Yuken A37 piston pump for injection machine
The Yuken A37 is a variable displacement axial piston pump specifically engineered for the demanding hydraulic systems of injection molding machines, offering high efficiency, precise control, and reliable performance in medium-load applications.
🔧 Core Specifications
|
Parameter
|
Value
|
|
Displacement
|
36.9 cm³/rev (2.25 in³/rev)
|
|
Rated Pressure
|
16 MPa (2,320 PSI) continuous
|
|
Max Intermittent Pressure
|
21 MPa (3,050 PSI)
|
|
Speed Range
|
600–1800 rpm (max 1800 rpm)
|
|
Max Flow Rate
|
66.4 L/min (17.53 GPM) at 1800 rpm
|
|
Volumetric Efficiency
|
>98% at 16 MPa, 1800 rpm
|
|
Overall Efficiency
|
>90% at 16 MPa, 1800 rpm
|
|
Noise Level
|
62–68 dBA at 1500–1800 rpm
|
|
Oil Cleanliness Requirement
|
NAS 1638-9 class (≤10μm filtration)
|
|
Oil Viscosity Range
|
20–400 mm²/s (ISO VG 32/46 recommended)
|
|
Operating Temperature
|
0–60°C (32–140°F)
|
🧩 Model Code Breakdown (Example: A37-F-R-04-H-K-32)
|
Code
|
Meaning
|
Options
|
|
A37
|
Series/Displacement
|
A10(10cm³), A16(16cm³), A22(22cm³), A37(37cm³), A56(56cm³)…
|
|
F
|
Mounting Type
|
F=Flange, L=Foot
|
|
R
|
Rotation Direction
|
R=Clockwise, L=Counter-clockwise
|
|
04
|
Control Method
|
01=Pressure compensator, 04=Proportional load sensing
|
|
H
|
Pressure Level
|
B=16MPa, H=21MPa
|
|
K
|
Shaft Type
|
K=Keyed shaft
|
|
32
|
Design Number
|
Standard identifier
|
✅ Key Features for Injection Molding Applications
-
Swash Plate Efficient Design
-
Precise Control Capability
-
Durability and Reliability
-
Energy-Saving Features
🎯 Injection Molding Machine Applications
|
Machine Type
|
Recommended A37 Model
|
Key Benefits
|
|
Medium-sized machines (300–1000 ton clamping force)
|
A37-F-R-01-B-K-32
|
Balanced performance, cost-effective
|
|
High-precision molding
|
A37-F-R-04-H-K-32
|
Proportional control for precise filling and packing
|
|
Energy-saving retrofits
|
A37-L-R-04-H-K-32
|
Reduces power consumption, lowers oil temperature
|
|
Fast-cycling machines
|
A37-F-R-02-B-K-32
|
Quick response dual-pressure control
|
🛠️ Installation & Maintenance Guidelines
Installation Best Practices
-
Suction line: ≥100μm strainer, minimize length and bends
-
Return line: ≤25μm filtration, ensure proper cooling
-
Mounting: Use torque specifications for flange/foot connections
-
Alignment: Shaft misalignment ≤0.05mm (0.002″) to prevent bearing damage
Preventive Maintenance Schedule
|
Interval
|
Task
|
|
Daily
|
Check oil level, listen for abnormal noise, inspect for leaks
|
|
Weekly
|
Monitor oil temperature (≤60°C), check pressure stability
|
|
Monthly
|
Verify filter condition, clean if necessary
|
|
Quarterly
|
Replace oil filter, check oil cleanliness (NAS 8 class target)
|
|
6 Months
|
Inspect seals, check plunger/cylinder block wear
|
|
1 Year
|
Complete system oil change, comprehensive pump inspection
|
Critical Wear Limits
-
Plunger-to-cylinder block clearance: >0.05mm → replace
-
Swash plate/valve plate surface: significant scoring → repair/replace
-
Bearing play: >0.1mm → replace bearings
-
Case drain leakage: >1.5 L/min at max pressure → investigate internal wear
⚠️ Common Troubleshooting for Injection Molding Issues
|
Symptom
|
Likely Cause
|
Solution
|
|
Pressure fluctuation during injection
|
Control valve contamination, worn plunger shoes
|
Clean control circuit, replace worn components
|
|
Insufficient flow rate
|
Variable mechanism stuck, worn cylinder block
|
Disassemble and clean, check for wear
|
|
Excessive noise/vibration
|
Air in system, misalignment, worn bearings
|
Bleed system, realign coupling, replace bearings
|
|
High oil temperature
|
Internal leakage, inadequate cooling
|
Check case drain flow, upgrade cooling system
|
|
Unstable holding pressure
|
Poor cutoff characteristics, worn seals
|
Adjust pressure compensator, replace seals
|
🔄 Comparison with Other Yuken Series for Injection Molding
|
Series
|
Displacement
|
Pressure Rating
|
Best For
|
|
A37
|
36.9 cm³
|
16MPa (21MPa max)
|
Medium-sized machines (300–1000 ton)
|
|
A56
|
56 cm³
|
16MPa (21MPa max)
|
Large machines (1000–2000 ton)
|
|
A3H37
|
36.9 cm³
|
31.5MPa (35MPa max)
|
High-pressure applications (thin-wall molding)
|
|
A22
|
22 cm³
|
16MPa (21MPa max)
|
Small machines (<300 ton)
|
📌 Why Choose Yuken A37 for Injection Molding?
The A37 combines efficiency, precision, and durability in a compact package ideal for medium-sized injection molding machines. Its multiple control options allow for tailored performance to match specific molding processes, while the robust design ensures reliable operation even in continuous 24/7 production environments.
For injection molding applications requiring higher pressure (up to 35MPa), consider the A3H37 high-pressure variant. For energy-saving retrofits, the electro-hydraulic proportional control (04) models provide the best balance of performance and efficiency.
Would you like a concise checklist for selecting the right A37 model (control type, mounting, rotation, pressure rating) for your injection machine’s clamping force and cycle requirements?
