CAT 008-7843 BUSHING

CAT 008-7843 is a Caterpillar genuine straight-tube self-lubricating bushing (pure original factory information, no additional description):

Core Parameters and Information

Item Details
Part Model: CAT 008-7843 (0087843) Bushing (Straight-tube self-lubricating bushing)

Part Type: Radial self-lubricating straight-tube bushing, compatible with pins and hinge holes, used to buffer vibration, reduce friction, and compensate for installation coaxiality errors

Material: Outer ring (GCr15 bearing steel, hardened HRC58-62), inner hole composite PTFE fabric gasket (thickness 0.8mm)

Key Dimensions: Inner diameter 40 mm, outer diameter 55 mm, total length 42 mm, gasket fit accuracy ±0.02 mm, chamfer 1×45°

Structural Features: One-piece seamless straight tube, inner hole PTFE gasket self-lubricating, suitable for unidirectional sliding and small-amplitude oscillation, oil-free maintenance, compatible with ±8° oscillation angle

Surface Treatment Outer ring blackened + passivated for rust prevention; gasket without additional treatment; deburred ends.

Matching method: Interference fit with mounting hole (H7/s6, interference 0.02-0.04 mm); Clearance fit with pin (D10/h9, clearance 0.05-0.09 mm).

Rated load: Radial rated dynamic load 32 kN, radial rated static load 70 kN, allowable sliding speed 0.1 m/s.

Operating temperature: -40℃ ～ +180℃

Weight: 0.26 kg

Compatible models and assemblies:

Mini excavators: CAT 301.7CR, 302.7CR (boom and stick connecting pins, bucket cylinder lower hinge point)

Skirmish loaders: CAT 242D, 272D (working device connecting rod pin bushing)

Matching parts: 008-7843 Bushings, Pins, Cotter Pins, Dust Rings

Installation and Maintenance Points
Clean the mounting holes and the outer diameter of the bushing, removing oil and burrs. The roughness of the mounting holes Ra≤1.6μm, and the outer diameter of the bushing Ra≤0.8μm.

Use a cold-pressing tool to press the bushing into the mounting hole. Do not strike directly. Ensure the bushing end face is flush with the mounting surface, without any misalignment.

Post-installation inspection: Ensure there is no jamming with the pin, the radial clearance meets the standard, and the bushing is free from deformation and cracks.

Maintenance: Check for wear every 1500 working hours. Replace the bushing if the wear exceeds 0.3mm or peeling occurs.