Doosan 14515047 Hydraulic Foot Pedal Control Valve DH225-7 DH225-9 Foot Operated Hydraulic Valve

Doosan 14515047 Excavator Foot Pedal Valve Travel Control Foot Operated Valve Hydraulic Pedal Assy Excavator Machinery Parts

Core Functions

• Travel Control (Dominant Function): Left and right pedals operate the left and right tracks respectively. Depressing pedals moves the machine forward or backward, with pressing stroke adjusting travel speed.
• Attachment Operational Control: Regulates switches and motions of breakers, quick couplers, hydraulic shears and other work attachments.
• Motion Supplementary Control: On selected excavator models, it fine‑tunes boom and arm positions or collaborates with joysticks to complete combined actions.
• Auto‑neutral Safety Feature: Returns to neutral position automatically upon release, cutting off pilot pressure to eliminate accidental startup risks.

Working Principle

• This pilot valve outputs only minor hydraulic pressure signals and does not directly drive travel motors.
• Non‑operation state: Automatic neutral reset with no pressure output, keeping the machine stationary.
• Operation state: Spool displacement delivers hydraulic signals to the main multi‑way valve to actuate travel motors.
• Release state: Spring reset halts all corresponding movements rapidly.

Common Faults

• Travel deviation problem: Internal leakage or spool seizure in one‑side pedal valve
• Stuck non‑return pedal: Damaged spring component or jammed spool
• Sluggish traveling performance: Low pilot pressure or worn valve assembly parts
• Hydraulic seepage failure: Aging seals or valve body structural damage

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