Swing Motor Seal Kit 173-3454 for CAT 320C 320D Excavators | Slewing Device Repair Set 1733454

Restore Precise Upperstructure Control & Stop Swing Motor Leaks

Excavator swing motors endure continuous torsional shock loads and aggressive pressure shifts during digging, swinging, and slope operations. Worn internal seals cause hydraulic oil bypass, reduced slewing torque, brake slippage, and uncommanded house drift when holding heavy loads on inclines.

This heavy-duty 173-3454 swing motor seal kit restores precise rotational holding force and dynamic fluid isolation for Caterpillar 320C and 320D hydraulic excavators. Precision-molded to match exact OEM dimensional profiles, every seal in this pack delivers a leak-free drop-in rebuild to restore full machine efficiency.

High-Torque Dynamic Seal Engineering

• High-Temperature Rotary Shaft Seals: Molded from premium FKM (Viton) and specialized elastomers to withstand lip friction, high rotational speeds, and thermal exposure exceeding 120°C without lip hardening or cracking.

• Low-Friction PTFE Glyd & Step Rings: High-grade bronze-filled PTFE backing elements eliminate stick-slip friction, delivering smooth 360-degree upperstructure swing control under extreme hydraulic pressure.

• Static Housing & Swing Brake O-Rings: High-durometer Nitrile Rubber (NBR 70°/80° Durometer) maintains fluid separation between swing brake oil circuits and the planetary gearbox casing, preventing fluid cross-contamination.

• Severe-Duty Dust Scraper: Secondary wiper lips repel abrasive quartz dust, silica sand, and moisture from penetrating the slewing motor casing and damaging internal rotating groups.

Target Equipment & Component Compatibility

• Machine Models: CAT 320C, CAT 320C L, CAT 320D, CAT 320D L Excavators

• Target Component: Hydraulic Swing Motor / Slewing Device Group

• Part Number Cross-Reference: 173-3454 / 1733454 / 173 3454

Technical Specifications

• Kit Type: Hydraulic Swing Motor Overhaul / Repair Seal Pack

• Primary Materials: High-Spec Fluorocarbon (FKM / Viton), Polyurethane (PU), Bronze-Filled PTFE, Industrial NBR Rubber

• Fluid Compatibility: Mineral-based hydraulic oils, synthetic hydraulic fluids, ISO VG 32/46/68

• Application Target: Direct-fit replacement for field servicing or full shop motor overhauls

Fitment Verification Notice

Caterpillar 320C and 320D excavators may use different swing motor manufacturer groups across various serial prefixes and assembly years. Before placing your order, check your stamped motor assembly tag or cross-reference 173-3454 / 1733454 in your CAT parts manual to ensure proper dimensional compatibility.