Datasheet Content
WS251
TECHNICAL INFORMATION
Flow (L/min) 15
Flow (US Gpm) 3,96
Rotation regime (rpm) 1450
Pressure (MPa) 25
Pressure (bar) 250
Pressure (psi) 3625
Power (hp) 10
Power (kW) 7,35
Overall dimensions L x l x h (mm) 317,5x236x180
Weight (kg) 14,5
WS251 3/21/2026 Page 1 - 8
Copyright INTERPUMP GROUP S.P.A
WS251
Documents
Male shaft (key)
Male shaft (key) - vers. ATEX
WS251 3/21/2026 Page 2 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key)
WS251 3/21/2026 Page 3 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key)
Pos. Code Description Qty Notes
KIT71 34007101 KIT 71 INTERMEDIATE RING 1
D.20
KIT7 34000701 KIT 7 HEAD RING D.20 1
KIT69 34006901 KIT 69 PACKING D.20 W/RESTOP 1
KIT6 34000601 KIT 6 PISTON BOLT 1
KIT3 34000301 KIT 3 OIL SEAL D.30X55X7 1
KIT28 34002801 KIT 28 COMPL.SEAL FOR 1
PIST.D20
KIT2 34000201 KIT 2 OIL SEAL D. 22X32X5,5 1
KIT10 34001001 KIT 10 PACKING RETAINER D.20 1
KIT1 34000101 KIT 1 INTAKE/DELIVERY VALVE 1
55 90270500 PACKING 20x35x7,5 3
54 96738000 WASHER 17,5X23X1,5 1
53 98210000 PLUG G3/8X13 1
52 96751400 WASHER 21,5X27X1,5 1
51 98217600 PLUG G1/2X10 1
50 96710600 WASHER 10,2 4
49 99364400 SCREW M 10x18-5931 4
48 47200074 PUMP FOOT 2
47 90270400 RESTOP RING D. 20 TYPE 6/1 3
46 47216970 INTERM.RING D. 20 (SPEC.) 3
45 47100051 HEAD RING D. 20 3
44 90271000 PACKING D.20X35X9 L.P. 3
43 47080570 PACKING RETAINER D. 20x35 3
42 90361600 O-RING 34,65X1,78 (2137) 3
41 90164800 OIL SEAL 30x55x7 1
40 97567800 SHIM D.74,5X104X0,1 1
40 97568000 SHIM D.74.5X104X0.3 1
39 47151022 OPEN SIDE COVER (47-66) 1
38 47219566 PISTON SCREW 3
37 96728000 WASHER 14X18,5X0,5 3
36 90506700 ANTI-EXTRUSION RING 3
35 47040409 PISTON D. 20x50 3
34 96728600 WASHER 14X28X0,5 3
32 99309900 SCREW M 8x35 UNI 5931 6
31 90358500 O-RING 10,82X1,78 (2043) 4
30 98204250 PLUG G1/4"x12 1
29 47221301 OIL SIGHT GLASS ASSY G3/4 1
WS251 3/21/2026 Page 4 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key)
Pos. Code Description Qty Notes
28 47160622 CRANKCASE COVER 1
27 99188400 SCREW M 6x20 UNI 5931 5
26 47030001 CONNECTING ROD 3
25 47050466 PISTON GUIDE - S.S. 3
24 97738000 CONNECTING-ROD PIN 3
D.13X35,5
23 91489000 KEY 8X7X35 1
22 90055700 CIRCLIP D.12 UNI 7435 6
21 47021835 CRANKSHAFT C.12 S.p.f. U.S. 1
20 90392200 O-RING D.133.02X 2,62(3525) 1
19 98210600 OIL DIP-STICK G3/8X80 1
18 47010822 CRANKCASE 1
17 90912600 BUSHING 22X25X30 3
16 90162500 OIL SEAL 22x32x5 3
15 91837800 TAPER BEARING 32206 SKF 2
14 90391300 O-RING 67,95X2,62 (3268) 2
13 47151122 CLOSED SIDE COVER (47-66) 1
12 99303900 SCREW M 8x16 UNI 5931 8
11 36703201 VALVE ASSY. 6
10 98222800 PLUG M24x1,5x17,5 6
9 90384700 O-RING 20,29X2,62(3081) 6
8 36200251 VALVE CAGE 6
7 94737600 SPRING D. 9,4X14,8 6
6 36200176 VALVE PLATE 6
5 36200366 VALVE SEAT 6
4 90384100 O-RING 17,12X2,62 (3068) 6
2 99320600 HEX-HEAD SCREW M08X70 8
UNI5737 10.9 Fe/Zn5c1A+De
1 47121741 MANIFOLD 1
WS251 3/21/2026 Page 5 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key) - vers. ATEX
WS251 3/21/2026 Page 6 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key) - vers. ATEX
Pos. Code Description Qty Notes
KIT71 34007101 KIT 71 INTERMEDIATE RING 1
D.20
KIT7 34000701 KIT 7 HEAD RING D.20 1
KIT69 34006901 KIT 69 PACKING D.20 W/RESTOP 1
KIT6 34000601 KIT 6 PISTON BOLT 1
KIT3 34000301 KIT 3 OIL SEAL D.30X55X7 1
KIT28 34002801 KIT 28 COMPL.SEAL FOR 1
PIST.D20
KIT2 34000201 KIT 2 OIL SEAL D. 22X32X5,5 1
KIT10 34001001 KIT 10 PACKING RETAINER D.20 1
KIT1 34000101 KIT 1 INTAKE/DELIVERY VALVE 1
60 99180900 SCREW M06X10 5931 A2-70 1
59 96693950 WASHER 6.4x11.0x0.7 D6798A 1
INOX
58 90387700 O-RING 39,34X2,62 (3156) 1
57 70211751 1
56 90075500 STOP RING J45 UNI7437 1
55 90270500 PACKING 20x35x7,5 3
54 96738000 WASHER 17,5X23X1,5 1
53 98210000 PLUG G3/8X13 1
52 96751400 WASHER 21,5X27X1,5 1
51 98217600 PLUG G1/2X10 1
50 96710600 WASHER 10,2 4
49 99364400 SCREW M 10x18-5931 4
48 47200074 PUMP FOOT 2
47 90270400 RESTOP RING D. 20 TYPE 6/1 3
46 47216970 INTERM.RING D. 20 (SPEC.) 3
45 47100051 HEAD RING D. 20 3
44 90271000 PACKING D.20X35X9 L.P. 3
43 47080570 PACKING RETAINER D. 20x35 3
42 90361600 O-RING 34,65X1,78 (2137) 3
41 90164800 OIL SEAL 30x55x7 1
40 97567800 SHIM D.74,5X104X0,1 1
40 97568000 SHIM D.74.5X104X0.3 1
39 47151022 OPEN SIDE COVER (47-66) 1
38 47219566 PISTON SCREW 3
37 96728000 WASHER 14X18,5X0,5 3
36 90506700 ANTI-EXTRUSION RING 3
WS251 3/21/2026 Page 7 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key) - vers. ATEX
Pos. Code Description Qty Notes
35 47040409 PISTON D. 20x50 3
34 96728600 WASHER 14X28X0,5 3
32 99309900 SCREW M 8x35 UNI 5931 6
31 90358500 O-RING 10,82X1,78 (2043) 4
30 98203600 PLUG G1/4x8 FOR PROBE D.6 1
S.S.
29 98226600 PLUG G3/4X16 S.S. 1
28 47160622 CRANKCASE COVER 1
27 99188400 SCREW M 6x20 UNI 5931 5
26 47030001 CONNECTING ROD 3
25 47050466 PISTON GUIDE - S.S. 3
24 97738000 CONNECTING-ROD PIN 3
D.13X35,5
23 91489000 KEY 8X7X35 1
22 90055700 CIRCLIP D.12 UNI 7435 6
21 47021735 CRANKSHAFT C.16 S.p.f. U.S. 1
21 47021835 CRANKSHAFT C.12 S.p.f. U.S. 1
20 90392200 O-RING D.133.02X 2,62(3525) 1
19 98210700 OIL DIPSTICK G3/8X64 1
D4+FILTER ATEX
18 47010822 CRANKCASE 1
17 90912600 BUSHING 22X25X30 3
16 90162500 OIL SEAL 22x32x5 3
15 91837800 TAPER BEARING 32206 SKF 2
14 90391300 O-RING 67,95X2,62 (3268) 2
13 47151322 SIDE CRANKCASE COVER (ATEX) 1
12 99303900 SCREW M 8x16 UNI 5931 8
11 36703201 VALVE ASSY. 6
10 98222800 PLUG M24x1,5x17,5 6
9 90384700 O-RING 20,29X2,62(3081) 6
8 36200251 VALVE CAGE 6
7 94737600 SPRING D. 9,4X14,8 6
6 36200176 VALVE PLATE 6
5 36200366 VALVE SEAT 6
4 90384100 O-RING 17,12X2,62 (3068) 6
2 99320600 HEX-HEAD SCREW M08X70 8
UNI5737 10.9 Fe/Zn5c1A+De
1 47121741 MANIFOLD 1
WS251 3/21/2026 Page 8 - 8
Copyright INTERPUMP GROUP S.P.A
