High Pressure Plunger Pump · Frame size 38 PFR 3841HS

Name: 3841HS
Brand: CAT PUMPS
SKU: 3841HS

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

The 3841HS is also available in an alternate specification with a different operating point: 189 l/min, 103 bar, 850 min⁻¹. View alternate specification

Request this pump Data sheet (PDF) Spare parts

Technical specifications

Flow rate	170 l/min
Operating pressure	70 bar
Speed	765 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.

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
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
64	43864	Pin, CrossheadCM	3
65	49166	Rod, Plunger (Model 3521DHS)SSHB	3
69	126587	Washer, Oil SealSTZP	3
70	100488	Seal, Oil, CrankcaseNBRS	3
75	43865	Slinger, BarrierS	3
88	45676	Washer, Keyhole (M16)S	3
90	46806	Plunger (M45 x 145)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
106	48384	Seal, Low-Pressure, with SS-SpringNBR	3
107	48380	Spacer, Low-Pressure SealD	3
110	701865	Manifold, InletSS	1
111	701116	Plug, Inlet [1-1/2" NPT(M)]SS	1
112	701632	O-Ring, Spacer, InletNBR	6
113	701329	Backup Ring, Spacer, InletPTFE	6
114	701327	Spacer, InletSS	3
117	701252	Screw, HSH (M14 x 100)SS	4
118	701077	Plug, [1/4" NPT(M)]SS	3
126	48383	Adapter, FemaleD	3
127	46813	V-PackingSTGS	6
128	48386	Adapter, MaleSS	3
141	49483	Spring, Coil, LargeSS	3
155	17784	O-Ring, V-Packing Spacer - 80DNBR	6
157	49506	Spacer, V-PackingSS	3
163	26143	O-Ring, Seat - 80DNBR	6
164	48393	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	701866	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	3
–	30696	Reverse Pliers (Not Shown)	1
–	32273	Crankcase Oil Seal Removal and Installation Kit (Not Shown)	1
–	34018	Mount, Direct (STZP R)	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
–	92674	Mount, Rail Assembly (STZP R) (Includes: 34018)	1
–	701982	Manifold, InletSS	1
–	819000	Assembly, Crankcase, Cast Iron Conversion (Not Shown) 1	1
–	901410	Head, Complete with NBR Seals and O-Rings (Model 3841HS)	1
–	901411	Head, Complete with NBR Seals and O-Rings (Model 3841KHS)	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

31934

NBR (STD)Medium Nitrile (Buna-N)

contains 6 items · one kit per pump
Parts list
- 97 11345 O-Ring, Plunger Retainer - 70D 3×
- 106 48384 Seal, Low-Pressure, with SS-Spring 3×
- 112 701632 O-Ring, Spacer, Inlet 6×
- 113 701329 Backup Ring, Spacer, Inlet 6×
- 127 46813 V-Packing 6×
- 155 17784 O-Ring, V-Packing Spacer - 80D 6×
Seal kit

31961

FPM (0.0110)Fluorocarbon

contains 6 items · one kit per pump
Parts list
- 97 11375 O-Ring, Plunger Retainer 3×
- 106 702013 Seal, Low-Pressure, with SS-Spring 3×
- 112 701328 O-Ring, Inlet Manifold 6×
- 113 701329 Backup Ring, Spacer, Inlet 6×
- 127 703080 V-Packing 6×
- 155 20138 O-Ring, V-Packing Cylinder 6×
Seal kit

31923

EPDM (0.0220)Ethylene Propylene Diene Monomer

contains 6 items · one kit per pump
Parts list
- 97 701490 O-Ring, Plunger Retainer 3×
- 106 46945 Seal, Low-Pressure with SS-Spring 3×
- 112 701973 O-Ring, Inlet Manifold 6×
- 113 701329 Backup Ring, Spacer, Inlet 6×
- 127 46813 V-Packing 6×
- 155 701658 O-Ring, V-Packing Cylinder 6×

Valve kits

Valve kit

33835

NBR (STD)Medium Nitrile (Buna-N)

contains 10 items · 2 kits per pump
Parts list
- 163 26143 O-Ring, Ventilsitz 3×
- 164 46822 Ventilsitz (3545HS) 3×
- 164 48393 3×
- 166 43932 Ventil (3545HS) 3×
- 166 44108 Valve 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

31262

FPM (0.0110)Fluorocarbon

contains 8 items · 2 kits per pump
Parts list
- 163 14331 O-Ring, Ventilsitz 3×
- 164 48393 3×
- 166 44108 Valve 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

31264

EPDM (0.0220)Ethylene Propylene Diene Monomer

contains 11 items · 2 kits per pump
Parts list
- 163 171660 O-Ring, Ventilsitz 3×
- 163 701660 O-Ring, Valve Seat 3×
- 164 46822 Seat (3545HS) 3×
- 164 48393 3×
- 166 43932 Valve (3545HS) 3×
- 166 44108 Valve 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×