High Pressure Plunger Pump · Frame size 35 PFR 3521DHS

Name: 3521DHS
Brand: CAT PUMPS
SKU: 3521DHS

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	94.6 l/min
Operating pressure	138 bar
Speed	870 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.

8 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	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	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	45365	Manifold, Inlet (Model 3521DHS)SS	1
112	11379	O-Ring, Inlet Manifold - 70DNBR	3
117	44585	Screw, HSH (M14x40)S	4
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	49300	Plug, ValveSSD	6
185	49299	Manifold, DischargeSSD	1
188	89981	Screw, HSH (M12 x 70)S	8
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
–	30742	Passfeder, M10 x 8 x 70	1
–	34018	Mount, Direct (STZP R)	1
–	34314	Kit, Oil Drain (3/8" x 48") (Not Shown)	1
–	45116	Rod, Plunger (Model 3521C)SSZZ	3
–	45564	Adapter, FemaleSS	3
–	80540	Screw, Adjusting (M12 x 100) 2	1
–	121467	Rod, Connecting Assembly (Includes: 21, 22, 23) (Model 3521C)TNM	3
–	125397	Manifold, Inlet, Flushed (1/4" Flush Ports) (Model 3521C)SS	1
–	126611	Mount, Rail Assembly (STZP R)	1
–	818373	Head, Complete with NBR Seals and O-Rings (3521DHS)	1
–	819000	Assembly, Crankcase, Cast Iron Conversion (Not Shown) 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

76841

NBR (STD)Medium Nitrile (Buna-N)

contains 10 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 11379 O-Ring, Saugstutzen 3×
- 123 12391 O-Ring, V-Packung Zylinder 3×
- 127 44608 V-Packung 6×
- 155 48860 O-Ring, V-Packing Spacer 3×
- 156 48362 Backup Ring, V-Packing Spacer 3×
- 158 48362 Stützring, V-Packung Zylinder 3×
- 159 48860 O-Ring, V-Packung Zylinder 3×
Seal kit

76842

FPM (0.0110)Fluorocarbon

contains 10 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 14183 O-Ring, Saugstutzen 3×
- 123 13266 O-Ring, V-Packung Zylinder 3×
- 127 44829 V-Packung 6×
- 155 20137 O-Ring, Distanzstück, V-Packung 3×
- 156 48362 Stützring, V-Packung, Zylinder 3×
- 158 48362 Stützring, V-Packung Zylinder 3×
- 159 20137 O-Ring, V-Packung Zylinder 3×
Seal kit

76843

EPDM (0.0220)Ethylene Propylene Diene Monomer

contains 10 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 701491 O-Ring, Saugstutzen 3×
- 123 701657 O-Ring, V-Packung Zylinder 3×
- 127 44608 V-Packung 6×
- 155 701492 O-Ring, Distanzstück, V-Packung 3×
- 156 48362 Stützring, V-Packung, Zylinder 3×
- 158 48362 Stützring, V-Packung Zylinder 3×
- 159 701492 O-Ring, V-Packung Zylinder 3×
Seal kit

76844

IPFE (0.0770)I-Perfluoroelastomer

contains 9 items · one kit per pump
Parts list
- 97 702961 O-Ring, Plungerhalter 3×
- 104 702977 O-Ring, Adapter 3×
- 106 76298 Dichtung, Niederdruck 3×
- 112 702705 O-Ring, Saugstutzen 3×
- 123 703481 O-Ring, V-Packung Zylinder 3×
- 127 44608 V-Packung 6×
- 158 20464 Stützring, V-Packung Zylinder 3×
- 158 48362 Stützring, V-Packung Zylinder 3×
- 159 703159 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×
Valve kit

76617

IPFE (0.0770)I-Perfluoroelastomer

contains 12 items · 2 kits per pump
Parts list
- 162 48363 Stützring, Ventilsitz 3×
- 162 44614 Stützring, Ventilsitz 3×
- 163 702808 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 703169 O-Ring, Ventilstopfen 3×
- 172 701369 O-Ring, Ventilstopfen 3×
- 173 48364 Stützring, Ventilstopfen 3×
- 173 20388 Stützring, Ventilstopfen 3×