E70B Excavator Foot Pedal Valve Komatsu Excavator Foot Operated Hydraulic Valve

Excavator Foot Valve E70B Hydraulic Pedal Control Valve Komatsu Excavator Parts Foot Operated Directional Valve

Core Functions

• Travel Control (Main Application): Left‑right pedals control left‑right tracks respectively. Depressing pedals moves the machine forward or backward, with pedal stroke setting travel speed.
• Attachment Control System: Activates and controls attachments such as hydraulic breakers, quick couplers and cutting shears.
• Auxiliary Motion Control: For certain excavator versions, it fine‑tunes boom and stick movements or combines with joysticks for simultaneous compound actions.
• Auto‑neutral Safety Design: Resets to neutral position automatically when released, cutting pilot pressure to prevent accidental movement.

Working Principle

• This pilot valve only outputs low‑pressure control signals instead of directly driving travel motors.
• Un‑stepped state: Neutral position retained automatically with no pressure output, keeping the machine stationary.
• Stepped state: Spool displacement transmits hydraulic signals to the main multi‑way valve to drive travel motors.
• Released state: Spring reset triggers immediate stop of related movements.

Common Faults

• Travel deflection: One‑side pedal valve internal leakage or spool sticking
• Non‑returning pedal: Spring fracture or spool blockage
• Slow and weak traveling: Insufficient pilot pressure or valve wear
• Oil leakage failure: Worn seals or valve body defects

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