Energy‑Saving Performance
Automatic displacement adjustment reduces energy and hydraulic oil waste while keeping the whole hydraulic system stable in operation.
APV-A10V(S)O 31-71
APV-A10V(S)O 31 Series Axial Piston Variable Pumps
Size NG
71
Displacement
71 cm³/rev
Speed
2200 rpm
Flow
156 L/min
Nominal pressure
280 bar
Max. Pressure
350 bar
Weight (approx.)
33 kg
Products and performance
The APV-A10V(S)O 31 series constant displacement axial piston pumps utilize advanced swashplate variable displacement technology, providing reliable and efficient hydraulic performance for heavy-duty industrial systems. By adjusting the swashplate angle to change the piston stroke, the pump can flexibly adjust its displacement and precisely adapt to the constantly changing hydraulic power and torque requirements under different operating conditions, thus achieving excellent controllability and operating efficiency. This series of pumps operates from 1800 to 3300 rpm, enabling flexible system-adaptive displacement adjustment for energy-saving flow control.
The NG71 pump has a displacement of 71 cm³/rev, a rated speed of 2200 rpm, and a maximum stable flow rate of 156 L/min. Its rated operating pressure is 280 bar, with a peak pressure reaching 350 bar, enabling continuous high-pressure operation under harsh conditions.
The APV-A10V(S)O 31 series pumps feature excellent high torque output and stable variable flow performance; flow rate is proportional to transmission speed and displacement. They are widely used in hydraulic systems of engineering machinery, die-casting machines, injection molding machines, chemical equipment, etc., providing efficient, stable, and energy-saving hydraulic support. They are reliable core components of heavy-duty hydraulic systems.
The NG71 pump has a displacement of 71 cm³/rev, a rated speed of 2200 rpm, and a maximum stable flow rate of 156 L/min. Its rated operating pressure is 280 bar, with a peak pressure reaching 350 bar, enabling continuous high-pressure operation under harsh conditions.
The APV-A10V(S)O 31 series pumps feature excellent high torque output and stable variable flow performance; flow rate is proportional to transmission speed and displacement. They are widely used in hydraulic systems of engineering machinery, die-casting machines, injection molding machines, chemical equipment, etc., providing efficient, stable, and energy-saving hydraulic support. They are reliable core components of heavy-duty hydraulic systems.
Specifications
APV-A10V(S)O 31-71 General Information
The compact NG71 installation dimension enables easy layout, saves installation space and perfectly fits various narrow hydraulic assembly environments.
71 cm³/rev displacement provides well‑matched oil delivery, supports flexible flow regulation and achieves excellent power density for medium‑load operation.
The 2200 rpm high‑speed rating supports compact drive setup, offers fast load response and satisfies dynamic working requirements of host equipment.
Stable 156 L/min flow output supplies adequate oil for actuators, ensures smooth movement and improves the whole equipment cycle efficiency.
280 bar continuous nominal pressure delivers durable heavy‑duty power capacity, guaranteeing long‑term stable operation under normal working conditions.
350 bar maximum peak pressure resists sudden load impact, provides effective overload protection and strengthens anti‑shock performance of hydraulic system.
Light 33‑kg overall weight lowers mechanical load of host machine, simplifies transportation and mounting for compact and mobile equipment.
With broad industry adaptability, covering a variety of heavy-duty scenarios, it can be applied to hydraulic systems of engineering machinery, die-casting machines, injection molding machines, chemical equipment, etc.
Product Features of APV-A10V(S)O 31 Series Variable‑Displacement Axial Piston Pumps
Swashplate axial piston variable displacement pump for hydrostatic transmission in open circuits;
Flow rate is proportional to transmission speed and displacement;
Stepless flow rate variation is achieved by adjusting the swashplate angle;
Two housing drain ports;
Excellent suction characteristics;
Low noise level;
Long service life;
Ideal power-to-weight ratio;
Multiple control ranges;
Short control time;
This pump features a through-shaft drive and can be fitted with gear pumps or axial piston pumps of the same or smaller size, i.e., 100% through-shaft drive;
How to repair the mating pair of piston ball head and slipper inner ball socket.
- The factory assembly clearance between piston ball head and slipper ball socket is normally 0.015~0.025 mm.
- After prolonged service, the clearance enlarges. Parts can still be used if the clearance does not exceed 0.3 mm.
- Overlarge clearance will cause increased pulsation of pump outlet pressure and flow.
- In serious cases, loose slippers and slipper detachment may happen, further resulting in severe pump damage.
- Once signs of pressure and flow pulsation are detected, inspect slipper looseness in advance and conduct slipper re-clinching promptly.
How to repair the swash plate (thrust plate).
- After long-term operation, concave deformation will form on the flat surface of the swash plate.
- The workpiece can be surface-ground followed by nitriding treatment.
- If the removed material thickness (e.g. 0.2 mm) does not completely eliminate the original nitrided layer, re-nitriding may be omitted.
- Hardness inspection of the swash plate surface is mandatory in such cases.
What are the precautions for bearing replacement?
- Excessive bearing internal clearance will break the normal clearance of friction pairs and damage the oil film thickness of hydrostatic support, shortening the service life of piston pumps.
- The average service life of general bearings reaches 1000 hours (roughly more than two years). Bearings shall be replaced as appropriate after exceeding this service period.
- Replace with bearings of the identical model marked on the removed old bearing, or verified interchangeable alternatives.
- If grooves are scratched on the swash plate surface by piston ball heads (applicable to radial piston pumps), laser cladding with alloy powder is recommended for repair.
- Laser cladding ensures high bonding strength and hardness of deposited material without reducing the hardness of surrounding base metal.
- Manual overlay welding with chromium-type welding electrodes is an alternative method. The repaired swash plate surface requires re-heat treatment, preferably in a nitriding furnace.
- Regardless of the repair method adopted, the original dimensional accuracy, hardness and surface roughness of the swash plate must be restored.
Low oil Level Inclination Angle-Front Up
45 °
Low oil Level Inclination Angle-Back Up
45 °
Low oil Level Inclination Angle-Fuel Pump Side Up
45 °
Low oil Level Inclination Angle-Exhaust Side Up
45 °
Oil Sump Capacity-Upper Limit
14.2 L
Oil Sump Capacity-Lower Limit
12.4 L
Capacity of The Whole System
16.4 L
No Oil Suction / No Oil Discharge — Causes & Solutions
Main Causes and Troubleshooting Methods for Hydraulic Pump No Oil Suction / No Oil Discharge
- Damage to the hydraulic pump, pump motor, or coupling between motor and pump. Replace the faulty pump, motor or coupling in a timely manner.
- Too low oil level in the tank or excessively high pump installation position causes suction failure. Refill oil to the gauge level or adjust the pump height to keep the suction lift within the specified range.
- Oil impurities and increased viscosity block the suction filter and oil pipe. Clean pipes and filters regularly and replace with qualified hydraulic oil as required.
- Oil impurities and increased viscosity block the suction filter and oil pipe. Clean pipes and filters regularly and replace with qualified hydraulic oil as required.
Insufficient Pressure & Reduced Efficiency — Causes & Solutions
Main causes and troubleshooting methods for hydraulic pumps discharging oil but lacking pressure and exhibiting reduced efficiency.
- Severe wear of internal sliding parts leads to low volumetric efficiency and excessive axial/radial clearance. Replace the hydraulic pump or perform complete overhaul.
- Damaged oil pipes and poor suction-side sealing cause air intake. Check all connections, reseal joints or replace damaged pipelines.
- Blocked oil pipes and heavily contaminated filters. Clean pipelines and filters thoroughly to ensure full flow cleanliness.
- Incorrect variable pump adjustment and severely worn relief valve spool. Readjust flow parameters and replace worn relief valve components for stable pump operation.
- Motor speed below rated value and internal foreign impurities. Match the correct motor per specifications and clean internal impurities timely.
Severe Noise During Hydraulic Pump Operation — Causes & Solutions
Major Causes of Excessive Noise During Hydraulic Pump Operation and Methods for Troubleshooting
- Mostly caused by clogged filter, low oil level, air inhalation via oil seal and pipelines. Check tank oil level, repair pipelines, inspect pump seals, clean pipes and filters, and replace hydraulic oil periodically.
- Excessively high oil viscosity, low oil temperature and entrained air bubbles. Select suitable hydraulic oil according to seasons.
- Damaged coupling or misalignment between pump and motor leads to heavy vibration and loud noise. Inspect coupling wear, replace coupling and complete alignment strictly as installation requirements.
- Operating speed exceeds rated value and mismatched driving motor. Reduce pump speed and select a suitable motor.
- Worn shaft seal causes air intake; loose pump end cover bolts. Replace pump shaft seal and tighten cover bolts.
- Low gear precision, poor contact or damaged internal parts of gear pump. Replace or grind gears, renew damaged components.
- Insufficient axial clearance, out-of-tolerance perpendicularity or parallelism. Replace the gear pump entirely.
- Blockage inside relief valve. Clean or replace the relief valve.
- Vibration generated by unfixed pipelines. Secure all hydraulic pipelines firmly.
Hydraulic Pump Housing Oil Leakage — Causes & Solutions
Main Causes of Oil Leakage from Hydraulic Pump Bodies and Methods for Rectification
- Failure of the piston pump central spring breaks sealing between cylinder block and valve plate. Replace the spring and re-seal the mating surface.
- Damaged oil seals or worn/poorly fitted gaskets at pipeline connections. Replace all defective sealing parts.
- Severe wear of internal pump parts resulting in oversized operating clearances. Replace or refit the relevant components.
Excessive Temperature of Hydraulic Pump — Causes & Solutions
Main Causes of Hydraulic Pump Overheating and Troubleshooting Methods
- Excessively high or low oil viscosity, and accumulated impurities after long service. Replace hydraulic oil in a timely manner and adopt oil with proper viscosity.
- Heavy wear between pump side plates, shaft sleeves and gear end faces leads to overheating. Replace side plates, shaft sleeves or install a new hydraulic pump.
- Small tank volume restricts heat dissipation and triggers high oil temperature. Increase tank capacity and expand heat dissipation area.
Other Models
140cm³/rev
Speed
1800 rpm
Flow
252 L/min
Weight (approx.)
60 kg
Nominal pressure
280 bar
100cm³/rev
Speed
2000 rpm
Flow
200 L/min
Weight (approx.)
45 kg
Nominal pressure
280 bar
71cm³/rev
Speed
2200 rpm
Flow
156 L/min
Weight (approx.)
33 kg
Nominal pressure
280 bar
45cm³/rev
Speed
2600 rpm
Flow
117 L/min
Weight (approx.)
21 kg
Nominal pressure
280 bar
28cm³/rev
Speed
3000 rpm
Flow
84 L/min
Weight (approx.)
15 kg
Nominal pressure
280 bar
18cm³/rev
Speed
3300 rpm
Flow
59 L/min
Weight (approx.)
12 kg
Nominal pressure
280 bar
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6 Inline
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Fuel System
Bosch Mechancial Pump
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