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Cat® 115-3699 Front Idler Bearing Assembly (85.125mm ID) for 330, 336, and 345 Series Excavators

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  2. Cat® 115-3699 Front Idler Bearing Assembly (85.125mm ID) for 330, 336, and 345 Series Excavators
Cat® 115-3699 Front Idler Bearing Assembly (85.125mm ID) for 330, 336, and 345 Series Excavators
Cat® 115-3699 Front Idler Bearing Assembly (85.125mm ID) for 330, 336, and 345 Series Excavators

Ensure undercarriage stability with the Cat® 115-3699 Front Idler Bearing. Featuring an 85.125mm ID and high-strength ductile iron construction, this bearing is engineered for Cat 336, 340, and 345 excavators and MD6250 drills. Designed to reduce friction and transfer heavy loads in professional B2B mining and construction applications. Global export available.

Technical Specifications 115-3699 - Ductile Iron Front Idler Bearing for CAT

115‑3699 Front Idler Bearing Housing — High‑Strength Ductile‑Iron Idler Support Bracket

The Cat® 115‑3699 Front Idler Bearing Housing is a precision‑machined heavy‑duty structural component for CAT undercarriage systems. Constructed from high‑toughness spheroidal graphite ductile iron, it serves as the core pivot support for the front idler assembly, bearing huge machine loads and ensuring stable track‑chain rotation and tension control. Optimized for mining, logging and heavy‑construction scenarios, it delivers excellent shock resistance and fatigue durability under long‑hour high‑load working conditions.

1. Technical Specifications

Technical ParameterImperial SizeMetric Size
Part Number115‑3699115‑3699
Core MaterialHigh‑Performance Spheroidal Graphite Ductile Iron
Shaft Mounting Bore3.351 in85.125 mm
Bearing Mount Length14.567 in370.0 mm
Overall Outer Dimensions18.504 × 7.087 × 4.39 in470.0 × 180.0 × 111.5 mm
Dowel Hole Diameter0.63 in16.0 mm

2. Machine Compatibility

This OEM‑precision idler bearing housing is widely matched for CAT heavy‑duty excavators, drilling rigs and forestry machinery:

  • Excavators: 330/330D L, 335, 336D/E/F/GC, 340F, 345/D/GC, 350 Series

  • Mining Drilling Rigs: MD6200, MD6240, MD6250, MD6290 Surface Drill Rigs

  • Forestry Machinery: 548 Log Loaders, 521B‑552 Harvesters, TK732‑TK1051 Feller Bunchers

  • Hydraulic Power Units: 330D, 336D/E/F, 345D, 352F Series Mobile Hydraulic Power Stations

3. Key Features & Advantages

  • Ultra‑High Load‑Bearing Capacity: Large‑area contact structure evenly disperses radial loads, avoiding local stress concentration and fatigue damage of the idler shaft.

  • Excellent Impact‑Resistant Ductile Iron: Spheroidal graphite material resists heavy‑impact shocks, suitable for extreme mining and logging working environments.

  • Low‑Friction Track‑Motion Design: Precision‑machined inner bore reduces rotational friction loss, lowering track‑link wear and improving undercarriage service life.

  • Strict OEM‑Tolerance Machining: Exact dimensional accuracy ensures perfect coaxiality, preventing track deviation and derailment failures.

Commercial Reference Information
Product: Front Idler Bearing Housing / Bracket
Cross Part Number: 1153699
MOQ: 1 Unit
Warranty Period: 6 Months
Note: Shaft‑interface grease lubrication required during installation

For bulk wholesale, technical consultation and undercarriage structural component solutions:

Xuzhou Sinoswift Import & Export Co., Ltd.
Contact: +86 13701956981
Email: [email protected]

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