High Pressure Plunger Pump · Frame size 38 PFR

3831HS

Name: 3831HS
Brand: CAT PUMPS
SKU: 3831HS

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.

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Technical specifications

Flow rate	136.3 l/min
Operating pressure	83 bar
Speed	800 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	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
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	43921	Plunger (M40 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	814279	Retainer, Seal, 2-PiecePVDF	3
101	44112	Wick, Long Tab	3
106	44113	Seal, Low-Pressure, with SS-SpringNBR	3
107	45381	Spacer, 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
126	45367	Adapter FemaleSS	3
127	44609	V-PackingSTG	6
128	45368	Adapter, MaleSS	3
141	49519	Spring, Large CoilSS	3
155	48860	O-Ring, V-Packing Cylinder - 90DNBR	3
156	48362	Backup Ring, V-Packing, Spacer, OuterD	3
157	49520	Spacer, V-PackingSS	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	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
–	819000	Assembly, Crankcase, Cast Iron Conversion (Not Shown) 1	1
–	901400	Head, Complete with NBR Seals and O-Rings (Model 3831HS)	1
–	901404	Head, Complete with NBR Seals and O-Rings (Model 3831KHS)	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 listcovered 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
701698
NBR (STD)Medium Nitrile (Buna-N)
contains 9 items · one kit per pump
Parts list
- 9711345O-Ring, Plungerhalter3×
- 10644113Dichtung, Niederdruck m/SS-Feder3×
- 112701794O-Ring, Saugstutzen6×
- 113701319Stützring, Saugstutzen6×
- 12744609V-Packung6×
- 15548860O-Ring, Distanzstück, V-Packung3×
- 15648362Stützring, Distanzstück, V-Packung3×
- 15848362Stützring, Distanzstück, V-Packung3×
- 15948860O-Ring, Distanzstück, V-Packung3×
Seal kit
33268
FPM (0.0110)Fluorocarbon
contains 9 items · one kit per pump
Parts list
- 9711375O-Ring, Plungerhalter3×
- 10644740Dichtung, Niederdruck m/SS-Feder3×
- 112701318O-Ring, Saugstutzen6×
- 113701319Stützring, Saugstutzen6×
- 12744741V-Packung6×
- 15520137O-Ring, Distanzstück, V-Packung3×
- 15648362Stützring, Distanzstück, V-Packung3×
- 15848362Stützring, Distanzstück, V-Packung3×
- 15920137O-Ring, Distanzstück, V-Packung3×
Seal kit
701797
EPDM (0.0220)Ethylene Propylene Diene Monomer
contains 9 items · one kit per pump
Parts list
- 97701490O-Ring, Plungerhalter3×
- 10646955Dichtung, Niederdruck m/SS-Feder3×
- 112701495O-Ring, Saugstutzen6×
- 113701319Stützring, Saugstutzen6×
- 12744609V-Packung6×
- 155701492O-Ring, Distanzstück, V-Packung3×
- 15648362Stützring, Distanzstück, V-Packung3×
- 15848362Stützring, Distanzstück, V-Packung3×
- 159701492O-Ring, Distanzstück, V-Packung3×

Valve kits

Valve kit
34017
NBR (STD)Medium Nitrile (Buna-N)
contains 11 items · 2 kits per pump
Parts list
- 16248363Stützring, Ventilsitz3×
- 16326142O-Ring, Ventilsitz3×
- 16444727Ventilsitz (3520, 3520C)3×
- 16444612Ventilsitz3×
- 16643932Ventil (3520, 3520C)3×
- 16644108Ventil3×
- 16744109Feder, Ventil3×
- 16844728Federhalter, Ventil3×
- 17044729Scheibe, Federhalter3×
- 17289827O-Ring, Ventilstopfen3×
- 17348364Stützring, Ventilstopfen3×
Valve kit
31955
FPM (0.0110)Fluorocarbon
contains 9 items · 2 kits per pump
Parts list
- 16248363Stützring, Ventilsitz3×
- 16314330O-Ring, Ventilsitz3×
- 16444612Ventilsitz (3520, 3520C)3×
- 16644108Ventil (3520, 3520C)3×
- 16744109Feder, Ventil3×
- 16844728Federhalter, Ventil3×
- 17044729Scheibe, Federhalter3×
- 17211747O-Ring, Ventilstopfen3×
- 17348364Stützring, Ventilstopfen3×
Valve kit
31952
EPDM (0.0220)Ethylene Propylene Diene Monomer
contains 9 items · 2 kits per pump
Parts list
- 16248363Stützring, Ventilsitz3×
- 163701493O-Ring, Ventilsitz3×
- 16444612Ventilsitz (3520, 3520C)3×
- 16644108Ventil (3520, 3520C)3×
- 16744109Feder, Ventil3×
- 16844728Federhalter, Ventil3×
- 17044729Scheibe, Federhalter3×
- 172701494O-Ring, Ventilstopfen3×
- 17348364Stützring, Ventilstopfen3×