High Pressure Plunger Pump · Frame size 38 PFR 3821HS

Name: 3821HS
Brand: CAT PUMPS
SKU: 3821HS

This triplex (three plunger rods) positive displacement, reciprocating plunger pump is constructed with 316 stainless steel manifolds, 316 stainless steel valve assemblies, solid ceramic plungers and standard NBR (Buna-N) seals and O-rings.

Request this pump Data sheet (PDF) Spare parts

Technical specifications

Flow rate	76 l/min
Operating pressure	160 bar
Speed	700 min⁻¹
Inlet port	1 1/2" NPT
Discharge port	1" NPT
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.

6 kits bundle wearing parts of this pump ↓

Skip the drawing, go to the parts list

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	4
10	12398	O-Ring, Bearing Cover - 70DNBR	2
11	13296	Seal, Oil, Crankshaft 0 - 2NBR	2
12	855049	Shim, Split, 2-Piece 0 - 2S	0-2
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	814279	Retainer, Seal, 2-PiecePVDF	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
107	44101	Washer, Low-Pressure SealSS	3
110	701286	Manifold, Inlet, Block-StyleSS	1
111	701116	Plug, Inlet [1-1/2" NPT(M)]SS	1
112	701794	O-Ring, Inlet Spacer - 70DNBR	6
113	701319	Backup Ring, Inlet SpacerPTFE	6
114	701317	Spacer, InletSS	3
117	701252	Screw, HSH (M14 x 100)SS	4
118	701077	Plug, [1/4" NPT(M)]SS	3
122	49782	Spacer, V-PackingSS	3
123	12391	O-Ring, V-Packing Cylinder - 70DNBR	3
124	49783	Cylinder, V-PackingSS	3
126	48390	Adapter, FemaleD	3
127	44608	V-PackingSTG	6
128	45565	Adapter, MaleSS	3
141	49743	Spring, Coil, LargeSS	3
158	48362	Backup Ring, V-Packing, Spacer, OuterD	3
159	48860	O-Ring, V-Packing Cylinder - 90DNBR	3
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
171	44644	Coil Spring (70kg), Valve PlugSS	6
172	89827	O-Ring, Valve Plug - 90DNBR	6
173	48364	Backup-Ring, Valve PlugD	6
174	701278	Plug, ValveSS	6
176	701316	Cover, ValveSS	2
177	87951	Screw, HSH (M10x30)S	32
185	701315	Manifold, DischargeSS	1
188	701279	Screw, HSH (M12 x 100), LowerS	12
196	701342	Plug, Discharge (1" NPT) Not ShownSS	1
250	855042	Protector, Shaft with Two (2) Screws, Lockwashers and WashersNY	1
–	6124	Gasket, Liquid (3 oz. / 0,1 l)	1
–	6139	Lubricant, Anti-Seize (8 oz) (Model 1531)	1
–	30278	Oiler (1 oz) (Not Shown) 3	1
–	30696	Reverse Pliers (Not Shown)	1
–	30742	Passfeder, M10 x 8 x 70	1
–	32273	Crankcase Oil Seal Removal and Installation Kit (Not Shown)	1
–	34039	Mount, Direct (S) 1	1
–	34314	Kit, Oil Drain (3/8" x 48") (Not Shown)	1
–	80540	Screw, Adjusting (M12 x 100) 2	1
–	126611	Mount, Rail Assembly (STZP R)	1
–	701408	Manifold, Inlet, Flushed (Models 3801KHS, 3811KHS)SS	1
–	819000	Assembly, Crankcase, Cast Iron Conversion (Not Shown) 1	1
–	901401	Head, Complete, with NBR Seals and O-Rings (Model 3821HS)	1
–	901405	Head, Complete, Flushed with NBR Seals and O-Rings	1
–	990663	Assembly, Flushing, 5 Gal, 115V, 1.1 Amp, 1/2" NPT (Model 6821K) 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

701699

NBR (STD)Medium Nitrile (Buna-N)

contains 9 items · one kit per pump
Parts list
- 97 11345 O-Ring, Plungerhalter 3×
- 104 43875 O-Ring, Adapter 3×
- 106 44098 Dichtung, Niederdruck 3×
- 112 701794 O-Ring, Saugstutzen 6×
- 113 701319 Stützring, Saugstutzen 6×
- 123 12391 O-Ring, V-Packung, Zylinder 3×
- 127 44608 V-Packung 6×
- 158 48362 Stützring, V-Packung, Zylinder 3×
- 159 48860 O-Ring, V-Packung, Zylinder 3×
Seal kit

33269

FPM (0.0110)Fluorocarbon

contains 9 items · one kit per pump
Parts list
- 97 11375 O-Ring, Plungerhalter 3×
- 104 44826 O-Ring, Adapter 3×
- 106 44827 Dichtung, Niederdruck 3×
- 112 701318 O-Ring, Saugstutzen 6×
- 113 701319 Stützring, Saugstutzen 6×
- 123 13266 O-Ring, V-Packung, Zylinder 3×
- 127 44829 V-Packung 6×
- 158 48362 Stützring, V-Packung, Zylinder 3×
- 159 20137 O-Ring, V-Packung, Zylinder 3×
Seal kit

701714

EPDM (0.0220)Ethylene Propylene Diene Monomer

contains 9 items · one kit per pump
Parts list
- 97 701490 O-Ring, Plungerhalter 3×
- 104 701656 O-Ring, Adapter 3×
- 106 48244 Dichtung, Niederdruck 3×
- 112 701495 O-Ring, Saugstutzen 6×
- 113 701319 Stützring, Saugstutzen 6×
- 123 701657 O-Ring, V-Packung, Zylinder 3×
- 127 44608 V-Packung 6×
- 158 48362 Stützring, V-Packung, Zylinder 3×
- 159 701492 O-Ring, V-Packung, Zylinder 3×

Valve kits

Valve kit

34017

NBR (STD)Medium Nitrile (Buna-N)

contains 11 items · 2 kits per pump
Parts list
- 162 48363 Stützring, Ventilsitz 3×
- 163 26142 O-Ring, Ventilsitz 3×
- 164 44727 Ventilsitz (3520, 3520C) 3×
- 164 44612 Ventilsitz 3×
- 166 43932 Ventil (3520, 3520C) 3×
- 166 44108 Ventil 3×
- 167 44109 Feder, Ventil 3×
- 168 44728 Federhalter, Ventil 3×
- 170 44729 Scheibe, Federhalter 3×
- 172 89827 O-Ring, Ventilstopfen 3×
- 173 48364 Stützring, Ventilstopfen 3×
Valve kit

31955

FPM (0.0110)Fluorocarbon

contains 9 items · 2 kits per pump
Parts list
- 162 48363 Stützring, Ventilsitz 3×
- 163 14330 O-Ring, Ventilsitz 3×
- 164 44612 Ventilsitz (3520, 3520C) 3×
- 166 44108 Ventil (3520, 3520C) 3×
- 167 44109 Feder, Ventil 3×
- 168 44728 Federhalter, Ventil 3×
- 170 44729 Scheibe, Federhalter 3×
- 172 11747 O-Ring, Ventilstopfen 3×
- 173 48364 Stützring, Ventilstopfen 3×
Valve kit

31952

EPDM (0.0220)Ethylene Propylene Diene Monomer

contains 9 items · 2 kits per pump
Parts list
- 162 48363 Stützring, Ventilsitz 3×
- 163 701493 O-Ring, Ventilsitz 3×
- 164 44612 Ventilsitz (3520, 3520C) 3×
- 166 44108 Ventil (3520, 3520C) 3×
- 167 44109 Feder, Ventil 3×
- 168 44728 Federhalter, Ventil 3×
- 170 44729 Scheibe, Federhalter 3×
- 172 701494 O-Ring, Ventilstopfen 3×
- 173 48364 Stützring, Ventilstopfen 3×