National JWS-340 Mud Pump Parts: Model-Specific Gasket and Valve-Position Matching

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.