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Dayton pump repair kit in clear bag showing gaskets, bolts, impeller and seal components

Dayton

Dayton 21TG50 Pump Repair Kit for 2ZWR5, 2ZWR6

SKU CH-ADXC-GCPDJ

Repair kit for Dayton straight-centrifugal pumps 2ZWR5 and 2ZWR6, includes mechanical seal, impeller with lock nut, O-ring, shims and hardware

  • Repair kit restores Dayton pump performance with genuine replacement parts
  • Nitrile rubber gaskets resist oil and chemical exposure in centrifugal applications
  • Mechanical seal and O-ring prevent fluid leakage under operating pressure
  • Impeller with lock nut and shim kit maintains correct rotor alignment
  • Includes sixteen assorted bolts and lockwashers for complete hardware replacement

Pump Repair Kit for Dayton 2ZWR5 and 2ZWR6

This Dayton 21TG50 repair kit is designed for straight centrifugal pumps used in plumbing and fluid transfer applications. It provides the components needed to service compatible Dayton 2ZWR5 and 2ZWR6 pump models. The kit suits maintenance professionals and facility teams performing scheduled overhauls or addressing seal wear. It is not intended for pumps outside the listed manufacturer model numbers.

Gasket Material and Included Hardware

The kit includes a mechanical seal and an O-ring manufactured from nitrile rubber for fluid compatibility. Fasteners supplied are four 3/8 in lockwashers, four 3/8 in -16 x 1 in bolts, four 5/16 in -18 hex head bolts and four additional lockwashers. An impeller shim kit and an impeller with lock nut are also provided. These parts support reassembly without sourcing separate hardware.

Sustained Service Use

Under continuous operation the nitrile rubber seals maintain their sealing properties through repeated thermal cycles. The supplied impeller and shim kit allow precise clearance setting to preserve hydraulic efficiency over long periods. The hardware is sized for the specified pump models to ensure consistent clamping force. The product carries California Proposition 65 warnings for cancer and reproductive harm.

Highlights

  • Repair kit restores Dayton pump performance with genuine replacement parts
  • Nitrile rubber gaskets resist oil and chemical exposure in centrifugal applications
  • Mechanical seal and O-ring prevent fluid leakage under operating pressure
  • Impeller with lock nut and shim kit maintains correct rotor alignment
  • Includes sixteen assorted bolts and lockwashers for complete hardware replacement

Specifications

BrandDAYTON

Questions about this item

How do I install the mechanical seal in the Dayton 21TG50 kit, and which step do people usually miss?

Press the seal squarely into the housing using even pressure, then fit the impeller with its lock nut before torquing the 3/8 in -16 bolts; the step most often missed is seating the seal faces perfectly flat before tightening.

Which parts in this kit will need replacement again after normal service?

The nitrile rubber gasket, O-ring and mechanical seal are wear items that degrade with heat and chemical exposure; the impeller shim set and lock nut may also need renewal if clearances change.

What is the first limit that appears when the repaired pump runs continuously?

The nitrile rubber seal and gasket reach their temperature ceiling first; prolonged heat hardens the material and causes leakage before the metal hardware shows wear.

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