Caterpillar Swing Motor Repair Kit 123-1998

Caterpillar Swing Motor Repair Kit 123-1998 is part of the 19PARTS KOM line, our Keep Ops Moving™ hydraulic parts program for customers who need clear part-number identification, practical availability, and dependable aftermarket sourcing. This swing motor repair kit is built around Korean-made hydraulic components sourced through our supplier network for Caterpillar equipment applications.

Kit overview

Assembly part number 123-1998, alternate no-dash reference 1231998, is mapped to the swing motor component group shown below.

Included component parts

• 5I-8632 — Piston Shoe (set)
• 5I-8631 — Barrel (each)
• 5I-8628 — Valve Plate (each)
• 5I-8636 — Retainer Plate (each)
• 5I-8637 — Thrust Plate (each)
• 5I-8640 — Shaft (each)
• 5I-8633 — Spacer (each)
• 5I-8634 — Ball Guide (each)
• 5I-8629 — Serparation Plate (each)
• 5I-8630 — Friction Plate (each)
• 5I-8828 — Seal Kit (each)

Machine applications from source data

CAT 320, 320BL, 320L, 320N, 345B, 345BL EXCAVATOR

KOM hydraulic standard

KOM stands for Keep Ops Moving™. For hydraulic repair parts, that means we focus on traceable sourcing, Korean-made component options where available, clean cross-reference support, and fitment verification before the part reaches the customer.

Fitment verification

Pump, swing motor, and travel motor groups can vary by model, serial number, and hydraulic arrangement. Always verify the assembly number, included components, machine model, serial range, and service-book information before ordering.

Quality note

This KOM listing is intended for buyers who want a more identifiable aftermarket hydraulic option than anonymous marketplace parts, while still confirming every replacement by part number and machine application.