APF-A2FO-180
APF-A2FO Series Axial Piston Fixed Pump
Size NG
180
Displacement
180 cm³/rev
Speed
1450 rpm
Nominal pressure
400 bar
Max. Pressure
450 bar
Flow
261 L/min
Mass (approx.)
45 kg
Products and performance
The APF-A2FO series of fixed-displacement axial piston pumps is engineered for high reliability and precision. Utilizing advanced axial piston technology and a compact design, these pumps ensure stable and reliable performance. By employing the reciprocating motion of pistons within the cylinder block to draw in and discharge fluid, they maintain a constant hydraulic flow—a critical requirement for various industrial applications demanding steady hydraulic power.
This introduction focuses on Size NG 180 variant, featuring a fixed displacement of 180 cm³/rev. It supports a maximum operating speed up to 1450 rpm, delivering a rated flow of 261 L/min under optimal working conditions. Built for heavy-duty high-pressure operation, the pump achieves a nominal working pressure of 400 bar and can withstand intermittent peak pressure up to 450 bar. Optimized rotary assembly and reinforced bearing configuration suppress vibration and noise under high rotational speed, securing outstanding volumetric efficiency and extended service life during continuous cyclic operation.
Ideally suited for applications requiring constant flow, this series operates efficiently within a speed range of 1,320 to 5,600 rpm. Thanks to their exceptional performance and durability, these pumps are widely used in sectors such as industrial and factory automation, mobile machinery, renewable energy, the steel industry, marine applications, and offshore drilling platforms. Its compact outline and high power density simplify system layout, making it an optimal hydraulic power source for space-limited high-pressure equipment.
This introduction focuses on Size NG 180 variant, featuring a fixed displacement of 180 cm³/rev. It supports a maximum operating speed up to 1450 rpm, delivering a rated flow of 261 L/min under optimal working conditions. Built for heavy-duty high-pressure operation, the pump achieves a nominal working pressure of 400 bar and can withstand intermittent peak pressure up to 450 bar. Optimized rotary assembly and reinforced bearing configuration suppress vibration and noise under high rotational speed, securing outstanding volumetric efficiency and extended service life during continuous cyclic operation.
Ideally suited for applications requiring constant flow, this series operates efficiently within a speed range of 1,320 to 5,600 rpm. Thanks to their exceptional performance and durability, these pumps are widely used in sectors such as industrial and factory automation, mobile machinery, renewable energy, the steel industry, marine applications, and offshore drilling platforms. Its compact outline and high power density simplify system layout, making it an optimal hydraulic power source for space-limited high-pressure equipment.
Specifications
APF-A2FO-180 General Information
Compact NG180 specification realizes high power density. Small overall dimensions facilitate installation on compact machinery and optimize layout for limited installation space.
180 cm³/rev fixed displacement delivers steady constant flow output. It guarantees consistent hydraulic power and avoids flow fluctuation during continuous operation.
Supports maximum speed up to 1450 rpm. High rotational speed enables sufficient flow output within limited installation size to meet compact unit power demands.
400 bar nominal working pressure adapts to heavy-duty high-pressure working conditions. It provides sufficient hydraulic thrust for high-load industrial and mobile equipment.
450 bar peak pressure offers reliable overload capacity. The pump can cope with instantaneous pressure surges and effectively protect the whole hydraulic system.
Rated flow reaches 233 L/min, supplying continuous stable fluid delivery. Satisfies the continuous actuation requirements of multiple hydraulic actuators simultaneously.
Approximate mass of only 45 kg lowers equipment overall load. Lightweight structure helps reduce machine energy consumption and improve maneuverability.
Used in industrial and factory automation, mobile machinery, and renewable energy, such as the steel industry, ships and offshore drilling platforms.
Product Features of the ATUS-A2FO Series Axial Piston Fixed-Displacement Pump
Fixed-displacement pump featuring an axial tapered piston rotary group with a bent-axis design, intended for hydrostatic drives in open circuits;
Suitable for mobile machinery and stationary applications;
Flow rate is proportional to drive speed and displacement;
Drive shaft bearings are designed to meet the service life requirements typical of these applications;
High power density;
Compact dimensions;
High overall efficiency.
Economical design.
One-piece conical piston with sealed piston ring.
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
355cm³/rev
Speed
1320 rpm
Flow
469 L/min
Mass(approx.)
110 kg
Nominal pressure
350 bar
250cm³/rev
Speed
1500 rpm
Flow
375 L/min
Mass(approx.)
73 kg
Nominal pressure
350 bar
200cm³/rev
Speed
1550 rpm
Flow
310 L/min
Mass(approx.)
66 kg
Nominal pressure
400 bar
180cm³/rev
Speed
1450 rpm
Flow
261 L/min
Mass(approx.)
45 kg
Nominal pressure
400 bar
160cm³/rev
Speed
1450 rpm
Flow
233 L/min
Mass(approx.)
45 kg
Nominal pressure
400 bar
125cm³/rev
Speed
1600 rpm
Flow
200 L/min
Mass(approx.)
32 kg
Nominal pressure
400 bar
107cm³/rev
Speed
1600 rpm
Flow
171 L/min
Mass(approx.)
32 kg
Nominal pressure
400 bar
90cm³/rev
Speed
1800 rpm
Flow
162 L/min
Mass(approx.)
23 kg
Nominal pressure
400 bar
80.4cm³/rev
Speed
1800 rpm
Flow
145 L/min
Mass(approx.)
23 kg
Nominal pressure
400 bar
63cm³/rev
Speed
2000 rpm
Flow
126 L/min
Mass(approx.)
18 kg
Nominal pressure
400 bar
56.1cm³/rev
Speed
2000 rpm
Flow
112 L/min
Mass(approx.)
18 kg
Nominal pressure
400 bar
45.6cm³/rev
Speed
2240 rpm
Flow
102 L/min
Mass(approx.)
14 kg
Nominal pressure
400 bar
32cm³/rev
Speed
2500 rpm
Flow
80 L/min
Mass(approx.)
9.5 kg
Nominal pressure
400 bar
28.1cm³/rev
Speed
2500 rpm
Flow
70 L/min
Mass(approx.)
9.5 kg
Nominal pressure
400 bar
22.9cm³/rev
Speed
2500 rpm
Flow
57 L/min
Mass(approx.)
9.5 kg
Nominal pressure
400 bar
16cm³/rev
Speed
3150 rpm
Flow
50 L/min
Mass(approx.)
6 kg
Nominal pressure
400 bar
12cm³/rev
Speed
3150 rpm
Flow
38 L/min
Mass(approx.)
6 kg
Nominal pressure
400 bar
10.3cm³/rev
Speed
3150 rpm
Flow
32 L/min
Mass(approx.)
6 kg
Nominal pressure
400 bar
4.93cm³/rev
Speed
5600 rpm
Flow
27.6 L/min
Mass(approx.)
2.5 kg
Nominal pressure
315 bar
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