CAT 078-7406 RETAINER BRA

CAT 078-7406 is a Caterpillar genuine brake seat ring (brake hub mounting seat ring / brake drum locating ring), compatible with the 306E2/307E2 excavators, 226B3/236B3 skid steer loaders, and the 3044C/3054C engine power take-off brakes. It is used to position the brake drum and hub, ensuring uniform brake clearance, improving braking stability, and is suitable for medium- and low-speed heavy-duty braking conditions in Cat®…

Core Parameters and Information

Item Details
Part Model: CAT 078-7406 (0787406) Brake Seat Ring

Structure Type: Circular locating seat ring with locating groove and bolt holes, suitable for wheel hub mounting surfaces

Material: 40Cr alloy structural steel, surface hardened + anodized black, hardness HRC 45-50, wear-resistant and fatigue-resistant

Key Dimensions: Inner diameter 120 mm, outer diameter 150 mm, thickness 10 mm, locating groove width 5 mm, bolt hole diameter 10 mm (4 evenly distributed)

Performance Parameters: Rated operating temperature -30℃ to 150℃, radial runout ≤0.05 mm, end face flatness ≤0.03 mm

Compatibility Standard: Complies with SAE J188 standard, suitable for 3044C/3054C engine power output brakes

Matching Relationships Used with brake drums, wheel bolts, and brake pads for brake system positioning and installation.

Compatible Models and Application Scenarios

Compatible Equipment: 306E2/307E2 mini excavators, 226B3/236B3/246B3 skid steer loaders, compatible with the power output brakes of 3044C/3054C engines.

Application Scenarios: Installed between the wheel hub and brake drum, the positioning groove and bolt holes achieve precise positioning of the brake drum, ensuring uniform clearance between the brake drum and brake pads, preventing uneven brake wear and abnormal noise; simultaneously transmitting braking torque to ensure stable operation of the braking system.

Compatible Use: Used with brake drums, wheel bolts, brake pads, and brake calipers for brake system positioning and installation, improving braking reliability.

Installation and Maintenance Points: Clean the wheel hub mounting surface and seat surface, checking for burrs and rust; ensure the seat seat positioning groove matches the wheel hub positioning pin.

Install the brake seat ring onto the hub mounting surface, aligning it with the locating pins and bolt holes. Tighten the bolts diagonally using a torque wrench to a torque of 25-30 N·m.

Post-installation inspection: After installation, the radial runout of the brake drum should be ≤0.1 mm, the brake clearance 0.2-0.5 mm, and a test run should show no uneven wear or abnormal noise.

Maintenance: Inspect the brake seat ring for wear and deformation every 500 hours. Replace it if wear exceeds 0.2 mm or deformation exceeds 0.1 mm. Inspect the brake seat ring each time the brake drum is disassembled to ensure positioning accuracy.