Shandong Shengyue Technology Development Co.,Ltd is one of the most professional kyb / kayaba axial piston pump for mini-excavators psvd2-27e psvd2-21e manufacturers and suppliers in China. Please feel free to buy high quality genuine auto parts at competitive price from our factory.
KYB / Kayaba Axial Piston Pump for Mini-Excavators PSVD2-27E PSVD2-21E
PSVD2-21E Compatible Models
IHI: 55NX, 60NS, etc.
Kubota: KX155, KX161, etc.
SANY: SY55, SY60 series, and other compact excavators
PSVD2-27E Compatible Models
Yanmar: ViO70, ViO75, ViO80 series
Takeuchi: TB175, TB180, and other heavy-duty compact excavators
Komatsu/Hitachi/Doosan: Hydraulic core replacement parts for select 7- to 8-ton class models
KYB Hydraulic Piston Pump Technical Specifications Comparison
| Technical Indicators / Parameters | Pump Model: PSVD2-21E | Pump Model: PSVD2-27E | Core Impact & Difference Remarks |
|---|---|---|---|
| Main Piston Pump Displacement (cc/rev) | 21 + 21 | 27 + 27 | 27E delivers higher flow rates, providing faster hydraulic cycle times and cylinder operating speeds. |
| Pilot / Gear Pump Displacement (cc/rev) | Approx. 5.0 ~ 7.5 | Approx. 7.5 ~ 10.5 | Supples pilot control pressure and secondary auxiliary circuits (e.g., dozer blade, swing motor). |
| Rated Operating Pressure (MPa) | 20.6 ~ 24.5 | 24.5 ~ 27.5 | 27E is engineered to withstand and sustain higher continuous working pressures. |
| Peak / Maximum Pressure (MPa) | 29.4 | 31.4 | 27E has a higher structural pressure threshold, granting greater breakout and digging force. |
| Adaptive Excavator Tonnage (Tons) | 5.5T ～ 6.5T | 7T ～ 9T | 21E is standard for mini excavators; 27E is matched with midi/compact excavators. |
| Pump Assembly Net Weight (kg) | Approx. 28 kg | Approx. 34 kg | 27E is slightly heavier due to enlarged cylinder blocks and piston diameters. |
KYB PSVD2-21E / 27E Hydraulic Pump Overhaul & Replacement BOM Detail
| Module Category | Component Name (EN) | Std. Qty | Maintenance / Overhaul Remarks & Suggestions |
|---|---|---|---|
| Rotary Kit (Core) | Cylinder Block | 1 | Critical Inspection: 9-hole cast-iron block. Must be replaced if the face or cylinder bores are scratched, worn, or showing severe internal leakage. |
| Rotary Kit (Core) | Piston Set with Shoes | 9 (1 Set) | Mandatory Replacement: Copper-coated sliding shoes. If the copper layer flakes off or ball joints loosen, it causes heavy noise; replace as a complete set. |
| Rotary Kit (Core) | Valve Plate | 1 | Mandatory Replacement: Specific to CCW or CW rotation. Forms a micro-level high-pressure seal against the cylinder. Single-sided wear spikes oil temperature. |
| Rotary Kit (Core) | Retainer Plate | 1 | Recommended: High-tensile spring steel plate. Holds piston shoes against the swash plate; replace immediately if deformed, cracked, or warped. |
| Rotary Kit (Core) | Thrust Plate / Set Plate | 1 | Recommended: Wear-resistant steel liner on the swash plate surface. Highly polished; deep scratches will quickly destroy new piston shoes. |
| Drive Component | Drive Shaft (Spline Shaft) | 1 | Replace as Needed: Inserts into the flywheel coupler. Check for worn spline teeth or twist distortion to prevent sudden shaft shearing. |
| Control Component | Power Regulator Valve Assy | 1 | Inspect & Clean: Controls swash plate tilting angle. Clogged spools or fatigued internal springs cause sudden engine stalling or extremely slow operation. |
| High-Frequency Seals | Pump Seal Kit (NBR/Viton) | 1 Set | 100% Mandatory Renewal: Includes shaft oil seal, casing O-rings, and gaskets. Must be replaced whenever the pump is opened to guarantee zero external oil leaks. |
| Coupling Hardware | Flywheel Rubber Coupling | 1 | Mandatory Renewal: Sits between engine flywheel and pump shaft. Becomes brittle and cracks from high engine heat; replace concurrently while the pump is off. |
| System Consumable | Anti-Wear Hydraulic Oil (ISO VG 46/68) | As Req. | Mandatory Refill: Old oil will contain metallic dust after pump failure. Must flush the tank and lines entirely before refilling, or the new pump will fail in hours. |
| System Consumable | Suction & Return Hydraulic Filters | 1 Set | Mandatory Renewal: Traps lingering metallic debris within the system loop; must be replaced in tandem with the fresh hydraulic oil. |
Hot Tags: kyb / kayaba axial piston pump for mini-excavators psvd2-27e psvd2-21e, manufacturers, suppliers, factory, parts, genuine, original
