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Company News · Model reference guide

National JWS-340 Mud Pump Spare Parts

Published by Pratt Oil ·

Pratt OilParts identification
National JWS-340 source expendables reference table

The National JWS-340 list includes MK-0240-44 for a nominal 4.5-inch liner, with separate piston and valve components. Keep the liner size and fitted piston construction together when identifying replacement items. For a quotation, send the part or drawing number, quantity, pump model and nameplate photo.

Parts List

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34 parts

P/PPart / Drawing No.NamePart / Drawing No.Name
1MK-0240-30Liner, nominal size 3''MK-I30HA10Imperial Piston; nominal piston size 3''
2MK-1712064Liner Packing, nominal size 3''MK-I30HAImperial Rubber Kits; nominal piston size 3''
3MK-0240-34Liner, nominal size 3½''MK-I34HK10Imperial Piston; nominal piston size 3½''
4MK-1712064Liner Packing, nominal size 3½''MK-I34HKImperial Rubber Kits; nominal piston size 3½''
5MK-0240-40Liner, nominal size 4''MK-RT-400-10Red Thunder Bonded Pistons; nominal piston size 4''
6MK-1712064Liner Packing, nominal size 4''MK-I40HK10Imperial Piston; nominal piston size 4''
7MK-0240-44Liner, nominal size 4½''MK-RB-400-10Rubber Bonded; nominal piston size 4''
8MK-1712064Liner Packing, nominal size 4½''MK-LL-400-10Long Life (Urethane); nominal piston size 4''
9MK-1718265Gasket; source model JWS340MK-RT-440-10Red Thunder Bonded Pistons; nominal piston size 4½''
10MK-1561575VALVE (Urethane Insert); suctionMK-I44HK10Imperial Piston; nominal piston size 4½''
11MK-1561575VALVE (Urethane Insert); dischargeMK-I44HKImperial Rubber Kits; nominal piston size 4½''
12MK-1561571VALVE SEAT; suctionMK-RB-440-10Rubber Bonded; nominal piston size 4½''
13MK-1561572VALVE SEAT; dischargeMK-LL-440-10Long Life (Urethane); nominal piston size 4½''
14MK-1712211VALVE SPRING; suctionMK-0238Piston Rod; one piece
15MK-1712206VALVE SPRING; dischargeMK-16-0238Extension Rod; one piece
16MK-1561577VALVE INSERT (Urethane); suctionMK-24-0238Rod Clamp; one piece
17MK-1561577VALVE INSERT (Urethane); dischargeMK-7403224Piston Rod Nut; one piece
Technical details and source references

Confirm the installed model, drawing revision and dimensions before ordering. Catalogue quantities do not indicate current stock.

Reference documents and scope

  • S1 — Mud King Products, Mud Pump Expendables / Triplex Fluid End Parts (source catalogue edition undated). Reference file: EMSCO-MK-美国泥浆泵.pdf.

PDF page numbers count from the first page of each reference file. Brand names identify the equipment or catalogue source. A listed number does not establish interchangeability, original-manufacturer authorisation, stock or a delivery commitment. Send the nameplate, complete reference, quantity and drawing revision for a parts review.

For a National JWS-340 mud pump parts enquiry, the complete component reference is more useful than the pump model alone. The Mud King Products catalogue separates expendable parts by nominal size, component family and installed arrangement. This guide transcribes the identifiable supplier-number entries associated with National JWS-340, with their original page and table context, so a buyer can assemble a clearer maintenance RFQ.

Model-Specific Gasket and Valve-Position Matching

The jointly headed JWS165/340 sheet gives MK-1718265 specifically beside JWS340 in the gasket box. That explicit distinction should remain in a parts request even though the liner and valve tables occupy the same page. The liner series is MK-0240 and the packing column shows MK-1712064 for the listed sizes.

Suction spring MK-1712211 and discharge spring MK-1712206 occupy different columns in the MKP-G2 table. The corresponding seat references are MK-1561571 and MK-1561572. Include the suction or discharge position in each RFQ line. The original one-piece rod entry is MK-0238; its extension rod, clamp and nut are separate references, not a declaration that all rod-related pieces are included.

Read the catalogue reference correctly

The accompanying reference list covers the identifiable number-bearing cells in the relevant source tables, not a complete original-manufacturer bill of materials. MK and MKG identify supplier catalogue references; their prefixes, punctuation and combined suffixes are retained. A value marked N/A or left blank is not replaced by an invented number. A shared model heading records the catalogue scope and does not by itself confirm interchangeability on an individual pump.

Information to send for parts matching

Send the pump nameplate and serial number, full reference including its prefix, required quantity and a photograph of the installed or removed component. For liners and pistons, add the nominal size and sealing arrangement. For fluid-end hardware, identify the module configuration and whether an individual component or a studded assembly is required. Keep any original equipment drawing number as a separate field rather than stripping the supplier prefix to assume an OEM match.

Review mud pump spare parts matching, compare liners, pistons, valves and seats, or send Pratt Oil a parts list for review. Matching and availability require confirmation; these references do not establish authorisation, inventory or a delivery promise.

  1. MK-0240-30 — S1 , PDF p. 29 — Liners and liner packing; source row 3''; Mud King supplier catalogue number
  2. MK-1712064 — S1 , PDF p. 29 — Liners and liner packing; source row 3''; Mud King supplier catalogue number
  3. MK-0240-34 — S1 , PDF p. 29 — Liners and liner packing; source row 3½''; Mud King supplier catalogue number
  4. MK-1712064 — S1 , PDF p. 29 — Liners and liner packing; source row 3½''; Mud King supplier catalogue number
  5. MK-0240-40 — S1 , PDF p. 29 — Liners and liner packing; source row 4''; Mud King supplier catalogue number
  6. MK-1712064 — S1 , PDF p. 29 — Liners and liner packing; source row 4''; Mud King supplier catalogue number
  7. MK-0240-44 — S1 , PDF p. 29 — Liners and liner packing; source row 4½''; Mud King supplier catalogue number
  8. MK-1712064 — S1 , PDF p. 29 — Liners and liner packing; source row 4½''; Mud King supplier catalogue number
  9. MK-1718265 — S1 , PDF p. 29 — Model-specific gasket; Mud King supplier catalogue number
  10. MK-1561575 — S1 , PDF p. 29 — MKP-G2; suction; Mud King supplier catalogue number
  11. MK-1561575 — S1 , PDF p. 29 — MKP-G2; discharge; Mud King supplier catalogue number
  12. MK-1561571 — S1 , PDF p. 29 — MKP-G2; suction; Mud King supplier catalogue number
  13. MK-1561572 — S1 , PDF p. 29 — MKP-G2; discharge; Mud King supplier catalogue number
  14. MK-1712211 — S1 , PDF p. 29 — MKP-G2; suction; Mud King supplier catalogue number
  15. MK-1712206 — S1 , PDF p. 29 — MKP-G2; discharge; Mud King supplier catalogue number
  16. MK-1561577 — S1 , PDF p. 29 — MKP-G2; suction; Mud King supplier catalogue number
  17. MK-1561577 — S1 , PDF p. 29 — MKP-G2; discharge; Mud King supplier catalogue number
  18. MK-I30HA10 — S1 , PDF p. 29 — Piston family Imperial Piston; size 3''; Mud King supplier catalogue number
  19. MK-I30HA — S1 , PDF p. 29 — Piston family Imperial Rubber Kits; size 3''; Mud King supplier catalogue number
  20. MK-I34HK10 — S1 , PDF p. 29 — Piston family Imperial Piston; size 3½''; Mud King supplier catalogue number
  21. MK-I34HK — S1 , PDF p. 29 — Piston family Imperial Rubber Kits; size 3½''; Mud King supplier catalogue number
  22. MK-RT-400-10 — S1 , PDF p. 29 — Piston family Red Thunder Bonded Pistons; size 4''; Mud King supplier catalogue number
  23. MK-I40HK10 — S1 , PDF p. 29 — Piston family Imperial Piston; size 4''; Mud King supplier catalogue number
  24. MK-RB-400-10 — S1 , PDF p. 29 — Piston family Rubber Bonded; size 4''; Mud King supplier catalogue number
  25. MK-LL-400-10 — S1 , PDF p. 29 — Piston family Long Life (Urethane); size 4''; Mud King supplier catalogue number
  26. MK-RT-440-10 — S1 , PDF p. 29 — Piston family Red Thunder Bonded Pistons; size 4½''; Mud King supplier catalogue number
  27. MK-I44HK10 — S1 , PDF p. 29 — Piston family Imperial Piston; size 4½''; Mud King supplier catalogue number
  28. MK-I44HK — S1 , PDF p. 29 — Piston family Imperial Rubber Kits; size 4½''; Mud King supplier catalogue number
  29. MK-RB-440-10 — S1 , PDF p. 29 — Piston family Rubber Bonded; size 4½''; Mud King supplier catalogue number
  30. MK-LL-440-10 — S1 , PDF p. 29 — Piston family Long Life (Urethane); size 4½''; Mud King supplier catalogue number
  31. MK-0238 — S1 , PDF p. 29 — Rod arrangement ONE PIECE; Mud King supplier catalogue number
  32. MK-16-0238 — S1 , PDF p. 29 — Rod arrangement ONE PIECE; Mud King supplier catalogue number
  33. MK-24-0238 — S1 , PDF p. 29 — Rod arrangement ONE PIECE; Mud King supplier catalogue number
  34. MK-7403224 — S1 , PDF p. 29 — Rod arrangement ONE PIECE; Mud King supplier catalogue number

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