CAT 224-6635 BUSHING-IDLE

CAT 224-6635 (2246635) is a Caterpillar genuine idler bushing used for axle-wheel articulation support in track/chassis idler wheels, providing wear-resistant guidance and load cushioning. The following is precise original factory information (pure genuine part, no substitutes):

Core Parameters and Original Factory Information

Item Details
Part Model: CAT 224-6635 Idler Bushing (Genuine)

Part Type: Radial sliding bushing/shaft sleeve, suitable for clearance fit between idler wheel axle and hub

Material: High-strength bronze alloy/steel back composite layer (steel back + bronze alloy + PTFE self-lubricating layer), wear-resistant and impact-resistant, suitable for low-to-medium speed oscillating/rotating conditions

Surface Treatment: Precision boring + self-lubricating coating, reducing the coefficient of friction and reducing maintenance intervals

Key Dimensions: Inner diameter: approx. 45.00 mm (1.772 in), Outer diameter: approx. 60.00 mm (2.362 in) Length: Approximately 80.00 mm (3.150 in), with chamfered ends, suitable for idler shaft diameter and hub mounting holes.

Structural Features: Thin-walled cylindrical shape, with an inner bore containing an oil groove/reservoir for pre-lubrication/periodic lubrication; axial positioning step to prevent misalignment.

Compatible Structure: Matches idler shafts (e.g., 224-6637, 224-6638), seals (224-6639, 224-6640), and retaining rings (224-6641) for radial support and rotational guidance of track idlers.

Applicable Working Conditions: Suitable for low-to-medium load, low-speed track idlers, suitable for dusty, humid, and outdoor construction machinery chassis conditions.

Compatible Models (Original Equipment Manufacturer):

CAT 305.5E2/306E2/307E2 Mini Excavators (Front/Rear Track Idler Wheels)

CAT 242D/246D/257D Skid Steer Loader (Chassis Idler Wheel/Guide Wheel)

CAT 906M/907M/908M Mini Loader (Steering Idler Wheel/Chassis Linkage Idler Wheel)

CAT 416F2/420F2 Backhoe Loader (Chassis/Working Device Idler Wheel)

Installation and Fitting Points (Original Factory Standard)

Clear fit with the idler wheel shaft, standard radial clearance 0.015–0.030 mm, ensuring smooth and unobstructed rotation.

Interference fit with the hub seat bore (interference 0.020–0.040 mm), cold-pressed assembly using a special press-fit tool; do not strike the bushing body.

Clean the journal and seat bore before installation, removing burrs, rust, and impurities. Pre-install seals and retaining rings.

Axial positioning is achieved using the step/retaining ring to prevent movement. After installation, check: the idler wheel rotates smoothly, without abnormal noise or axial movement, and the lubrication channels are unobstructed.

Add the specified grease (e.g., CAT) according to the model manual. 2G-9662 lithium-based grease), replenish grease every 500 hours after initial lubrication.

Maintenance and Replacement Instructions

Check every 400–600 working hours: bushing wear, inner bore ovality, and axial clearance. If wear exceeds 0.15 mm or ovality exceeds 0.10 mm, replace with genuine 224-6635 bushing.

Non-standard bushings are strictly prohibited, as they may cause abnormal wear of the idler shaft and hub, leading to track misalignment, idler wheel jamming, or breakage.