CAT 069-5112 BUSHING

CAT 069-5112 is a Caterpillar genuine fuel pump tappet bushing (purely genuine and accurate information, no additional description). It is compatible with the high-pressure common rail fuel pump tappet assembly of C13/C15/C18 engines. It works in conjunction with the 068-9819/069-5059 retainer, 068-8555 retaining ring, and 068-8527 adjusting ring. It provides radial support, friction reduction, and positioning between the tappet shaft and the pump body bore, reducing friction during tappet reciprocating motion, ensuring stable fuel injection timing, and preventing uneven wear of the tappet shaft and pump body bore (Cat®…).

Core Parameters and Information

Item Details
Part Model: CAT 069-5112 (0695112) Tappet Bushing

Structure Type: Integral cylindrical bushing with an inner oil reservoir, chamfered ends, and anodized surface

Material: Tin bronze (CuSn8P), self-lubricating with oil, hardness HB90-110, density 8.8 g/cm³, weight 0.065 kg

Key Dimensions: Inner diameter 22 mm, outer diameter 28 mm, length 25 mm, inner oil reservoir width 2 mm, depth 0.5 mm, chamfered ends 1×45°

Performance Parameters: Operating temperature -40℃ to 180℃, coefficient of friction ≤0.15, radial clearance 0.01-0.02 mm, fatigue life ≥1.5×10⁶ cycles

Compatibility Standard: Complies with CAT 4W-7023 bushing technical specifications, inner and outer diameter tolerance ±0.01 mm, length tolerance ±0.1 mm
Compatible Models and Assemblies
Compatible Parts: 068-9819/069-5059 Fixing Device, 068-8555 Elastic Retaining Ring, 068-8527 Adjusting Ring, 068-6117 Bearing
Compatible Equipment: CAT 336D2L/349D2L Excavator, 980M/982M Loader, D8T/D9R Bulldozer (C13/C15/C18 Engine), used for radial support of the high-pressure common rail fuel pump tappet shaft and pump body bore
Matching Installation: 1 piece per tappet shaft, press-fitted into the tappet bore of the pump body, working with the fixing device to achieve radial positioning and anti-rotation of the tappet shaft, reducing frictional losses.
Installation and Maintenance Points: Clean the bushing and pump body tappet bore, check the bushing for deformation, cracks, and scoring, and ensure the mounting surface roughness Ra≤1.6. μm, flatness ≤0.01 mm.

Cold press fitting (pressing force 8-10 kN) is used to ensure the bushing end face is flush with the pump body bore end face, without skewing, and the clearance between the inner bore and the tappet shaft is 0.01-0.02 mm.

After installation, check that the radial runout of the tappet shaft is ≤0.01 mm, the bushing fits snugly against the pump body bore, and the fuel pump operates without abnormal noise or leakage.

Maintenance: Check bushing wear every 2000 hours (replace when inner diameter wear >0.05 mm). During replacement, simultaneously check the retainer and retaining ring to prevent component positioning failure.