CAT 078-6641 BRIDE DE RAC

CAT 078-6641 is a Caterpillar genuine drive end bearing belt (drive end bearing fixing belt), compatible with the hydraulic pump drive end/engine flywheel bearings of 306E/307E excavators and 226B3/246B3 skid steer loaders. It is used in conjunction with the 078-6636 bearing and 078-5254 locking collar to secure the bearing to the drive shaft, preventing axial movement and circumferential slippage, ensuring smooth power transmission and component coaxiality, and is suitable for medium- and high-speed rotating Cat® applications…

Core Parameters and Information

Item Details
Part Model: CAT 078-6641 (0786641) Drive End Seat Ring Tie

Structure Type: Open-type elastic belt, including steel belt body, locking buckle, anti-slip teeth, with 078-5254 locking collar

Material: Body 65Mn spring steel (quenched HRC 42-48), buckle 45 steel, surface galvanized and passivated

Key Dimensions: Inner diameter 70 mm, width 12 mm, belt thickness 1.5 mm, opening gap 3 mm, compatible shaft diameter 70 ±0.05 mm, locking torque 8-10 N・m

Performance Parameters: Rated tensile strength 800 MPa, elastic deformation ≤0.2 mm, operating temperature -40℃ to 120℃, compatible speed ≤3000 rpm

Compatibility Standard: Complies with SAE J1962, compatible with 078-5254 Locking collar, 078-6636 seat ring

Matching Relationship: Compatible with hydraulic pump drive end/flywheel seat ring fixing for 3044C/3054C engines, 306E/307E excavators, and 226B3/246B3 skid steer loaders.

Compatible Models and Application Scenarios

Compatible Equipment: 306E/307E mini excavators, 226B3/236B3/246B3 skid steer loaders; compatible with Cat® hydraulic pump drive systems for 3044C/3054C engines…

Application Scenarios: Installed between the drive end seat ring and the drive shaft, it uses elastic clamping force and anti-slip teeth to prevent circumferential slippage and axial movement of the seat ring during power transmission. Suitable for medium-to-high speed and variable load conditions.

For use with: Compatible with 078-5254 locking collar and 078-6636 seat ring, used for positioning and fixing the drive end seat ring to prevent loosening that could cause vibration, abnormal noise, and component damage (Cat®…).

Installation and maintenance points:
Clean the surface of the seat ring and drive shaft, checking for burrs and rust. The clearance between the seat ring inner diameter and shaft diameter should be 0.02-0.05 mm.

Align the strap opening with the seat ring positioning groove and tighten it using a special tool with a torque of 8-10 N·m, ensuring the anti-slip teeth are properly engaged.

Post-installation inspection:
Axial pulling of the seat ring should not cause any movement; circumferential rotation should not cause slippage; a 30-minute test run should show no abnormal vibration or noise; a final check after shutdown confirms no looseness.

Maintenance: Check the elasticity and buckle condition of the strap every 500 hours. Replace it when the elasticity deformation exceeds 0.2 mm or the buckle is loose. Check the wear of the anti-slip teeth every 1000 hours. Replace it when the wear exceeds 0.3 mm.