Flygt 3231 Pump Repair Kit — Fits Flygt 3231 and 5560.180

Flygt 3231 Pump Repair Kit — Mechanical Seals & O-Ring Kits

A direct-fit aftermarket repair kit for the Flygt 3231 submersible pump: the 90mm upper mechanical seal, the 75mm lower mechanical seal, and all three O-ring kits this pump takes. Flygt splits the O-rings for the 3231 across three separate kits — every one of them is in this box, so the pump closes up in a single order. Built to OEM-equivalent standards or higher.

What’s included

• Upper mechanical seal, 90mm — ball and drive spring design, metal shell. Replaces Flygt 617 99 02, superseding the older 617 99 04 and 337 77 04

• Lower mechanical seal, 75mm — replaces Flygt 58 612 04

• All three O-ring kits: replaces Flygt 83 05 65, 83 05 94 and 83 21 33

Bearings are not included. Flygt’s own basic repair kit for this pump carries bearings and retaining rings as well; this kit is the sealing set, which is the part that fails.

Applications

• Municipal wastewater and sewage pumping, large lift stations and treatment plants

• Storm water and flood handling

• Raw water and process water transfer, irrigation

• Sludge handling and industrial effluent

• Cooling water duty

The Flygt 3231 is a large submersible wastewater pump, 70 to 215 kW at 50 Hz and 90 to 335 hp at 60 Hz, on a 200mm / 8 in. discharge with a 250mm inlet. It runs four-pole at 1,490 r/min on 50 Hz and 1,790 r/min on 60 Hz, and six-pole at 990 and 1,195 r/min, with a three-blade cast iron impeller and replaceable insert rings. It is built as the N 3231 with the self-cleaning N-impeller and as the C 3231 with the channel impeller. The same 90mm upper seal is the part Flygt uses across much of its large-pump range, which is why this one also carries the 3300, the 7050 propeller pump and the 5560.180 sewage pump.

Nameplates read N 3231 or C 3231 with an installation prefix — NP, NS, NT or NZ on the N-pump, CP, CS, CT or CZ on the C-pump — and a drive unit number. On the four-pole machines those are 605 35-29-4AA, 665 35-35-4AA, 665 35-45-4AA, 705 43-30-4AA, 735 43-44-4AA and 765 43-56-4AA; on the six-pole, 605 35-29-6AA, 665 35-35-6AA and 665 35-45-6AA. Curve codes are 53-470 at 50 Hz and 63-470 or 63-670 at 60 Hz.

Flygt built the 3231 in more than one seal generation — this kit is the ball-and-drive-spring metal shell design. So enter your full model number and the drive unit number under Pump Model Notes at checkout and we check both before we pack. Easiest way: text a photo of the dataplate to 561-414-1046 and we will read them off it for you, no purchase required.

Rebuilding one of the other large Flygt pumps? See the Flygt 3306, Flygt 3356 and Flygt 3300 repair kits — they share seal parts with this one but each takes its own O-ring set.

Browse our full line of Flygt pump repair kits, or the complete range of pump repair kits, mechanical shaft seals and OEM replacement seals by brand. Call us anytime at 561-414-1046.