CAT 078-6635 FLANGE

CAT 078-6635 is a Caterpillar genuine drive end bearing belt (also called a drive end bearing retaining belt), compatible with the hydraulic pump drive end/engine flywheel bearings of 306E/307E excavators and 226B3/246B3 skid steer loaders. It is used to fix the bearing in circumferential positioning 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®…

Core Parameters and Information

Item Details
Part Model: CAT 078-6635 (0786635) Drive End Seat Ring Tie
Structure Type: Open-type elastic belt, including steel belt body, locking buckle, anti-slip teeth, equipped with 078-5253/078-5254 locking collar

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

Key Dimensions: Inner diameter 65 mm, width 12 mm, belt thickness 1.5 mm, opening gap 3 mm, compatible shaft diameter 65 ±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… 078-5253/078-5254 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: Hydraulic pump drive system and flywheel end seat ring fixing for 306E/307E mini excavators, 226B3/236B3/246B3 skid steer loaders, and 3044C/3054C engines.

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

For use with: Compatible with 078-5253/078-5254 locking collars and 078-6636 seat rings. Used for positioning and fixing the drive end seat ring, preventing vibration, abnormal noise, and component damage caused by seat ring loosening.

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, wrap it around the shaft diameter, and use a special tool to fully tighten the clip, ensuring the anti-slip teeth are engaged. The tightening torque is 8-10 N·m.

Post-installation inspection: Axial pulling of the seat ring should not cause movement, and circumferential rotation should not cause slippage. Run the equipment for 30 minutes; there should be no abnormal vibration or noise. After stopping the machine, re-test the strap; it should not be loose.

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. Disassemble and check the wear of the anti-slip teeth every 1000 hours. Replace it when the wear exceeds 0.3 mm to prevent the seat ring from becoming loose.