CAT 373-1777 BUSHING

CAT 373-1777 (3731777) is a Caterpillar original straight-sleeve steel bushing, suitable for articulated parts of engineering machinery/sliding supports for chassis pins. The following is purely precise information (no additional description):

Core Parameters and Information

Item Details
Part Model: CAT 373-1777 Straight Sleeve Bushing

Part Type: Flangeless standard straight-sleeve bushing, suitable for pin/shaft hole clearance fit, withstands radial loads, used for articulated points/moving parts of the chassis

Material: Low-carbon alloy steel, integrally quenched and tempered, hardness HRC 52-58, surface anodized black + oil impregnation for rust prevention, inner hole precision ground, roughness Ra≤0.8μm

Key Dimensions: Inner diameter 50.80 mm (2.0000 in), outer diameter 63.50 mm (2.5000 in), length 50.80 mm (2.0000 in), wall thickness… 6.35 mm, 1×45° chamfer at both ends

Structural Features: No oil grooves/oil holes (suitable for pre-lubrication/periodic grease injection), uniform cylinder wall thickness, flush ends, no steps, suitable for static/swinging conditions

Compatible Structures: Loader boom cylinder upper hinge point bushing, excavator stick cylinder lower hinge point bushing, bulldozer balance beam pin bushing, grader blade pivot bushing

Applicable Working Conditions: Suitable for -40℃ to 120℃, swing angle ≤±30°, radial load ≤20 kN, suitable pin speed ≤50 rpm

Compatible Machines and Assemblies:

Loaders: CAT 950GC, 962M (boom/rocker arm pin bushing, steering tie rod bushing)
Excavators: CAT 320GC, 326GC (stick cylinder trunnion bushing, boom lower hinge point bushing)
Crawler Bulldozers: CAT D6K, D7E (Balance beam pin bushing, track frame pivot bushing)
Graders: CAT 140M, 160M (Shovel tilt cylinder bushing, towing frame pin bushing)
Compatible Assemblies: CAT 4W-5892 boom cylinder assembly, 3512 engine fan bracket pin assembly, 789B mining dump truck steering knuckle bushing assembly
Installation and Fitting Points
Shaft diameter (pin): 50.80 +0.02/-0.00 mm, bushing inner hole and pin clearance fit (clearance 0.03-0.05 mm) to ensure smooth swing.

Mounting hole diameter: 63.50 +0.03/-0.00 mm, bushing outer diameter and mounting hole interference fit (interference 0.015-0.030 mm) to prevent bushing rotation.

Install using the cold pressing method. Apply pressure to the bushing end face using a special press tool. Do not hammer, as this may deform the bushing or damage the mounting hole.

Before installation, clean the pin, mounting hole, and bushing, ensuring they are free of burrs, oil, and rust. Inspect the bushing for cracks, deformation, and surface damage.

After installation, the bushing end face should be flush with the mounting hole end face. There should be no interference between adjacent components, and no jamming during movement. Lubricate periodically (every 500 working hours).