Caterpillar Main Pump Repair Kit 184-3957

Caterpillar Main Pump Repair Kit 184-3957 is part of the 19PARTS KOM line and is a Caterpillar replacement hydraulic repair kit listing assembled from the matching Motros component parts in the source file. Motros products in this catalog are made in Korea and produced in an ISO-certified manufacturing environment.

Kit overview

Assembly part number 184-3957, alternate no-dash reference 1843957, is mapped to the main pump component group shown below.

Included component parts

• 5I-8401 — Piston Shoe (set)
• 5I-4311 — Barrel (each)
• 5I-4476 — Valve Plate LH (each)
• 5I-8404 — Retainer Plate (each)
• 5I-8402 — Piston Ring (each)
• 5I-4403 — Center Pin (each)
• 5I-8403 — Spring (each)
• 5I-4475 — Drive Shaft (each)
• 5I-4485 — Shaft (each)
• 5I-4486 — Valve Plate RH (each)
• 5I-4408 — Head Cover (each)

Machine applications from source data

CAT 330, 330B, 330BL, 330LN, 330BLN, 330L, 345B, 345BL, 345BLC

Fitment verification

Because pump, swing motor, and travel motor groups can vary by model and serial number, always verify the assembly number, component list, and machine application before ordering. This kit page is intended to help customers buy the complete component group when the assembly number is the preferred search or ordering reference.

19PARTS KOM standard

This listing is organized under the 19PARTS KOM line, our Keep Ops Moving™ product standard for clear part-number identification, practical availability, and dependable aftermarket sourcing. For these Caterpillar hydraulic listings, Motros remains the vendor/manufacturer reference, with parts made in Korea and sourced from an ISO-certified manufacturing environment.

Quality note

19PARTS lists this Motros kit to support dependable hydraulic repairs, clean cross-reference research, and practical sourcing for customers who need to Keep Ops Moving™.