High Pressure Plunger Pump · Frame size 35 PFR 3550

Name: 3550
Brand: CAT PUMPS
SKU: 3550

This triplex (three plunger rods) positive displacement, reciprocating plunger pump is constructed with a chrome-plated brass block-style manifold, 304 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	38 l/min
Operating pressure	414 bar
Speed	940 min⁻¹
Inlet port	3/4" NPT
Discharge port	1/2" NPT
Shaft diameter	35 mm
Material	Brass

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.

2 kits bundle wearing parts of this pump ↓

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Parts list

Item	Part no.	Description	Qty
2	30742	Passfeder, M10 x 8 x 70STL	1
5	125753	Screw, HHC, Sems (M8 x 25) (Model 2530E)S	8
8	44542	Deckel, LagerAL	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
15	29326	Bearing, RollerSTL	2
20	121467	Rod, Connecting Assembly (Includes: 21, 22, 23) (Model 3521C)TNM	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 - 2	2
38	44428	Gasket, Flat, Oil Gauge - 80DNBR	2
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)AL	1
51	16612	O-Ring, Cover - 70DNBR	1
53	49755	Kurbelgehäuse (Enthält: 34, 54)AL	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	49076	Rod, PlungerSSHB	3
69	126587	Washer, Oil SealSTCP	3
70	100488	Seal, Oil, CrankcaseNBRS	3
75	110669	Slinger, BarrierS	3
86	132952	AdapterD	3
88	110670	Washer, Keyhole (M16)S	3
90	132953	Plunger (M20x110)CC	3
95	126549	Stud, Plunger Retainer (M7x103)STCP	3
96	132954	Back-up-Ring, Plunger RetainerPTFB	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
99	44068	Retainer, Plunger (M7) [7/02]SS	3
100	44119	Retainer, Seal, RearPPG	3
101	44095	Wick, Long Tab	3
106	43513	Seal, LPS w/SS-SpgNBR	3
110	132956	Manifold, SealBBCP	1
112	11373	O-Ring, Inlet Manifold - 70DNBR	4
117	44585	Screw, HSH (M14x40)S	4
118	48702	Plug [1/4" NPT(M)]S	2
126	132958	Adapter, FemalePTFB	3
127	43516	V-PackingSNG	9
128	43517	Adapter, MaleBB	3
136	132964	Retainer, Valve AssyBB	3
155	14200	O-Ring, Seal Case - 70DNBR	6
156	132960	Back-up-Ring, Valve SpacerPTFE	6
157	132959	Spacer, ValveBB	3
162	48510	Back-up-Ring, Valve SeatPTFE	6
163	11338	O-Ring, Valve Seat - 70DNBR	6
164	132965	Seat, ValveS	6
166	48793	ValveSS	6
167	43751	Spring, ValveS	6
168	44564	Retainer, SpringPVDF	6
172	14179	O-Ring, Oil Filler Cap - 70DNBR	3
173	49850	Backup Ring, Valve PlugPTFB	3
174	132966	Plug, ValveBB	3
177	89921	Screw, HSH (M12 x 30)S	8
178	132967	Cover, ValveBB	1
185	132962	Manifold, Inlet/Discharge, Block-StyleBBCP	1
186	19935	Washer (M12)SCP	16
188	128035	Screw, HSH (M12 x 110)S	8
250	44516	Wellenschutzkappe m/2 Schrauben, Federringen und Scheiben (bei Pumpe)NY	1
255	34018	Mount, Direct (STZP R)STZP	1
260	126611	Mount, Rail Assembly (STZP R)STZP	1
278	80540	Screw, Adjusting (M12 x 100) 2ZP	1
279	30278	Oiler (1 oz) (Not Shown) 3STZP	3
283	34314	Kit, Oil Drain (3/8" x 48") (Not Shown)	1
290	6124	Gasket, Liquid (3 oz. / 0,1 l)	1
299	818608	Head, CompleteBBCP	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

76982

NBRMedium Nitrile (Buna-N)

contains 7 items · one kit per pump
Parts list
- 97 14190 O-Ring, Plungerhalter - 70D 3×
- 106 43513 Dichtung, Niederdruck m/SS-Feder 3×
- 112 11373 O-Ring, Saugstutzen 4×
- 126 132958 Adapter, weiblich 3×
- 127 43516 V-Packung 9×
- 155 14200 O-Ring, Distanzstück - 70D 6×
- 156 132960 Stützring, Distanzstück 6×

Valve kits

Valve kit

77033

NBRMedium Nitrile (Buna-N)

contains 8 items · 2 kits per pump
Parts list
- 162 48510 Stützring, Ventilsitz 3×
- 163 11338 O-Ring, Ventilsitz - 70D 3×
- 164 132965 Ventilsitz 3×
- 166 48793 Ventil 3×
- 167 43751 Feder 3×
- 168 44564 Federhalter, Ventil 3×
- 172 14179 O-Ring, Ventilstopfen - 70D 3×
- 173 49850 Stützring, Ventilstopfen 3×