35 Frame

Plunger Pumps
Stainless Steel Models

3501, 3511
SS Flushed Models
Model 3511 Shown
3501C, 3511C
(Shaft protector included, mounting rails sold separately)

FEATURES SPECIFICATIONS U.S. Measure Metric Measure

l Triplex design delivers high efficiency and low pulsation. Models 3501, 3501C
l Durable custom V-Packings are lubricated and cooled by pumped Flow............................................................. ..10.0 gpm (38 l/m)
liquid. Pressure Range...............................100 to 5000 psi (7 to 345 bar)
l Pre-set Lo-Pressure Seals provide secondary protection against external RPM..................................................................915 rpm (915 rpm)
Bore......................................................................0.787” (20 mm)
leaks and require no packing adjustments.
l Special high-density, polished, concentric plungers provide a true
surface and extended seal life. Models 3511, 3511C
Flow............................................................. ..14.0 gpm (53 l/m)
l Wet-end easily serviced without entering crankcase.
Pressure Range...............................100 to 3000 psi (7 to 210 bar)
RPM..................................................................800 rpm (800 rpm)
COMMON SPECIFICATIONS Bore......................................................................0.984” (25 mm)
Inlet Pressure Range.......................... ..Flooded to 70 psi (Flooded to 4.9 bar)
Stroke.............................................................................. 1.890” (48 mm)
Crankcase Capacity..................................................4.2 Qts. (4 l)
Maximium Liquid Temperature..............................160°F (71°C)
Above 130°F call Cat Pumps for inlet conditions and elastomer recommendations.
ELECTRIC HORSEPOWER REQUIREMENTS
Inlet Ports (2).....................................................1-1/2” NPTF (1-1/2” NPTF) MODEL FLOW PRESSURE RPM
Flushing Ports (2) (3501,3501C).....................1/4” NPTF (1/4” NPTF) psi psi psi psi psi psi
Discharge Ports (2) (3501,3511C)..................3/4” NPTF (3/4” NPTF) 2000 2500 3000 4000 4500 5000
Discharge Ports (2) (3511,3511C)...................... 1” NPTF (1” NPTF) U.S. bar bar bar bar bar bar
Pulley Mounting................................................ Either Side (Either Side) gpm lpm 140 175 210 275 310 345
Shaft Diameter............................................................ 1.378” (35mm) 10.0 38.0 N/A N/A N/A 27.4 30.8 34.2 915
3501
Weight...................................................................... 130.6 lbs. (59 kg) 9.0 34.0 N/A N/A N/A 24.7 27.7 30.8 824
3501C
Dimensions....................................... 24.51 x 18.11 x 9.72” (623 x 460 x 247 mm) 8.0 30.0 N/A N/A N/A 21.9 24.7 27.4 711
14.0 53.0 19.2 24.0 28.8 N/A N/A N/A 800
3511
12.0 45.0 16.4 20.6 24.7 N/A N/A N/A 685
All High Pressure Systems require a primary pressure regulating device (i.e. regulator, 3511C
unloader) and a secondary pressure relief device (i.e. pop-off valve, relief valve). Failure 10.0 38.0 13.7 17.1 20.6 N/A N/A N/A 571
to install such relief devices could result in personal injury or damage to pump or
property. CAT PUMPS does not assume any liability or responsibility for the operation
of a customer’s high pressure system.

Read all CAUTIONS and WARNINGS before commencing service or operation of any DETERMINING Rated gpm = “Desired” gpm
high pressure system. The CAUTIONS and WARNINGS are included in each service THE PUMP R.P.M. Rated rpm “Desired” rpm
manual and with each Accessory Data sheet. CAUTIONS and WARNINGS can also be
DETERMINING gpm x psi = Electric Brake
viewed online at www.catpumps.com/cautions-warnings or can be requested directly
from CAT PUMPS. THE REQUIRED H.P. 1460 H. P. Required
DETERMINING Motor Pulley O.D. = Pump Pulley O.D.
MOTOR PULLEY SIZE Pump rpm Motor rpm
See complete Drive Packages [Inclds: Pulleys, Belts, Hubs, Key] Tech Bulletin 003.
Refer to pump Service Manual for repair procedure and additional technical information.
 PARTS LIST
ITEM 3501/C MATL 3511/C MATL DESCRIPTION QTY
2 34021 STL 34021 STL Key (M10x8x70) 1
5 125753 S 125753 S Screw, HH Sems (M8x25) 8
8 44542 AL 44542 AL Cover, Bearing 2
9 815279 FBR 815279 FBR Shim, Split, 2 pc 2
10 12398 NBR 12398 NBR O-Ring, Bearing Cover - 70D 2
11 13296 NBR 13296 NBR Seal, Oil, Crankshaft 2
15 29326 STL 29326 STL Bearing, Roller 2
20 126725 BZ 126725 BZ Rod, Connecting Assy (Inclds: 21, 22, 23) 3
21 126749 STCP R 126749 STCP R Washer, Locking (M10) 3
22 126593 STCP R 126593 STCP R Washer, Flat (M10) 6
23 122045 STZP 122045 STZP Screw, HH (M10x55) 6
25 29325 FCM 29325 FCM Crankshaft, Dual End (M48) 1
31 828710 PE 828710 PE Protector, Oil Cap w/Foam Gasket 1
32 43211 ABS 43211 ABS Cap, Oil Filler 1
33 14177 NBR 14177 NBR O-Ring, Oil Filler Cap - 70D 1
34 126743 STCP R 126743 STCP R Bolt, Eye (M12x1.75) (For Lifting Pump Only) 1
37 92241 — 92241 — Gauge, Bubble Oil w/Gasket - 80D 1
38 44428 NBR 44428 NBR Gasket, Flat Oil Gauge - 80D 1
40 125753 S 125753 S Screw, HH Sems (M8x25) 8
48 25625 STCP 25625 STCP Plug, Drain (1/4”x19BSP) 1
49 23170 NBR 23170 NBR O-Ring, Drain Plug - 70D 1
50 45936 AL 45936 AL Cover, Rear 1
51 16612 NBR 16612 NBR O-Ring, Cover - 70D 1
53 44487 AL 44487 AL Crankcase Assy (Inclds: 34, 54) 1
54 27488 S 27488 S Pin, Guide 2
56 27790 POP 27790 POP Pan, Oil 1
59 92538 S 92538 S Screw, HHC Sems (M6x16) 2
64 43864 CM 43864 CM Pin, Crosshead 3
65 45118 SSZZ 45116 SSZZ Rod, Plunger 3
69 126587 STCP R 126587 STCP R Washer, Oil Seal 3
70 100488 NBRS 100488 NBRS Seal, Oil, Crankcase 3
44739 FPM 44739 FPM Seal, Oil, Crankcase 3
75 43506 S 43865 S Slinger, Barrier 3
87 49667 SSL 109608 SS Collar 3
88 45675 S 45676 S Washer, Keyhole 3
90 43945 CC — — Plunger (M20x145) 3
— — 43866 CC Plunger (M25x145) 3
95 89779 S — — Stud, Retainer (M7x123) 3
— — 89778 SS Stud, Retainer (M10x135) 3
96 20184 PTFE 20189 PTFE Back-up-Ring, Plunger Retainer 3
97 14190 NBR 11345 NBR O-Ring, Plunger Retainer - 70D 3
14161 FPM 11375 FPM O-Ring, Plunger Retainer - 70D 3
98 44069 SS — — Gasket, Plunger Retainer (M7) 3
— — 44085 SS Gasket, Plunger Retainer (M10) 3
99 44068 SS — — Retainer, Plunger (M7) 3
— — 44084 SS Retainer, Plunger (M10) 3
100 814279 PVDF 814279 PVDF Retainer, Seal, 2 Pc. 3
101 44095 — 44096 — Wick 3
104 43875 NBR 43875 NBR O-Ring, Adapter - 70D 3
44826 FPM 44826 FPM O-Ring, Adapter - 70D 3
105 701344 SS 113022 SS Adapter, LPS 3
106 44071 NBR 44086 NBR Seal, LPS w/SS-Spg 3
44381 FPM 45846 FPM Seal, LPS w/SS-Spg 3
107 44074 SS 44089 SS Washer, LPS 3
110 45365 SS 45365 SS Manifold, Inlet 1
125397 SS 125397 SS Manifold, Inlet, Flushed (1/4” Flush Port) 3501C, 3511C 1
112 11379 NBR 11379 NBR O-Ring, Inlet Manifold - 70D 3
14183 FPM 14183 FPM O-Ring, Inlet Manifold 3
117 44585 S 44585 S Screw, HSH (M14x40) 4
123 12391 NBR 12391 NBR O-Ring, V-Packing Cylinder - 70D 3
13266 FPM 13266 FPM O-Ring, V-Packing Cylinder - 70D 3
124 49666 SSL 113023 SS Cylinder, V-Packing 3
126 44164 SS 113024 SS Adapter, Female 3
127 44607 STG* — — V-Packings 9
— — 44610 STG* V-Packings 6
128 44165 SS 113025 SS Adapter, Male 3
155 17622 NBR — — O-Ring, V-Packing Spacer - 85D 3
11719 FPM — — O-Ring, V-Packing Spacer 3
— — 11379 NBR O-Ring, V-Packing Spacer - 70D 6
— — 14183 FPM O-Ring, V-Packing Spacer 6
156 28675 PTFE — — Back-up-Ring, V-Packing Spacer 3
— — 28243 PTFE Back-up-Ring, V-Packing Spacer 6
157 49668 SSL 113026 SS Spacer, V-Packing 3
159 12390 NBR — — O-Ring, V-Packing Spacer - 70D 3
13264 FPM — — O-Ring, V-Packing Spacer 3
162 21985 PTFE 21985 PTFE Back-up-Ring, Seat 6
163 26089 NBR 26089 NBR O-Ring, Seat - 80D 6
11377 FPM 11377 FPM O-Ring, Seat - 80D 6
164 49671 SS 49671 SS Seat 6
166 44081 SS 44081 SS Valve 6
167 44082 SS 44082 SS Spring 6
168 44735 PVDF 44735 PVDF Retainer, Spring 6
170 44794 SS 44794 SS Washer, Spring Retainer 6
171 44793 SS 44793 SS Spring, Coil, Valve Plug 6
172 15853 NBR 15853 NBR O-Ring, Valve Plug - 70D 6
11720 FPM 11720 FPM O-Ring, Valve Plug - 70D 6
173 20224 PTFE 20224 PTFE Back-up-Ring, Valve Plug 6
174 45603 SS 45603 SS Plug, Valve 6
175 87951 S 87951 S Screw, HSH (M10x30) 36
185 49669 SSD 49672 SSD Manifold, Discharge 1
188 89981 S 89981 S Screw, HSH (M12x70) 8
 EXPLODED VIEW

250
8
10 31
11
15 20 40
32
23
22
5 33 37
21 50
51 38
34

48
49
25
283

64

65 15
69 54 11
10
70 2
75 9
53
8
100 56
5
59
101
175
95 278
88
104 174
90 105
FLUSHING 173
96
97 172
98
99
171
110 255
87 106 170
123 107
124 168
126 167
127
11 127 166
35 128 INLET 164 260
163
117
87 112 162
126
155 127
156 185
157 127
156 127
155 124
156 188 DISCHARGE
155
128 163
166
1 168
350 171 162
123 164
172
157 173 167
159 174
175 170
Models
3501, 3501C
3511, 3511C
May 2013
3501/C MATL 3511/C MATL DESCRIPTION
250 44516 NY 44516 NY Protector, Shaft, w/2 Screws, Washers, Lockwashers (included with pump) 1
255 34018 STZP R 34018 STZP R Assy, Direct Mount 1
— 34039 S 34039 S Assy, Direct Mount 1
260 92674 STZP R 92674 STZP R Mounting, Rail, Assy (Inclds: 34018) 1
275 990013 STL 990013 STL Hub, ‘B’ 35mm w/Keyway (See Tech Bulletin 003) 1
278 80540 ZP 80540 ZP Screw, HH (M12x100) (Rail Adjusting Screw) 1
279 30278 STZP 30278 STZP Oiler (1 oz.) (Not Shown) 3
281 30967 — 30967 — Glass, Oiler (Not Shown) 3
282 10069 NBR 10069 NBR Gasket, Oiler (Not Shown) 3
283 34314 — 34314 — Kit, Oil Drain (3/8” x 48”) 1
290 6124 — 6124 — Gasket, Liquid (3 oz.) 1
299 818459 SS 818438 SS Head, Complete 1
300 76037 NBR* — — Kit, Seal (Inclds: 97,104,106,112,123,127,155,156,159) 1
76235 FPM* — — Kit, Seal (Inclds: 97,104,106,112,123,127,155,156,159) 1
— — 31038 NBR* Kit, Seal (Inclds: 97,104,106,112,123,127,155,156) 1
— — 31266 FPM* Kit, Seal (Inclds: 97,104,106,112,123,127,155,156) 1
310 76251 NBR 76251 NBR Kit, Valve (Inclds: 162,163,164,166,167,168,170,172,173) 2
76798 FPM 76798 FPM Kit, Valve (Inclds: 162,163,164,166,167,168,170,172,173) 2
390 711500 SS 711500 SS C. A.T. (Inlet pressure stabilizer for RO and boosted inlet applications) 1
391 711506 SS 711506 SS Adapter (2 per C.A.T.) (See Data Sheet for complete selection) 2
392 701818 SS 701818 SS Elbow Assy used with Adapter Assy 711506 1
— 819000 F 819000 F Assy, Crankcase, Cast Iron Conversion 1
— 6119 — 6119 — Lubricate, Antisieze (1 oz.) (See Tech Bulletin 095) 1
— 6100 — 6100 — Oil, Case (12 Bottles) ISO-68 Hydraulic (Fill to specified crankcase capacity prior to start-up) 1
Bold print part numbers are unique to a particular pump model. Italics are optional items. [ ] Date of latest production change.R Components comply with RoHS Directive.
*Review individual parts in each kit for material code identification. Veiw Tech Bulletins 002, 003, 024, 035, 036, 041, 043, 052, 053, 068, 069, 074, 077, 080,083 and 095 for additional information.
C.A.T. highly recommended for pressurized inlet, R.O. and Industrial applications. MATERIAL CODES (Not Part of Part Number): ABS=ABS Plastic AL=Aluminum BB=Brass BZ=Bronze
CC=Ceramic CM=Chrome-Moly F=Cast Iron FBR=Fiber FCM=Forged Chrome-moly FPM=Fluorocarbon NAB=Nickel Aluminum Bronze NBR=Medium Nitrile (Buna-N) NBRS=Buna, Silicone Free
NY=Nylon PE=Polyethylene POP=Polypropylene PTFE=Pure Polytetrafluoroethylene PVDF=Polyvinylidene FluorideS=304SS SS=316SS SSL=316SS/Low Carbon
STG=Special Blend PTFE White SSD=Duplex Stainless SSZZ=316SS/Zamak STL=Steel STCP=Steel/Chrome Plated STZP=Steel/Zinc Plated ZP=Zinc Plated
 24.51 (623)
18.11 (460) (2) - 1" NPTF DISCHARGE 3511,3511C 19.41 (493)
8.94 (227) (2) - 3/4” NPTF DISCHARGE 3501,3501C 16.97 (431)
(2) - 1/4" NPTF FLUSHING
3501C, 3511C ONLY 13.43 (341)

.394 (10 +0.098)

+0.040

1.38 (35 –0.025)

2–M10 X 1.25
9.72
2.06 (53) (247)

11.98
3.15 (80) 3.23 (82) 4.92 (304)
(125)
7.16
(182)

3.94 (100)
(2) 1-1/2" NPTF INLET

12MM X 1.75

5.51 (140) 4–Ø16

1.18 (30)
8.98 (228) 8.66 (220)
16.14 (410)

Models 3501, 3501C, 3511, 3511C

4
6

3 5
1 2

1
Special concentric, high-density, polished, 3 100% wet seal design adds to service life by 5 Specially formulated, Cat Pump exclusive,
solid ceramic plungers provide a true wear allowing pumped liquids to cool and lubri- V-Packings offer unmatched performance
surface and extended seal life. cate on both sides. and seal life.
2 Manifolds are high tensile strength 316 4
Stainless steel valves, seats and springs pro- 6 Special Flushed Inlet Manifold permits
stainless steel for long term, continuous vide corrosion-resistance, ultimate seating external flush for adding cooling with high
duty. and extended life. temperature liquids and lubrication with low
lubricity liquids.

CAT PUMPS
1681 - 94TH LANE N.E. MINNEAPOLIS, MN 55449-4324
PHONE (763) 780-5440 — FAX (763) 780-2958
e-mail: techsupport@catpumps.com
www.catpumps.com

For International Inquiries go to www.catpumps.com and navigate to the “Contact Us” link. PN 993011 Rev C 5/13 13267