a requested kit

Seal and valve kits

A kit bundles the wearing parts of one assembly. Selecting it highlights the items it covers in the drawing and the parts list – once requested, they stay marked.

Seal kits

Seal kit

32522

NBR (STD)Medium Nitrile (Buna-N)

contains 10 items · one kit per pump
Parts list
- 97 11345 O-Ring, Plunger Retainer - 70D 3×
- 104 43875 O-Ring, Inlet Adapter - 70D 3×
- 106 44098 Seal, Low-Pressure, with SS - Spring 3×
- 112 11379 O-Ring, Inlet Manifold - 70D 3×
- 123 12391 O-Ring, V-Packing Cylinder - 70D 3×
- 126 665431 Backup Ring, Packing 3×
- 127 670333 Packing, Square 3×
- 129 670195 Sleeve, Plunger 3×
- 155 48860 O-Ring, V-Packing Cylinder - 90D 3×
- 156 48362 Backup Ring, V-Packing, Spacer, Outer 6×
Seal kit

77077

NBR (STD)Medium Nitrile (Buna-N)

contains 10 items · one kit per pump
Parts list
- 97 11345 O-Ring, Plunger Retainer - 70D 3×
- 104 43875 O-Ring, Inlet Adapter - 70D 3×
- 106 76298 Seal, Low-Pressure, with SS-Spring 3×
- 112 11379 O-Ring, Inlet Manifold - 70D 3×
- 123 12391 O-Ring, V-Packing Cylinder - 70D 3×
- 126 665431 Backup Ring, Packing 3×
- 127 670333 Packing, Square 3×
- 129 670195 Sleeve, Plunger 3×
- 155 48362 Backup Ring, V-Packing, Spacer, Outer 3×
- 156 48860 O-Ring, V-Packing Cylinder - 90D 6×

Valve kits

Valve kit

77078

NBR (STD)Medium Nitrile (Buna-N)

contains 9 items · 2 kits per pump
Parts list
- 162 48363 Backup-Ring, Valve Seat 3×
- 163 26142 O-Ring, Seat - 80D 3×
- 164 44612 Seat, Stepped 3×
- 166 44108 Valve 3×
- 167 44109 Spring, Valve 3×
- 168 44728 Retainer, Spring 3×
- 170 44729 Washer, Spring Retainer 3×
- 172 89827 O-Ring, Valve Plug - 90D 3×
- 173 48364 Backup-Ring, Valve Plug 6×