APF-A2F-125
APF-A2F Series Piston Fixed Pumps
Size NG
125
Displacement
125 cm³/rev
Speed
3150 rpm
Nominal pressure
350 bar
Max. Pressure
400 bar
Torque p=350 bar
696 Nm
Mass (approx.)
63 kg
Products and performance
The APF-A2F series of constant displacement axial piston pumps are designed for high-reliability and high-precision applications. This series of pumps utilizes advanced axial piston technology and a compact design to ensure stable and reliable performance. By utilizing the reciprocating motion of the piston within the cylinder for fluid intake and discharge, the pump maintains a constant hydraulic flow rate, meeting the critical requirements for stable hydraulic power in various industrial applications.
This article introduces the NG 125 pump, which features a fixed displacement of 125 cm³/rev. It reaches a maximum speed of 3150 rpm and delivers 696 Nm torque at a working pressure of 350 bar. Designed for heavy-duty, high-pressure environments, this pump has a rated working pressure of 350 bar and can withstand intermittent peak pressures up to 400 bar. Optimized rotating components and enhanced bearing configuration effectively reduce vibration and noise during high-speed operation, ensuring excellent volumetric efficiency and a long service life in continuous cyclic applications.
This series of pumps is ideal for constant flow applications, operating at speeds from 2000 to 7500 rpm with high efficiency. With its superior performance and durability, it is commonly used in engineering equipment such as crane slewing hydraulic systems and winch hydraulic systems, and in industrial equipment such as high-speed mixers, conveyor belt drives, and fans. Its compact size and high power density simplify system layout, making it an ideal hydraulic power source for space-constrained high-pressure equipment.
This article introduces the NG 125 pump, which features a fixed displacement of 125 cm³/rev. It reaches a maximum speed of 3150 rpm and delivers 696 Nm torque at a working pressure of 350 bar. Designed for heavy-duty, high-pressure environments, this pump has a rated working pressure of 350 bar and can withstand intermittent peak pressures up to 400 bar. Optimized rotating components and enhanced bearing configuration effectively reduce vibration and noise during high-speed operation, ensuring excellent volumetric efficiency and a long service life in continuous cyclic applications.
This series of pumps is ideal for constant flow applications, operating at speeds from 2000 to 7500 rpm with high efficiency. With its superior performance and durability, it is commonly used in engineering equipment such as crane slewing hydraulic systems and winch hydraulic systems, and in industrial equipment such as high-speed mixers, conveyor belt drives, and fans. Its compact size and high power density simplify system layout, making it an ideal hydraulic power source for space-constrained high-pressure equipment.
Specifications
APF-A2F-125 General Information
Adopting the standard NG125 frame size, the pump achieves ideal volume-power matching, suitable for medium hydraulic systems without occupying excessive assembly space.
The fixed displacement of 125 cm³/rev delivers delicate fluid delivery volume, balancing high-speed operation efficiency and steady hydraulic output all the time.
Capable of running at a high rated speed of 3150 rpm, it meets the fast response demands of industrial high-speed equipment with smooth rotary performance.
It outputs rated torque of 696 Nm under 350 bar pressure, supplying powerful rotational driving force for crane slewing and winch driving stably.
Designed for 350 bar nominal working pressure, it adapts to rigorous heavy-duty hydraulic scenarios and sustains continuous high-pressure operation reliably.
With a peak pressure limit of 400 bar, it withstands instantaneous pressure shocks, greatly elevating the safety redundancy of the whole hydraulic system.
The total weight is merely 63 kg, the lightweight structure lessens the load of host machinery and optimizes equipment energy consumption effectively.
Perfect for crane slewing & winch hydraulic systems, as well as industrial high-speed mixing, conveyor and fan drive hydraulic units.
Product Features of the APF-A2F Series Fixed-Displacement Piston Pump
Bent-shaft structure fixed displacement piston pump/motor;
Pump or motor with fixed displacement, used in open or closed systems for hydrostatic transmission;
When used as a pump, flow rate is directly proportional to speed and displacement;
When used as a motor, output speed is directly proportional to flow rate and inversely proportional to displacement;
Output torque increases with the pressure difference between the high-pressure and low-pressure sides;
Spherical distribution plate between cylinder and distributor plate, automatically aligning during rotation, resulting in lower circumferential speed and higher efficiency;
Durable ball and roller bearings promote long service life;
Drive shaft can withstand radial loads;
Can use fire-resistant hydraulic oil;
Low noise;
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.
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01. What's the Standard Scopes of Supply?
With full ranges of emission standard from Euro 2 to Euro 7, Dongfeng Cummins producing 12 series automotive engines, started from 3.9 liter engine, to 15 liter engine, covering the power range of 125HP to 650HP.
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Max Torque
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Displacement
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6 Inline
5.9L
Fuel System
Bosch Mechancial Pump
Emission Standard
Euro II
02. What's the Available Optional Items?
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04. Engine Parts & Recommended Wear and Tear Parts
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