Kobelco SK75-8 Travel Pedal Valve

3 month ago

8 0 

4 year

Product details

I. Function

• Travel Control: Operated via foot pedal, it regulates hydraulic oil supply to the travel motors, enabling forward/reverse movement, steering, and speed adjustment of the excavator.

• Hydraulic Signal Conversion: Converts mechanical foot pedal force into hydraulic signals to drive main valve spool displacement, precisely controlling oil flow and direction.

• Safety Protection: Some designs integrate overload protection or emergency braking functions to prevent equipment damage from unexpected loads during travel.

II. Structural Features

1. Valve Body Design

• Forged from high-strength alloy steel to withstand high-pressure conditions (typically ≥35 MPa), with precision-machined internal flow paths to minimize pressure loss.

• Sealing system uses fluororubber or PTFE materials, ensuring leak-free performance across temperatures ranging from -40°C to 120°C.

2. Foot Pedal Mechanism

• Lever-type pedal with spring return mechanism, offering light operation force (typically ≤50 N) and rapid reset.

• Adjustable pedal travel to accommodate different operator preferences; some models integrate displacement sensors for electro-hydraulic proportional control.

3. Integrated Modules

• High-end models incorporate pressure-compensated valves to maintain consistent travel speed despite load variations, enhancing operational stability.

• Optional pilot control interfaces enable linkage with electronic control systems for remote or automated operation.

III. Application Scenarios

• Foundation Construction: Controls excavator movement during road building or site leveling, coordinating with bucket operations for earthmoving tasks.

• Mining Operations: Adapts to rough terrain travel, such as climbing slopes or traversing obstacles, requiring high reliability under harsh conditions.

• Rescue & Demolition: Enables precise equipment positioning in confined or hazardous areas, demanding responsive and durable valve performance.

IV. Maintenance Guidelines

1. Regular Inspections

• Check sealing components every 500 operating hours for wear, replacing aged or damaged O-rings and dust seals.

• Clean valve body surfaces to prevent contaminants from entering the spool and causing jamming.

2. Hydraulic Oil Management

• Use anti-wear hydraulic oil meeting ISO VG46 or HM standards, with regular replacement (typically every 2,000 hours) and oil filtration.

• Avoid excessive oil temperatures (recommended ≤80°C) to prevent accelerated seal degradation.

3. Troubleshooting

• Weak Travel Force: Inspect for spool jamming, broken springs, or insufficient hydraulic pump pressure.

• Loss of Direction Control: Verify pedal sensor signals (for electro-hydraulic models) or check for internal valve leakage.

• Abnormal Noise: Tighten valve body mounting bolts and inspect for metal debris in the oil circuit.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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Main Product: hydraulic motor, gear box, hydraulic pump, hydraulic valve , hydraulic winch , hydraulic system

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