CAT 068-9782 BUSHING

CAT 068-9782 is a Caterpillar genuine fuel pump tappet bushing (pure original factory information, no additional description). It is compatible with the high-pressure common rail fuel pump tappet assembly of C13/C15/C18 engines. It is used for clearance compensation between the tappet shaft and the pump body bore, wear reduction and resistance, vibration and shock suppression, ensuring the accuracy of tappet reciprocating motion and stable fuel injection timing. It works in conjunction with the 068-8527 adjusting ring and the 068-8555 retaining ring.

Core Parameters and Information

Item Details
Part Model: CAT 068-9782 (0689782) Tappet Shaft Bushing

Structure Type: Thin-walled cylindrical sliding bushing, oil groove-free design, mirror-finished inner bore, tin bronze plating + graphite solid lubricant layer

Material: QSn6.5-0.1 tin bronze (base HB80-100, surface plating 0.02 mm tin bronze + 0.01 mm graphite layer), Weight: 0.015 kg

Key Dimensions: Inner diameter 22 mm, outer diameter 25 mm, length 18 mm, wall thickness 1.5 mm, inner bore roughness Ra≤0.2 μm, outer diameter tolerance ±0.01 mm

Performance Parameters: Radial clearance 0.01-0.02 mm, operating temperature -40℃ to 190℃, sliding friction coefficient ≤0.08, wear life ≥5×10⁵ cycles

Compatibility Standard: Complies with CAT 4W-7023 Bushing Technical Specifications: Inner bore roundness ≤ 0.005 mm, straightness ≤ 0.003 mm
Compatible Models and Assemblies
Compatible Parts: 068-6117 Bearing, 068-8527 Adjusting Ring, 068-8555 Elastic Retaining Ring, 068-2742 Tappet Retainer
Compatible Equipment: CAT 336D2/349D2 Excavator, 980K/982M Loader, D8T/D9T Bulldozer (C13/C15/C18 Engine), used for high-pressure common rail fuel pump tappet shaft support
Installation: One tappet shaft per unit, press-fitted into the pump body bushing hole, working with the adjusting ring and retaining ring to position the tappet shaft, ensuring axial/radial positioning accuracy.
Installation and Maintenance Points: Clean the bushing and pump body hole, check for bushing deformation and plating peeling, and check the pump body hole diameter. 25⁰⁺⁰・⁰15 mm, depth 18 mm, surface roughness Ra≤0.8 μm.

Cold press installation using a special press (075-2354), pressing force 8-10 kN. After press-fitting, the bushing end face should be flush with the pump body bore, without skewing, and the inner bore should not have elliptical deformation.

After installation, check the tappet shaft rotation resistance to be 0.5-1.0 N・m, the bushing-shaft clearance to be 0.01-0.02 mm, and the fuel pump should operate without abnormal noise or leakage.

Maintenance: Check bushing wear every 2000 hours (replace when inner bore wear ≥0.03 mm). During replacement, simultaneously check pump body bore wear; if necessary, ream the bore and replace with a larger bushing.