Grundfos 19/16mm Complete Shaft Coupling Kit for CR CRN UMT UPT Pumps 339119 #5151

Grundfos 19/16mm Complete Shaft Coupling Kit for CR / CRN / UMT / UPT Pumps – 339119 – #5151

Genuine Grundfos complete shaft coupling kit 339119 for selected CR, CRN, UMT and UPT pumps requiring the manufacturer's 19mm motor-shaft / 16mm pump-shaft coupling. The kit contains two coupling halves, four fixing screws and one shaft pin, forming one complete coupling assembly.

This split coupling connects the motor shaft to the pump shaft to transmit the drive. Grundfos identifies the version as sintered metal and gives the specification COUPLING CPL. D19/D16. Its CRK service catalogue lists a coupling length of 51mm for this part number.

The service catalogues also identify selected CRK, CRT, UMTD and UPTD applications. Compatibility depends on the pump version and fitted motor. Use the exact pump product number, production code and specified coupling part number to confirm suitability.

Product Details

Manufacturer-Specified Kit Contents

Grundfos lists the following components for 339119. Position numbers refer to the manufacturer's service drawings.

*The coupling halves are position 10a in the kit/CRK/CRT records and position 8 in the UMT/UPT service catalogue. These are drawing references for the same type of component, not additional halves.

The manufacturer's contents list does not include a coupling guard, motor, pump shaft, mechanical shaft seal, bearings or pump gaskets. Please check the listing photographs for the actual supplied components.

Compatibility Guidance

19/16mm means motor shaft / pump shaft, in that order. It does not describe pipe connections, the coupling's outside diameter or two interchangeable shaft sizes.

Confirm 339119 in the service selection for the exact pump and production version. Coupling length, motor shaft projection and the existing shaft arrangement also matter. A pump that has had a replacement motor fitted may need a different coupling from its original specification.

Grundfos lists 339169 separately as a 19/16mm coupling with an 82mm catalogue length. It also lists 96511317 as a separate 19/16mm coupling for CR/CRI/CRN 10, 15 and 20 applications. Matching shaft diameters alone does not establish interchangeability with this 51mm 339119 kit.

Frequently Asked Questions

What does this shaft coupling do?

It joins the motor shaft to the pump shaft so the motor can drive the pump. The two metal halves clamp around the specified shaft arrangement, using the fixing screws and shaft pin shown in the kit contents.

What do the 19mm and 16mm measurements refer to?

Grundfos gives these dimensions as motor-shaft diameter followed by pump-shaft diameter: 19mm motor side and 16mm pump side. Both must match the intended arrangement. Measure the actual shafts and confirm the manufacturer's part selection.

Does “complete coupling” mean two couplings are supplied?

No. The two halves form one complete coupling. The kit also includes four screws and one shaft pin. This listing is for one service kit.

Are the fixing screws and pin included?

Yes. Grundfos's kit record specifies four M6 × 20mm DIN 912 socket-head screws and one 5 × 26mm shaft pin, alongside the two coupling halves. Check the photographs for the actual supplied components.

Does it include a coupling guard or shaft seal?

No. Neither appears in the manufacturer's contents list. A damaged guard or leaking mechanical seal needs its own correctly selected replacement parts. Refit the correct guard before returning the pump to service.

What material is the coupling made from?

Grundfos describes this version as sintered metal. The published part specification does not identify it as a stainless-steel coupling, so stainless construction should not be assumed.

Is this a flexible coupling with a rubber insert?

The supplied design uses two metal coupling halves, screws and a pin. No rubber spider or flexible insert is listed. It should not be selected as a flexible coupling to compensate for an incorrect motor or shaft arrangement.

Will it fit every CR or CRN pump?

No. Grundfos's catalogue includes it among the coupling options for the older CR/CRN 8 and 16 ranges. These ranges also use other motor-shaft sizes and coupling kits. Match the individual product number and production version; the CR or CRN name alone is insufficient.

Will it fit UMT, UPT and twin-head UMTD or UPTD pumps?

Grundfos lists 339119 as the 19/16mm option in its UMT/UPT and UMTD/UPTD coupling tables. These tables also contain other metric and NEMA sizes. Confirm the actual shafts and service selection. One kit provides one coupling, so it does not automatically service both heads of a twin-head pump.

Can it also be used on CRK and CRT pumps?

The CRK catalogue lists it for selected CRK 8 and CRK 16 arrangements. The CRT catalogue includes it in selected CRT 8 and CRT 16 coupling tables. Those references remain subject to motor size and pump version; they are not blanket approval for every CRK or CRT pump.

Is 339119 the same as 339169?

No. Although both are catalogued with 19/16mm shaft diameters, Grundfos lists 339119 at 51mm long and 339169 at 82mm long. Select the specified kit rather than substituting on diameter alone.

Can I use it instead of 96511317 on a CR/CRI/CRN 10, 15 or 20?

Do not assume so. Grundfos lists 96511317 separately for the 19/16mm coupling in those ranges. An identical pair of nominal shaft diameters does not confirm that the coupling length and assembly arrangement are the same.

Does the motor power or voltage tell me which coupling to order?

Neither is a sufficient selection method. Motors with different frames, shaft sizes or shaft projections can be fitted to related pump models. This mechanical kit has no supply-voltage requirement, but it must suit the actual motor and pump shafts.

What if the pump has had a replacement motor fitted?

Check the current motor nameplate and shaft dimensions as well as the pump's original product number. A changed motor can alter the required shaft diameter or coupling length. Send photographs of both nameplates and the existing coupling if you need help checking the arrangement.

Will a new coupling cure noise, vibration or a pump that will not turn?

It may address a worn or damaged coupling when that is the cause. The shafts, pin locations, bearings and pump rotating assembly also need inspection. A replacement coupling does not correct a seized pump, damaged shaft or incorrectly assembled motor connection.

Can I replace just one coupling half?

This listing supplies both halves as a complete kit. Use the specified complete assembly and inspect the mating shafts. Mixing an old worn half with a new one, or combining halves from different coupling kits, is not a substitute for confirming the correct assembly.

What tightening torque and shaft setting should be used?

Follow the service instructions for the exact pump and production version. The presence of M6 screws alone does not establish the correct torque, assembly sequence or axial shaft setting. A competent pump engineer should carry out the work with the equipment isolated and use the specified adjustment procedure.

Why are some Grundfos model names repeated with different numbers?

A short model name can cover several product variants. The eight-digit number beneath each name identifies the individual pump record. Where Grundfos publishes only a short name, it is retained without inventing extra type-code letters.

My pump is not in the list below. Does that mean the kit cannot fit?

No. The list records the individual matches verified for this description, and older or special pump versions may not have a complete online service record. The catalogue applications provide additional guidance. Please send the full nameplate details so the correct coupling can be checked.

Which number should I quote when ordering?

339119 is the Grundfos kit number, and #5151 is our stock reference. Some Grundfos service records display the same kit as 00339119. The eight-digit numbers beneath pump names in the compatibility list identify the pumps being serviced.

Manufacturer Documentation

• Grundfos Product Center – Coupling Kit 339119 – part specification, material/version, EAN and service-parts contents.
• Grundfos UK Spares & Repair Kits Catalogue – page 16: CR/CRN coupling options; pages 29–31: LM/LP/NM/NP-related ranges, UMT/UPT and TP coupling selections.
• Grundfos CRK / CRKI Service Kit Catalogue – PDF pages 7 and 9: CRK 8 and 16 coupling dimensions and kit contents.
• Grundfos CR / CRT Service Kit Catalogue – PDF pages 9, 11 and 16: applicable CRT coupling tables and production-version distinctions.
• Grundfos UMT / UMTD / UPT / UPTD Service Kit Catalogue – PDF pages 1 and 3: 19/16mm coupling selection and contents.

Delivery & Shipping

• Free UK shipping.
• Next working day dispatch available – order before 4pm.
• Same-day courier options are available; please telephone for a quotation.
• International shipping is available, with the shipping cost confirmed after checkout.

About Our Stock

The Pump Dealer supplies new and unused surplus pumps, motors and replacement parts. Surplus packaging may show signs of storage or handling. This item is supplied with our 2-year dealer guarantee. Please quote Grundfos 339119 / stock reference #5151 when enquiring.

Catalogue Applications

The following Grundfos catalogues include 339119 as a coupling option. Each application requires the specified 19mm motor shaft, 16mm pump shaft and correct coupling arrangement. A family entry does not confirm every model or motor combination in that range.

Verified Pump Product-Number References

The 19 references below have individual Grundfos service-parts records listing 339119 / 00339119. The manufacturer model name is followed by the pump's eight-digit product number. Repeated model names represent separate product variants.

Production-version check: The service-list labels shown beneath each reference identify the records in which this kit was found. Their four-digit codes use the manufacturer's year/week format. Select the service list matching your pump's production code and current motor; a match in one historical list does not confirm every later version. Click a model name to open its Grundfos product page.

CR – 9 references

• Grundfos CR 8-20
  42277002
  Service-list labels: Produced After 0314; Produced After 9323.
• Grundfos CR 8-20
  42507102
  Service-list labels: Produced After 0314; Produced After 9323.
• Grundfos CR 8-30
  42277003
  Service-list labels: Produced After 0314; Produced After 9323.
• Grundfos CR 8-30
  42500003
  Service-list labels: Produced After 9323.
• Grundfos CR 8-30
  42507103
  Service-list labels: Produced After 0314; Produced After 9323.
• Grundfos CR 8-30
  42507203
  Service-list labels: Produced After 0314; Produced After 9323.
• Grundfos CR 8-30
  42530003
  Service-list labels: Produced After 9323.
• Grundfos CR 8-30
  42557103
  Service-list labels: Produced After 0314; Produced After 9323.
• Grundfos CR 8-30
  42680003
  Service-list labels: Produced After 9323.

CR – pump supplied without motor – 1 reference

Grundfos identifies this product as a pump supplied without a motor. Its service list includes 339119, but the coupling must also match the motor actually fitted.

• Grundfos CR 8-30
  42550003
  Service-list labels: Produced After 9323.

CRK – 2 references

• Grundfos CRK 8-30/1 A-W-A
  42900682
  Service-list labels: Produced After 9344.
• Grundfos CRK 8-30/1 A-W-A-AUUV
  42900882
  Service-list labels: Produced After 1002; Produced After 0314; Produced After 9344.

CRN – 7 references

• Grundfos CRN 8-20
  42330002
  Service-list labels: Produced After 9323.
• Grundfos CRN 8-20
  42797102
  Service-list labels: Produced After 0314; Produced After 9323.
• Grundfos CRN 8-30
  42337003
  Service-list labels: Produced After 0314; Produced After 9323.
• Grundfos CRN 8-30
  42390003
  Service-list labels: Produced After 9323.
• Grundfos CRN 8-30
  42630003
  Service-list labels: Produced After 9323.
• Grundfos CRN 8-30
  42640003
  Service-list labels: Produced After 9323.
• Grundfos CRN 8-30
  42800003
  Service-list labels: Produced After 9323.

Scope of this list: These are the exact pump references verified from the available manufacturer service records. They are not an exhaustive list of all historical, regional, special-build or modified pumps. Further catalogue applications, including UMT/UPT and their twin-head versions, require a nameplate check where an individual product number is not shown. Please contact us with your pump details for help matching the correct coupling.