CAT 078-7330 ENSEMBLE DE

CAT 078-7330 (0787330) is a Caterpillar original equipment manufacturer (OEM) “Drive End Seat Ring Mounting Kit” (French: ENSEMBLE DE, English: Assembly Kit), compatible with the hydraulic pump drive end/flywheel seat ring mounts of 306E2/307E2 excavators and 226B3/236B3 skid steer loaders. It includes the 078-6648 drive end seat ring tether, 078-6636 drive end seat ring, 078-5254 locking collar, mounting pins, and anti-slip washers. These components are used for seat ring positioning, tightening, and preventing loosening, ensuring smooth power transmission.

Core Parameters and Information

Item Details
Part Model: CAT 078-7330 (0787330) Drive End Seat Ring Mounting Assembly (ENSEMBLE DE)

Assembly Composition: 078-6648 Drive End Seat Ring Lace ×1, 078-6636 Drive End Seat Ring ×1, 078-5254 Locking Collar ×1, Locating Pin ×2, Anti-slip Washer ×1

Compatible Models: 306E2/307E2 Excavators, 226B3/236B3/246B3 Skid Steer Loaders, Compatible with 3044C/3054C Engine Hydraulic Pump Drive End/Flywheel Seat Ring

Material: Lace ring 65Mn spring steel (quenched HRC 42-48), seat ring 40Cr, collar 45# steel, galvanized and passivated surface

Key Dimensions: Seat ring inner diameter 75 mm, lace ring inner diameter 75 mm 14 mm width, 1.8 mm thickness, 75 mm inner diameter collar, 8 mm diameter locating pin, 25 mm length.
Compatibility Standard: Complies with SAE J1962, suitable for 3044C/3054C engine hydraulic pump drive systems.
Performance Parameters: Rated tensile strength 850 MPa, operating temperature -40℃ to 120℃, suitable speed ≤3200 rpm.
Compatibility and Applications:
Compatible Equipment: 306E2/307E2 excavators, 226B3/236B3/246B3 skid steer loaders, suitable for mounting the hydraulic pump drive end/flywheel seat ring of 3044C/3054C engine.
Application Scenarios: Used for positioning, tightening, and preventing loosening of the hydraulic pump drive end/flywheel seat ring, preventing axial movement and circumferential slippage of the seat ring, suitable for medium and high speed rotation and variable load conditions, ensuring smooth power transmission.

Matching Relationship: All parts within the assembly are designed for use together. After installation, they effectively secure the seat ring, preventing loosening that could lead to vibration, abnormal noise, and component damage.

Installation and Maintenance Points: Clean the drive shaft and seat ring surfaces, checking for burrs and rust. The clearance between the seat ring’s inner diameter and the shaft diameter should be 0.02-0.05 mm.

Install the locating pin, anti-slip washer, 078-6636 seat ring, and 078-5254 collar in sequence. Align the 078-6648 strap opening with the seat ring’s locating groove and tighten it using a special tool with a torque of 10-12 N·m, ensuring the anti-slip teeth are properly engaged.

Post-Installation Inspection: Axial pulling of the seat ring should not cause any movement, and circumferential rotation should not cause slippage. A 30-minute test run should show no abnormal vibration or noise. After stopping the machine, a retest should confirm no loosening.

Maintenance: Check the condition of each component every 500 hours. Replace the component if the elastic deformation of the strap exceeds 0.2 mm, the collar is loose, or the seat wear exceeds 0.3 mm.