Product Overview
The KOMATSU 561-43-8A221 is a genuine hydraulic pilot valve engineered for precise, low-effort actuation of main directional control valves within Komatsu heavy equipment hydraulic systems. Operating as a pressure-reducing, manually actuated pilot control valve, it converts operator lever or pedal input into proportional pilot pressure signals that shift the main spool of directional control valves. This pilot valve is a critical interface component in load-sensing and open-center hydraulic circuits, delivering smooth, metered pilot pressure for boom, arm, bucket, swing, and travel functions. Manufactured to Komatsu OEM tolerances, the 561-43-8A221 ensures repeatable spool positioning, minimal hysteresis, and reliable return-to-neutral behavior under continuous duty cycles in construction and mining environments.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Hydraulic Pilot Valve (Standard Directional Control Valve) |
| Model Designation | KOMATSU 561-43-8A221 |
| Operating Pressure | Standard Industrial Grade (Pilot circuit up to rated bar) |
| Mounting & Connection | Standard ISO / Komatsu OEM Interface |
| Actuation Method | Manual Lever / Pedal with Spring-Centered Return |
| Spool Configuration | Proportional Pressure-Reducing Pilot Spool |
| Fluid Compatibility | Mineral-Based Hydraulic Oil (ISO VG 32–68) |
Engineering Features & Advantages
- Precision Performance: Fine-tuned pilot spool metering delivers smooth, proportional pressure signals to main directional control valves, enabling accurate and responsive machine control with minimal operator effort.
- Low Hysteresis & Repeatability: Precision-ground spool and bore clearances ensure consistent output pressure for each lever position, reducing drift and improving cycle-to-cycle repeatability.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, including high-vibration, high-cycle construction and mining duty.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original Komatsu OEM standards, ensuring drop-in installation without modification.
Typical Industrial Applications
The KOMATSU 561-43-8A221 pilot valve is used in hydraulic excavators, wheel loaders, bulldozers, and other Komatsu heavy equipment where precise pilot control of main directional valves is required. It is also found in mining machinery, material handling equipment, and industrial hydraulic systems that rely on Komatsu pilot-operated directional control circuits for boom, arm, bucket, swing, and travel functions.
PRODUCT IMAGES
KOMATSU 561-43-8A221 Hydraulic Pilot Valve
⚡ Emergency Plant Maintenance & Ready-to-Ship Notice:
- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
- Fast Dispatch: In-stock units ready for same-day dispatch via DHL / FedEx Express directly to your plant.
- Pre-Shipment Verification: High-definition photos, video testing runs, and serial number verification provided prior to shipment.
- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine KOMATSU 561-43-8A221 Hydraulic Pilot Valve. This Japan-made hydraulic component features a precise pilot-operated design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.