Product Overview
The HG0-8-01R-VPC and HG2-125-01R-VPC-F are internal gear pumps from the HYTEK HG series. The HG0-8-01R-VPC features a displacement of 8.2 cm³/rev and belongs to the HG0 series (Group 0, small housing) . The HG2-125-01R-VPC-F delivers 125.3 cm³/rev and belongs to the HG2 series (Group 2, large housing) .
The HG series is HYTEK’s independently developed core product line, covering displacements from 8 to 180 cm³/rev, with a maximum working pressure of 35 MPa and maximum speed of 3,000 r/min. Featuring axial and radial pressure compensation technology, the pump maintains high volumetric efficiency even at low speeds and low viscosities. The high-strength cast iron housing with internal sound-dampening design delivers low-noise operation. The HG series is widely used in injection molding machines, die casting machines, cranes, forklifts, and other industrial hydraulic systems.
Every unit is manufactured to original equipment specifications, ensuring 100% drop-in interchangeability with genuine HYTEK HG series pumps without any system modifications. Each pump undergoes rigorous 100% simulated duty-cycle testing to validate pressure-flow-efficiency performance curves.
Brand Disclaimer: This product is a high-quality compatible replacement engineered for full interchangeability with HYTEK original equipment. All HYTEK brand names and model codes are referenced solely to indicate compatibility and interchangeability. This product is manufactured by an independent producer and is not an original HYTEK product.
Technical Specifications
HG Series General Specifications
Brand Series: HYTEK HG Series Internal Gear Pump
Product Type: Fixed Displacement Internal Gear Pump
Design Features: Axial and radial pressure compensation
Displacement Range: 8 – 180 cm³/rev
Rated Pressure: 315 bar (31.5 MPa)
Peak Pressure: 350 bar (35 MPa)
Maximum Speed: 3,000 r/min
Minimum Speed: 600 r/min (HG0) / 200 r/min (HG1/HG2)
Hydraulic Fluid: Mineral oil
Operating Temperature: -20°C to +80°C
Mounting: SAE standard flange mounting
Multi-Pump: Single and double pump combinations available (HG00, HG10, HG11, HG21, HG22)
HG0-8-01R-VPC
Model Code: HG0-8-01R-VPC
Frame Size: HG0 (Group 0)
Actual Displacement: 8.2 cm³/rev
Rated Pressure: 315 bar (31.5 MPa)
Peak Pressure: 350 bar (35 MPa)
Maximum Speed: 3,000 r/min
Minimum Speed: 600 r/min
Rotation Direction: Right-hand (Clockwise / R)
Shaft Type: Plain key (P)
Flange Type: SAE C flange (C)
Seals: VITON (Fluorocarbon rubber)
Weight: 4.4 – 4.6 kg
HG2-125-01R-VPC-F
Model Code: HG2-125-01R-VPC-F
Frame Size: HG2 (Group 2)
Actual Displacement: 125.3 cm³/rev
Rated Pressure: 315 bar (31.5 MPa)
Peak Pressure: 350 bar (35 MPa)
Maximum Speed: 3,000 r/min
Minimum Speed: 200 r/min
Rotation Direction: Right-hand (Clockwise / R)
Shaft Type: Plain key (P)
Flange Type: SAE C flange (C), flange port connection (-F)
Seals: VITON (Fluorocarbon rubber)
Weight: 48 kg
HG Series Additional Displacements Reference
HG0 Series (Group 0) : 8 (8.2), 10 (10.2), 13 (13.3), 16 (16.0), 20 (20.0), 25 (24.0) cm³/rev
HG1 Series (Group 1) : 25 (25.3), 32 (32.7), 40 (40.1), 50 (50.7), 63 (63.7) cm³/rev
HG2 Series (Group 2) : 63 (64.7), 80 (81.4), 100 (100.2), 125 (125.3), 145 (145.2), 160 (162.8) cm³/rev
Key Technical Advantages
1. Axial & Radial Pressure Compensation – High Efficiency
Advanced axial and radial pressure compensation technology automatically adjusts gear end and radial clearances, maintaining ≥94% volumetric efficiency even at low speeds and low viscosities.
2. Low-Noise & Low-Pulsation Design
The high-strength cast iron housing with internal sound-dampening design delivers extremely low noise operation. Pressure pulsation is significantly reduced, ensuring smooth system operation and extending component service life.
3. Excellent Contamination Resistance & Long Service Life
Internal gear pumps are insensitive to oil contamination. Combined with the high-strength cast iron housing and precision bearings, this ensures extended service life—ideal for injection molding machines, die casting machines, and other continuous-duty industrial hydraulic systems.
4. Broad Speed Range
HG series supports a wide speed range of 600 – 3,000 r/min (HG0) and 200 – 3,000 r/min (HG1/HG2). Maintains stable flow characteristics from low-speed precision control to high-speed continuous duty. Particularly suitable for servo variable-frequency drive energy-saving systems.
5. Complete Displacement Coverage & Multi-Pump Combinations
HG series displacements cover 8 – 180 cm³/rev across three frame sizes: HG0 (8–25 cc), HG1 (25–63 cc), and HG2 (63–160 cc) . Supports single and double pump combinations (HG00, HG10, HG11, HG21, HG22).
6. Optimized for Servo Systems
HG series is specifically engineered for servo drive systems, delivering rapid response to frequent speed changes and maintaining stable pressure and flow output at low RPM—the ideal choice for injection molding machine servo-hydraulic energy-saving systems.
7. 100% Simulated Duty-Cycle Testing
Every pump is 100% tested on dedicated hydraulic test benches under simulated real-world operating conditions—validating pressure-flow characteristics and efficiency curves at rated pressure (315 bar), peak pressure (350 bar), and full speed range—ensuring zero-defect, plug-and-play performance upon installation.
Application Areas
Injection Molding Machines: Servo hydraulic systems, energy-efficient oil pump systems
Die Casting Machines: High-pressure hydraulic systems
Shearing & Bending Machines: Hydraulic systems
Cranes: Hydraulic systems
Forklifts: Hydraulic systems
Shoe Machinery: Hydraulic systems
Sanitation Vehicles: Hydraulic systems
Servo Variable-Frequency Drive Energy-Saving Systems: Variable-speed drives, energy-efficient hydraulics
Expert Maintenance Tips
1. Fluid Cleanliness Control
Internal gear pumps have relatively low sensitivity to contamination, but maintain system fluid cleanliness to ISO 4406 19/17/14 or better as good practice. Install a ≤10 μm absolute filtration filter upstream of the inlet port.
2. Inlet Line Requirements
Keep suction lines short and straight with adequate diameter—not less than the port size. Inlet pressure must be maintained between 0.8 – 2.0 bar (absolute) to prevent cavitation.
3. Coupling Alignment Precision
Ensure pump shaft-to-drive shaft coaxiality deviation ≤0.05 mm and angular deviation ≤0.5° during installation. Flexible couplings are strongly recommended. If the drive involves sprockets or V-belt pulleys, an independent outboard bearing MUST be installed to protect the pump shaft.
4. First-Start Priming Procedure
Before initial startup, thoroughly bleed air through the drain port or a loosened outlet fitting. Perform 2–3 jog starts under no-load conditions (outlet open) until oil fills the pump cavity without air bubbles, then connect the load circuit for full operation.
5. Servo System Speed Matching
HG series is optimized for servo systems and operates stably across a wide speed range. Ensure that servo drive acceleration/deceleration parameters match the pump’s dynamic response characteristics to prevent cavitation or pressure shock from sudden speed changes.
6. Rotation Direction Confirmation
“R” indicates right-hand (clockwise) rotation; “L” indicates left-hand (counterclockwise) . Always verify that the drive motor/engine rotation matches the pump before installation.
