Product Description
Armstrong Impeller (Cast iron, 1¼" bore) – Part No. 427128-031
Genuine Armstrong replacement impeller, Armstrong part number 427128-031, for Series 4030 pumps. Shown as item 80 on the Series 4030 drawing (parts list 6040.120 / 6040.121 / 6040.122) – highlighted in the pictures above.
* Please confirm before ordering: this number is printed this way in Armstrong’s Series 4030 parts list but looks inconsistent. Call us with your pump serial number to confirm.
- Part number is for an unbalanced, full diameter impeller. Give the pump serial number and measure the old impeller diameter.
Specification: Cast iron, 1¼" bore
Fits these Armstrong pumps
- Series 4030 (base mounted end suction) – pump sizes 3 × 2½ × 8
- Designation: 'M'
- Motor frames: 254T, 256T, 284TS, 286TS, 324TS, 326TS
- Construction: All iron (125#), Ductile iron (250#)
- Drawing item: 80
Other parts for this pump
Rebuilding a Series 4030 3 × 2½ × 8? These parts are often replaced at the same time:
| Item | Part | Armstrong part no. |
|---|---|---|
| 21 | Shaft & sleeve assembly | 426761-001 |
| 21 | Shaft & sleeve assembly | 426761-071 |
| 22 | Inboard bearing | 971101-384 |
| 22 | Inboard bearing | 971101-383 |
| 22 | Inboard bearing | 971101-917 |
| 23 | Outboard bearing | 971101-704 |
| 23 | Outboard bearing | 971101-703 |
| 23 | Outboard bearing | 971101-918 |
| 24 | Lockwasher | 426364-007 |
| 25 | Locknut | 426364-006 |
| 26 | Bearing frame (housing) | 426765-012 |
| 26 | Bearing frame (housing) | 426765-013 |
| 26 | Bearing frame (housing) | 426765-011 |
| 28 | Oil seal (outboard) | 965001-150 |
| 29 | Bearing cover | 426767-011 |
| 29 | Bearing cover | 426767-012 |
| 29 | Bearing cover | 426767-013 |
| 30 | Oil seal (inboard) | 965001-120 |
| 31 | O-ring | 961131-243 |
| 32 | Bearing cover capscrew | 911121-110 |
| 33 | Oil view gauge | 116904-000 |
| 34 | Air vent | 407444-000 |
| 35 | Pipe plug | 937105-200 |
| 36 | Impeller key | 428161-714 |
Showing 24 of 64 parts – see the full list in the parts finder.
Not sure this is the right part?
Use our Armstrong Pump Parts Finder: choose Series 4030, your pump size and motor to see every part on the drawing. Or send us your pump’s nameplate details – call (416) 236-2338 or email sales@bramhambros.com. Bramham Bros is an authorized Armstrong dealer.
