CAT 078-6296 BRAS DE VALV

CAT 078-6296
Official Name: BRAS DE VALV (French) → Valve Arm / Valve Lever
Type: A transmission rocker arm in a hydraulic/fuel control mechanism, used to transmit external operating force to the valve spool to achieve valve position switching.

Core Specifications (CAT Original Standard)

Part Number: 078-6296

Material: 42CrMo / 4140 alloy steel, tempered + surface hardened

Surface: Blackened / phosphated, wear-resistant and rust-proof

Structure: Single-arm rocker arm with shaft hole, drive boss/roller, mounting positioning surface

Function: Amplifies/transmits operating force through leverage, drives the spool valve and check valve core, controls oil circuit opening and closing and pressure regulation

Compatible Systems and Typical Applications

Compatible with: 3044C / 3054C engine fuel injection control, hydraulic pilot valve assembly

Models: 306E / 307E excavators, 226B3 / 246B3 skid steer loaders

Location: External drive mechanism for hydraulic pilot valve, pressure regulating valve, relief valve, and 078-0776 spool valve, 078-0653 check seat, 078-0921 Adjusting screw and linkage

Installation and maintenance points

Clean the shaft hole and contact surface before installation to ensure there are no burrs or impurities.

Match with the pin/bushing (e.g., 078-0604/078-0625), controlling the clearance to 0.01–0.03 mm.

Align the drive end with the valve core/push rod, ensuring no off-center loading or jamming.

Inspect for wear, deformation, and cracks every 2000 hours. If jamming, sluggish operation, or unstable pressure occurs, prioritize checking this rocker arm.