CAT 299-0811 Bushing

CAT 299-0811 is a Caterpillar genuine steel-backed copper alloy oilless self-lubricating bushing (DU type, bimetallic structure). It is used to guide and support the piston rod of the bucket tilt cylinder/boom lifting cylinder in Cat 299C skid steer loaders. Its core function is to absorb reciprocating motion impact and reduce friction, compensating for the clearance between the hydraulic cylinder piston rod and the cylinder guide sleeve. The following is the professional structured information:

Core Technical Parameters (Professional Version)

Item Details
Basic Attributes
Model 299-0811, Type: Steel-backed copper alloy self-lubricating bushing (DU type, bimetallic), Compatible with Cat 299C skid steer loader bucket tilt cylinder (cylinder number 2935711/2935712), boom lifting cylinder piston rod, Material: Low carbon steel back + bronze powder sintered layer + PTFE mixed coating, Inner diameter φ35 mm (compatible with φ35 mm piston rod), Outer diameter φ45 mm, Total length 40 mm mm, single weight approximately 0.18 kg, rated load capacity 200 MPa, friction coefficient ≤0.05 (oil-free condition), operating temperature -40℃ to +120℃, compatible piston rod tolerance f7, compatible cylinder guide sleeve tolerance H8, suitable for medium-load hydraulic cylinders with reciprocating speed ≤1 m/s

Key Dimensions: Inner diameter tolerance 0/-0.012 mm, outer diameter tolerance +0.015/-0.010 mm, length tolerance ±0.1 mm, steel backing thickness 2.0 mm, bronze layer thickness 1.5 mm, PTFE coating thickness 0.05 mm, chamfer at both ends 0.5×45°, coaxiality ≤0.03 mm, compatible piston rod radial clearance 0.020-0.030 mm

Material and Manufacturing Process: Low carbon steel backing (SPCC, thickness 2.0 mm) (mm, good weldability), bronze powder sintered layer (CuSn10Pb10, hardness HB 80-100), surface PTFE+Pb mixed coating (containing MoS₂, wear resistance coefficient 0.15), coating is rolled and cured, bonding strength ≥20 MPa, fatigue life ≥10^6 cycles, oil-resistant/aging-resistant, suitable for hydraulic oil (mineral oil/synthetic oil) media

Compatible machine model: Cat 299C skid steer loader (serial number JSP997-1000, JSP1055-UP), suitable for bucket tilt cylinder (cylinder number 2935711/2935712), boom lifting cylinder piston rod, used for guidance support and anti-wear, suitable for φ35 mm piston rod, installed in the inner hole of cylinder guide sleeve, and mates with dust ring/sealing ring

Assembly fit: Interference fit with guide sleeve (interference 0.010-0.015) The guide sleeve should have a clearance fit with the piston rod (clearance 0.020-0.030 mm), with a rear end face runout ≤0.05 mm, smooth reciprocating motion, and radial runout ≤0.1 mm. It should be compatible with cylinder guide sleeves with an inner diameter ≥45 mm and a depth ≥40 mm. Installation and Maintenance Points: Before installation, clean the guide sleeve inner hole and check for deformation/coating peeling. Use the cold-fit method (pressing the guide sleeve into the tooling) to smoothly press the bushing in. Do not strike the bushing end face to prevent coating damage.

After installation, check that the piston rod reciprocates smoothly without abnormal resistance. Check every 800 hours. Replace the bushing immediately if the inner diameter wear is >0.1 mm or the coating peels off.

Maintenance Recommendations: Use Cat HYDO Advanced 10W hydraulic oil. Change the hydraulic oil every 1500 hours, ensuring oil cleanliness meets NAS 1638 Class 7 to reduce bushing wear.