CAT 078-6636 FLANGE

CAT 078-6636 is a Caterpillar original drive end bearing (drive shaft positioning bearing), compatible with the hydraulic pump drive end of the 3044C/3054C engine in models such as the 306E/307E excavators and 226B3/246B3 skid steer loaders. It is used in conjunction with the 078-6635 drive end bearing belt and the 078-5254 locking collar to position the drive shaft and hydraulic pump input shaft, ensuring coaxiality of power transmission and preventing axial movement and circumferential slippage. It is suitable for medium- and high-speed rotating Cat® applications…

Core Parameters and Information

Item Details
Part Model: CAT 078-6636 (0786636) Drive End Seat Ring

Structure Type: Cylindrical positioning seat ring, with keyway in the inner hole and anti-slip groove on the outer circle, suitable for lacing and collar installation

Material: 42CrMo alloy steel (quenched and tempered HRC 28-32), surface anodized blackened, rust-proof and wear-resistant

Key Dimensions: Outer diameter 75 mm, inner diameter 65 mm, height 30 mm, keyway width 8 mm, depth 4 mm, anti-slip groove width 12 mm, depth 1.5 mm

Performance Parameters: Rated load torque 500 N・m, coaxiality tolerance ≤0.02 mm, operating temperature -40℃ to 120℃, suitable speed ≤3000 rpm

Compatibility Standard: Complies with SAE J1962, compatible with 078-6635 lacing belt, 078-5254 locking collar

Matching Relationship Compatible with the hydraulic pump drive end of 3044C/3054C engines, equipped with 078-6635 tie belt and 078-5254 locking collar.

Compatible Models and Application Scenarios

Compatible Equipment: 306E/307E mini excavators, 226B3/236B3/246B3 skid steer loaders, etc., compatible with the 3044C/3054C engine hydraulic pump drive system Cat®…

Application Scenarios: Installed between the drive shaft and the hydraulic pump input shaft, torque is transmitted via a keyway. The outer anti-slip groove, combined with the 078-6635 tie belt, prevents circumferential slippage and axial movement of the seat ring, ensuring smooth power transmission. Suitable for medium-to-high speed and variable load conditions Cat®…

For use with: Compatible with 078-6635 drive end seat ring tie and 078-5254 locking collar, used for positioning and fixing the drive end, preventing vibration, abnormal noise, and component damage caused by loosening (Cat®…).

Installation and maintenance points: Clean the surfaces of the drive shaft, seat ring, and hydraulic pump input 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 seat ring keyway with the drive shaft keyway and press it into place, ensuring no axial clearance. Install the 078-6635 tie and 078-5254 locking collar, tightening torque 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 shutdown, re-test the seat ring and tie; they should not be loose.

Maintenance: Check the wear of the seat ring keyway and anti-slip groove every 500 hours. Replace when the wear exceeds 0.3 mm. Disassemble and check the coaxiality every 1000 hours. Replace when the coaxiality is out of tolerance to avoid abnormal power transmission.