High Pressure Plunger Pump · Frame size 38 PFR 3811HS

Name: 3811HS
Brand: CAT PUMPS
SKU: 3811HS

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.

Request this pump Data sheet (PDF) Spare parts

Technical specifications

Flow rate	53 l/min
Operating pressure	207 bar
Speed	800 min⁻¹
Inlet port	1 1/2" NPT(F)
Discharge port	1" NPT(F)
Shaft diameter	35 mm
Material	Stainless Steel

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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.

8 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
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
65	49167	Rod, PlungerSSHB	3
69	126587	Washer, Oil SealSTCP	3
70	100488	Seal, Oil, CrankcaseNBRS	3
75	43506	Slinger, BarrierS	3
75	43865	Slinger, BarrierS	3
88	45675	Washer, KeyholeS	3
88	45676	Washer, Keyhole (M16)S	3
90	43866	Plunger (M25 x 145)CC	3
90	43945	Plunger (M20x145) Model 3501,3501C, Plunger (M25x145) Model 3511, 3511CCC	3
95	89778	Stud, Plunger Retainer (M10x135)SS	3
95	89779	Stud, Retainer (M7x123) Model 3501, 3501C, Stud, Retainer (M10x135) Model 3511, 3511CS	3
96	20184	Backup Ring, Plunger RetainerPTFE	3
96	20189	Back-up-Ring, Plunger RetainerPTFE	3
97	11345	O-Ring, Plunger Retainer - 70DNBR	3
97	14190	O-Ring, Plunger Retainer - 70DNBR	3
98	44069	Gasket, Plunger Retainer (M7) Model 3501, 3501C, Gasket, Plunger Retainer (M10) Model 3511, 3511CSS	3
98	44085	Gasket, Plunger Retainer (M7) Model 3501, 3501C, Gasket, Plunger Retainer (M10) Model 3511, 3511CSS	3
99	44068	Retainer, Plunger (M7) [7/02]SS	3
99	44084	Retainer, Plunger (M10)SS	3
100	814279	Retainer, Seal, 2-PiecePVDF	3
101	44095	Wick, Long Tab	3
101	44096	Wick, Long Tab	3
104	43875	O-Ring, Inlet Adapter - 70DNBR	3
105	701323	Adapter, Inlet, Low-Pressure SealSS	3
105	701344	Adapter, InletSS	3
106	44071	Seal, Low-Pressure with SS - SpringNBR	3
106	44086	Seal, Low-Pressure with SS-SpringNBR	3
107	44074	Washer, Low-Pressure SealSS	3
107	44089	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	701367	Spacer, CylinderSS	3
123	12391	O-Ring, V-Packing Cylinder - 70DNBR	3
124	701336	Cylinder, V-PackingSS	3
124	701448	Cylinder, V-PackingSS	3
126	44164	Adapter, FemaleSS	3
126	701325	Adapter, FemaleSS	3
127	44607	V-Packing Model 3501, 3501C, V-Packing Model 3511, 3511C 9/6STG
127	44610	V-Packing Model 3501, 3501C, V-Packing Model 3511, 3511C 9/6STG
128	44165	Adapter, MaleSS	3
128	701326	Adapter, MaleSS	3
141	45113	Spring, CoilSS	15
142	701447	Spacer with Coil SpringsSS	3
155	11379	O-Ring, Inlet Manifold - 70DNBR	6
155	132961	O-Ring, V-Packing Spacer 3/6NBR	6
156	28243	Back-up-Ring, V-Packing Spacer 3/6PTFE	6
156	28675	Back-up-Ring, V-Packing Spacer 3/6PTFE	6
157	701352	Spacer, V-PackingSS	3
157	701385	Spacer, V-PackingSS	3
162	21985	Backup Ring, SeatPTFE	6
163	26089	O-Ring, Seat - 80DNBR	6
164	44080	SeatSS	6
166	44081	ValveSS	6
167	44082	SpringSS	6
168	44735	Retainer, SpringPVDF	6
170	44794	Washer, Spring RetainerSS	6
171	44793	Spring, Coil, Valve PlugSS	6
172	15853	O-Ring, Valve Plug - 70DNBR	6
173	20224	Back-up-Ring, Valve PlugPTFE	6
174	701260	Plug, ValveSS	6
175	87951	Screw, HSH (M10x30)S	36
185	701314	Manifold, Discharge, Block-StyleSS	1
185	701785	Manifold, Discharge, Block-StyleSS	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 WashersPOP	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
–	701408	Manifold, Inlet, Flushed (Models 3801KHS, 3811KHS)SS	1
–	701786	Kit, Seal - Standard NBR (Models 3801HS, 3801KHS)	1
–	819000	Assembly, Crankcase, Cast Iron Conversion (Not Shown) 1	1
–	901370	Head, Complete with NBR Seals and O-Rings (Model 3811HS)	1
–	901371	Head, Complete with NBR Seals and O-Rings (Model 3811KHS)	1
–	901388	Head, Complete with NBR Seals and O-Rings (Model 3801HS)	1
–	901389	Head, Complete with NBR Seals and O-Rings (Model 3801KHS)	1
–	990013	Hub, "B", 35 mm (STL) 1	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

701793

NBR (STD)Medium Nitrile (Buna-N)

contains 10 items · one kit per pump
Parts list
- 97 14190 O-Ring, Plungerhalter (3801, 3801K) 3×
- 104 43875 O-Ring, Adapter 3×
- 106 44071 Dichtung, Niederdruck (3801, 3801K) 3×
- 112 701794 O-Ring, Saugstutzen 6×
- 113 701319 Stützring, Saugstutzen 6×
- 123 12391 O-Ring, V-Packung, Zylinder 3×
- 127 44607 V-Packung (3801, 3801K) 9×
- 155 17622 O-Ring, Distanzstück, V-Packung (3801, 3801K) 6×
- 155 132961 O-Ring, V-Packing Spacer (3801HS, 3801KHS) 6×
- 156 28675 Stützring, Distanzstück, V-Packung (3801, 3801K) 6×
Seal kit

701802

FPM (0.0110)Fluorocarbon

contains 9 items · one kit per pump
Parts list
- 97 14161 O-Ring, Plungerhalter (3801, 3801K) 3×
- 104 44826 O-Ring, Adapter 3×
- 106 44381 Dichtung, Niederdruck (3801, 3801K) 3×
- 112 701318 O-Ring, Saugstutzen 6×
- 113 701319 Stützring, Saugstutzen 6×
- 123 13266 O-Ring, V-Packung, Zylinder 3×
- 127 44607 V-Packung (3801, 3801K) 9×
- 155 11719 O-Ring, Distanzstück, V-Packung (3801, 3801K) 6×
- 156 28675 Stützring, Distanzstück, V-Packung (3801, 3801K) 6×
Seal kit

701803

EPDM (0.0220)Ethylene Propylene Diene Monomer

contains 9 items · one kit per pump
Parts list
- 97 48239 O-Ring, Plungerhalter (3801, 3801K) 3×
- 104 701656 O-Ring, Adapter 3×
- 106 701974 Dichtung, Niederdruck (3801, 3801K) 3×
- 112 701495 O-Ring, Saugstutzen 6×
- 113 701319 Stützring, Saugstutzen 6×
- 123 701657 O-Ring, V-Packung, Zylinder 3×
- 127 44607 V-Packung (3801, 3801K) 9×
- 155 701654 O-Ring, Distanzstück, V-Packung (3801, 3801K) 6×
- 156 28675 Stützring, Distanzstück, V-Packung (3801, 3801K) 6×
Seal kit

76793

IPFE (0.0770)I-Perfluoroelastomer

contains 9 items · one kit per pump
Parts list
- 97 703586 O-Ring, Plunger Retainer (3801HS, 3801KHS) 3×
- 104 702977 O-Ring, Adapter 3×
- 106 703179 Seal, Low-Pressure with SSSpring (3801HS, 3801KHS) 3×
- 112 702969 O-Ring, Saugstutzen 6×
- 113 701319 Stützring, Saugstutzen 6×
- 123 703481 O-Ring, V-Packung, Zylinder 3×
- 127 44607 V-Packing (3801HS, 3801KHS) 9×
- 155 701716 O-Ring, V-Packing Spacer (3801HS, 3801KHS) 6×
- 156 28675 Stützring, Distanzstück, V-Packung (3801, 3801K) 6×

Valve kits

Valve kit

34151

NBR (STD)Medium Nitrile (Buna-N)

contains 10 items · 2 kits per pump
Parts list
- 162 21985 Stützring, Ventilsitz 3×
- 163 26089 O-Ring, Ventilsitz 3×
- 164 44080 Ventilsitz 3×
- 166 44081 Ventil 3×
- 167 44082 Feder, Ventil 3×
- 168 44735 Federhalter, Ventil 3×
- 170 44794 Scheibe, Federhalter 3×
- 172 15853 O-Ring, Ventilstopfen 3×
- 172 89827 O-Ring, Ventilstopfen 3×
- 173 20224 Stützring, Ventilstopfen 3×
Valve kit

701798

FPM (0.0110)Fluorocarbon

contains 10 items · 2 kits per pump
Parts list
- 162 21985 Stützring, Ventilsitz 3×
- 163 11377 O-Ring, Ventilsitz 3×
- 164 44080 Ventilsitz 3×
- 166 44081 Ventil 3×
- 167 44082 Feder, Ventil 3×
- 168 44735 Federhalter, Ventil 3×
- 170 44794 Scheibe, Federhalter 3×
- 172 11720 O-Ring, Ventilstopfen 3×
- 172 11747 O-Ring, Ventilstopfen 3×
- 173 20224 Stützring, Ventilstopfen 3×
Valve kit

701799

EPDM (0.0220)Ethylene Propylene Diene Monomer

contains 9 items · 2 kits per pump
Parts list
- 162 21985 Stützring, Ventilsitz 3×
- 163 46647 O-Ring, Ventilsitz 3×
- 164 44080 Ventilsitz 3×
- 166 44081 Ventil 3×
- 167 44082 Feder, Ventil 3×
- 168 44735 Federhalter, Ventil 3×
- 170 44794 Scheibe, Federhalter 3×
- 172 701481 O-Ring, Ventilstopfen 3×
- 173 20224 Stützring, Ventilstopfen 3×
Valve kit

76171

IPFE (0.0770)I-Perfluoroelastomer

contains 9 items · 2 kits per pump
Parts list
- 162 21985 Stützring, Ventilsitz 3×
- 163 703244 O-Ring, Ventilsitz 3×
- 164 44080 Ventilsitz 3×
- 166 44081 Ventil 3×
- 167 44082 Feder, Ventil 3×
- 168 44735 Federhalter, Ventil 3×
- 170 44794 Scheibe, Federhalter 3×
- 172 702974 O-Ring, Ventilstopfen 3×
- 173 20224 Stützring, Ventilstopfen 3×