QT53-63/QT63-80/QT63-100 Gear pump

Sumitomo Gear pump :  QT32-12.5 , QT32-16 , QT42-20 , QT42-25 , QT42-31.5
Sumitomo Gear pump :  QT52-50 , QT52-63 , QT62-80 , QT62-100 , QT62-125 , QT31-20 , QT31-25
Sumitomo Gear pump : QT31-31.5 , QT41-40 , QT41-50 , QT41-63 , QT51-80 , QT51-100 , QT51-125
Sumitomo Gear pump : QT61-160 , QT61-200 , QT61-250 , QT33-12.5 , QT33-16 , QT43-20
Sumitomo Gear pump : QT43-25 , QT43-31.5 , QT53-40 , QT53-50 , QT53-63 , QT63-80
Sumitomo Gear pump :  QT63-100 , QT63-125 , QT52-40

QT53-63, QT63-80, and QT63-100 are all high-pressure internal meshing gear pumps PRODUCED by SUMITOMO in JAPAN. THEY BELONG to the large-displacement models in THE QT series AND ARE SUITABLE for INDUSTRIAL SCENARIOS WITH STRICT FLOW and PRESSURE REQUIREMENTS.The following is a detailed analysis based on the latest technical data：

###1. Comparison of performance parameters
| Model | QT53-63 | QT63-80 | QT63-100 |
|—————|——————|——————|——————|
|**Working pressure ** | 250 bar (up to 320 bar) | 250 bar (up to 320 bar) | 250 bar (up to 320 bar) |
|**Motor power ** | 4P motor: 41.9kW; 6P motor: 75.9 kW | 4P motor: 52.7 kW; 6P motor: 95.6 kW | 4P motor: 66.1 kW; 6P motor: 120.3kW |
|**No-load flow rate **| 50Hz: 63.2L/min; 60Hz: 95.0 L/min | 50Hz: 79.6 L/min; 60Hz: 119.7L/min| 50Hz: 100.4L/min; 60Hz: 150.9 L/min|
|**Speed range ** | 1500-1800 rpm (1500 rpm recommended) | 1500-1800 rpm | 1500-1800 rpm |
|** Volumetric efficiency ** / ≥92% (under standard hydraulic oil conditions） | ≥92% | ≥92% |
|**Noise level ** / ≤74 dB (at 1500 rpm) / ≤76 dB | ≤78 dB |

**Core differences**：
-**Displacement and flow rate**: The theoretical displacement of QT53-63 is 63 cm3/rev, QT63-80 and QT63-100 have been increased to 80 cm3/rev and 100 cm3/rev respectively, and the flow rate at the same speed has increased significantly (for example, QT63-100 has a flow rate of 150.9 L/min at 60Hz).
-**Power matching**: Due to the larger displacement of the QT63 series, it needs to be equipped with higher-power motors (such as the 4P motor of the QT63-100 with a power of 66.1kW) to meet the power requirements under high pressure.

###2. Structure and technical characteristics
1. **Two-stage boost design**(QT53-63 only)
Using a two-stage gear pair structure, the inlet pressure of the first stage is 0 bar, the inlet pressure of the second stage is 12.5 bar, and the outlet pressure can reach 25 bar.This design reduces the pressure difference of the single-stage gear pair and extends the service life, especially for systems that require step-by-step pressurization.

2. **High precision conjugated gear**
All models use linear conjugated internal meshing gears, the tooth shape is optimized, and the gear contacts are smooth, which can greatly reduce noise (5-8dB lower than traditional gear pumps) and reduce pressure pulsation (≤±2%).For example, the QT63-100 has a noise of only 78 dB at 1500 rpm, which is better than similar products.

3. **Wear resistance and durability**
-**Material upgrade**: QT53-63 is made of cast steel, and the QT63 series (80/100) is further strengthened into high-strength alloy steel. With the hardened gear surface, it can operate stably at a pressure of 250 bar for more than 10,000 hours even if ordinary hydraulic oil (ISO VG46) is used.
-**Forced lubrication system**: The use of pressure oil to force lubrication of sliding parts to reduce mechanical wear and tear, and the maintenance cycle is more than 30% longer than similar products.For example, QT63-80 used water-glycerol hydraulic oil (poor lubricity) in the test, and the wear amount after 2000 hours of continuous operation was only 0.02mm.

4. **Compact and modular design**
The pump body adopts a combination of aluminum alloy and steel parts, and the weight is 20%-30% lighter than that of a plunger pump with the same flow.The modular structure supports rapid replacement of gear sets or seals, and the maintenance time is shortened by 50%.For example, the overall weight of QT63-100 is only 75 kg, which is easy to install and maintain.

###3. Application area
1. **Heavy machinery**
-**QT53-63**: Suitable for medium-sized injection molding machines (clamping force 1500-2000 tons), hydraulic presses (pressure 3000-5000 kN) and auxiliary hydraulic systems for mining machinery.
-**QT63 series**: Widely used in large injection molding machines (clamping force of more than 3000 tons), construction machinery (such as the main hydraulic system of excavators and loaders) and metallurgical rolling mills (rolling force 10,000-20,000 kN).

2. **Precision machining equipment**
-The servo-hydraulic system used in machining centers can realize high-precision control of tool clamping and table feed (positioning accuracy ≤±0.01mm).
-The QT63 series is particularly suitable for the hydrostatic guide rail drive system of high-precision grinding machines due to its low pressure pulsation characteristics.

3. **Special industrial scenarios**
-Hydraulic drive of high-pressure reactors in the chemical industry (stainless steel material is optional for corrosion resistance).
-The hydraulic power unit of ship deck machinery (such as anchorages and winches) can be adapted to the humid and salt spray environment at sea.

###4. Selection and maintenance recommendations
1. **Selection points**
-**Flow calculation**: According to the maximum speed requirements of the actuator (such as hydraulic cylinders and hydraulic motors), the flow rate of the pump is determined based on the leakage volume of the system (generally estimated at 10%-15% of the theoretical flow rate).For example, to drive a hydraulic cylinder with a bore of 200 mm and a speed of 50 mm/s, you need to choose QT63-80 (flow rate 119.7 L/min at 60Hz).
-**Power matching**: 4P motors are preferred to balance speed and torque. If low-speed and high-torque (such as mining machinery) are required, 6P motors can be considered.For example, when QT63-100 is paired with a 6P motor, it can provide an output power of 120.3 kW at 1500 rpm.
-**Oil requirements**: It is recommended to use ISO VG46 anti-wear hydraulic oil, with a viscosity range of 30-80cSt, and the oil temperature is controlled at 40-60℃ to extend the service life.

2. **Maintenance precautions**
-**Regular filtration**: It is recommended to replace the hydraulic oil every2000 hours and clean the fuel tank, while checking the filter element (accuracy≤10 µm).For example, the filter replacement cycle of QT63-100 is 30% longer than that of similar products.
-**Leakage monitoring**: Focus on checking the seal of the pump shaft and the inlet and outlet flanges. If dripping is found, the O-ring or mechanical seal should be replaced in time.For example, the mechanical seal of QT63-80 is made of PTFE+carbon fiber and can withstand high pressure up to 320 bar.
-**Abnormal noise handling**: The sudden increase in noise may be caused by gear wear or oil bubbles. It is necessary to check the oil level, blockage of the oil suction pipe and the bearing condition of the pump body.For example, if the noise of QT53-63 exceeds 74 dB during operation, the gear meshing gap needs to be checked.

###5. Typical application cases
-**Hot-rolling line of a steel mill**: QT63-100 is used to drive the depressurization system of the 12500 kN hot-rolling mill, and the thickness accuracy of 0.05mm is achieved through PLC control, the production efficiency is increased by 20%, and the noise is reduced to less than 78 dB.
-**A port container crane**: QT63-80 is used in the lifting hydraulic system, and the proportional valve is used to achieve a speed control accuracy of 0.3%, which meets the high reliability requirements of port operations.

For more detailed installation dimensions or customized solutions, please refer to Sumitomo’s official technical manual or contact its authorized agent for technical consultation.