Datasheet Content
WK5021
TECHNICAL INFORMATION
Flow (L/min) 21
Flow (US Gpm) 5,55
Rotation regime (rpm) 1450
Pressure (MPa) 50
Pressure (bar) 500
Pressure (psi) 7250
Power (hp) 28
Power (kW) 20,59
Overall dimensions L x l x h (mm) 350x243x187,5
Weight (kg) 21,5
WK5021 3/21/2026 Page 1 - 8
Copyright INTERPUMP GROUP S.P.A
WK5021
Documents
Male shaft (key)
Male shaft (key) - Flushing
WK5021 3/21/2026 Page 2 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key)
WK5021 3/21/2026 Page 3 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key)
Pos. Code Description Qty Notes
KIT3 34000301 KIT 3 OIL SEAL D.30X55X7 1
KIT2 34000201 KIT 2 OIL SEAL D. 22X32X5,5 1
KIT180 34018001 KIT 180 SEALS D. 18 1
KIT176 34017601 KIT176 COMPLETE SEALS D.18 1
KIT150 34015001 KIT 150 INTAKE/DEL.VALVE 1
61 47151022 OPEN SIDE COVER (47-66) 1
60 91489200 KEY 8(h9)X7X35 UNI 6604/A 1
59 66020035 CRANKSHAFT C.19 - D. 24 1
58 90164800 OIL SEAL 30x55x7 1
57 99188400 SCREW M 6x20 UNI 5931 4
56 90391300 O-RING 67,95X2,62 (3268) 2
55 47151222 SIDE CRANKCASE COVER FOR 1
OIL GAUGE
54 91838000 ROLLER BEARING NJ2206EC 2
53 90387700 O-RING 39,34X2,62 (3156) 1
52 70211801 OIL SIGHT GLASS 1
51 90075600 CIRCLIP D.45 (ZJ45) 1
50 99303900 SCREW M 8x16 UNI 5931 8
49 66050066 PISTON GUIDE - S.S. 3
48 90162500 OIL SEAL 22x32x5 3
47 90912600 BUSHING 22X25X30 3
46 66010022 CRANKCASE 1
45 99309900 SCREW M 8x35 UNI 5931 6
44 98210600 OIL DIP-STICK G3/8X80 1
43 90392200 O-RING D.133.02X 2,62(3525) 1
42 66160022 REAR COVER 1
41 47200074 PUMP FOOT 2
40 96710600 WASHER 10,2 1
39 98204250 PLUG G1/4"x12 1
38 99364400 SCREW M 10x18-5931 1
37 97740500 CONNECTING ROD-PIN D.14X39 3
36 66030001 CONNECTING ROD 3
35 96710100 WASHER D. 10X28X0.5 3
34 90358500 O-RING 10,82X1,78 (2043) 1
33 66080370 PACKING RETAINER D.18 3
32 90361600 O-RING 34,65X1,78 (2137) 3
31 90265200 SEAL D.18X26X6,5 L.P. 3
30 66216370 INTERMEDIATE RING D. 18 3
WK5021 3/21/2026 Page 4 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key)
Pos. Code Description Qty Notes
29 90265500 PACKING 18.0x28x10.0 HP 3
66
28 66040309 PISTON D.18X54 3
27 90358400 O-RING D.10,82X1,78(2043)90SH 3
26 66219566 PISTON BOLT 3
25 93185800 1
24 98209900 PLUG G. 3/8X13 NICKEL 1
23 98217900 PLUG G 1/2X10 NICKEL 1
22 96751400 WASHER 21,5X27X1,5 1
21 99382000 8
20 66210166 3
19 90511500 ANTI-EXTRUSION RING 3
18 90384300 O-RING 17,86X2,62 (123) 3
17 99368700 8
16 66220336 1
15 66210070 3
14 90516500 ANTI-EXTR.RING D.24.7x29x1.5 3
13 90385700 O-RING 23,81X2,62 (132) 6
12 36712101 INTAKE/DELIVERY VALVE 6
11 36202551 VALVE CAGE 6
10 94737600 SPRING D. 9,4X14,8 6
9 36203266 SPHERICAL VALVE 6
8 36200366 VALVE SEAT 6
7 90384100 O-RING 17,12X2,62 (3068) 6
6 90359600 3
5 90511800 3
4 66210270 3
3 98197200 PLUG G1/8X8 S.S. 3
2 90357600 3
1 66124936 1
WK5021 3/21/2026 Page 5 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key) - Flushing
WK5021 3/21/2026 Page 6 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key) - Flushing
Pos. Code Description Qty Notes
KIT3 34000301 KIT 3 OIL SEAL D.30X55X7 1
KIT2 34000201 KIT 2 OIL SEAL D. 22X32X5,5 1
KIT180 34018001 KIT 180 SEALS D. 18 1
KIT176 34017601 KIT176 COMPLETE SEALS D.18 1
KIT150 34015001 KIT 150 INTAKE/DEL.VALVE 1
61 47151022 OPEN SIDE COVER (47-66) 1
60 91489200 KEY 8(h9)X7X35 UNI 6604/A 1
59 66020035 CRANKSHAFT C.19 - D. 24 1
58 90164800 OIL SEAL 30x55x7 1
57 99188400 SCREW M 6x20 UNI 5931 4
56 90391300 O-RING 67,95X2,62 (3268) 2
55 47151222 SIDE CRANKCASE COVER FOR 1
OIL GAUGE
54 91838000 ROLLER BEARING NJ2206EC 2
53 90387700 O-RING 39,34X2,62 (3156) 1
52 70211801 OIL SIGHT GLASS 1
51 90075600 CIRCLIP D.45 (ZJ45) 1
50 99303900 SCREW M 8x16 UNI 5931 8
49 66050066 PISTON GUIDE - S.S. 3
48 90162500 OIL SEAL 22x32x5 3
47 90912600 BUSHING 22X25X30 3
46 66010022 CRANKCASE 1
45 99309900 SCREW M 8x35 UNI 5931 6
44 98210600 OIL DIP-STICK G3/8X80 1
43 90392200 O-RING D.133.02X 2,62(3525) 1
42 66160022 REAR COVER 1
41 47200074 PUMP FOOT 2
40 96710600 WASHER 10,2 1
39 98204250 PLUG G1/4"x12 1
38 99364400 SCREW M 10x18-5931 1
37 97740500 CONNECTING ROD-PIN D.14X39 3
36 66030001 CONNECTING ROD 3
35 96710100 WASHER D. 10X28X0.5 3
34 90358500 O-RING 10,82X1,78 (2043) 1
33 66080370 PACKING RETAINER D.18 3
32 90361600 O-RING 34,65X1,78 (2137) 3
31 90265200 SEAL D.18X26X6,5 L.P. 3
30 66220570 3
WK5021 3/21/2026 Page 7 - 8
Copyright INTERPUMP GROUP S.P.A
Illustration Male shaft (key) - Flushing
Pos. Code Description Qty Notes
29 90265500 PACKING 18.0x28x10.0 HP 3
66
28 66040309 PISTON D.18X54 3
27 90358400 O-RING D.10,82X1,78(2043)90SH 3
26 66219566 PISTON BOLT 3
25 93185800 1
24 98209900 PLUG G. 3/8X13 NICKEL 1
23 98217900 PLUG G 1/2X10 NICKEL 1
22 96751400 WASHER 21,5X27X1,5 1
21 99382000 8
20 66210166 3
19 90511500 ANTI-EXTRUSION RING 3
18 90384300 O-RING 17,86X2,62 (123) 3
17 99368700 8
16 66220336 1
15 66210070 3
14 90516500 ANTI-EXTR.RING D.24.7x29x1.5 3
13 90385700 O-RING 23,81X2,62 (132) 6
12 36712101 INTAKE/DELIVERY VALVE 6
11 36202551 VALVE CAGE 6
10 94737600 SPRING D. 9,4X14,8 6
9 36203266 SPHERICAL VALVE 6
8 36200366 VALVE SEAT 6
7 90384100 O-RING 17,12X2,62 (3068) 6
6 90359600 3
5 90511800 3
4 66210270 3
3 98197200 PLUG G1/8X8 S.S. 3
2 90357600 3
1 66125136 1
WK5021 3/21/2026 Page 8 - 8
Copyright INTERPUMP GROUP S.P.A
