ATUS-Piston Fixed Pumps-APF-PFB PVB-500×1000-1

APF-PFB-10.5

APF-PFB Series Axial Piston Fixed Pump
Size NG
5
Displacement
10.5 cm³/rev
Speed
1800 rpm
Flow
18.9 L/min
Nominal pressure
210 bar
Max. Pressure
280 bar
Weight (approx.)
8 kg

Products and performance

The APF-PFB series of fixed-displacement axial piston pumps is engineered for high-reliability and high-precision applications. Featuring advanced axial piston technology and a compact design, this series ensures stable and reliable performance. By utilizing the reciprocating motion of pistons within the cylinder block to intake and discharge fluid, the pump maintains a constant hydraulic flow, meeting the critical need for stable hydraulic power across various industrial applications.
This article focuses on the NG 5 model, which features a fixed displacement of 10.5 cm³/rev. The pump supports operating speeds of up to 1800 rpm, delivering a rated flow of 18.9 L/min under optimal conditions. Designed for heavy-duty, high-pressure environments, it has a nominal operating pressure of 210 bar and can withstand intermittent peak pressures of up to 280 bar. Optimized rotating components and an enhanced bearing configuration effectively minimize vibration and noise during high-speed operation, ensuring excellent volumetric efficiency and a long service life in continuous-cycle applications.
This series of pumps is ideal for constant flow applications, with a maximum speed of 1800 rpm and high operating efficiency. Thanks to its superior performance and durability, this pump is widely used in engineering machinery, oil fields, ships, and other mechanical fields. Its compact size and high power density simplify system layout, making it an ideal hydraulic power source for space-constrained high-pressure equipment.

Stable Performance

High efficiency and stable output under prolonged high-load operation to ensure reliable hydraulic system operation.

Compact Structure

Compact design enables easy installation on space-restricted equipment and improves the flexibility of overall equipment layout.

Extended Service Life

Featuring an extended operational lifespan, these pumps effectively cut maintenance costs and lower the frequency of component replacement.

Cost-Effective

Delivers high cost performance, providing users with economical hydraulic power solutions.

Constant Flow Supply

Provides stable flow rate, indispensable for applications requiring consistent hydraulic performance.

Specifications

Standard NG5 frame size features exquisite structural integration, saving installation space and perfectly matching various medium and small engineering machinery assemblies.
With 10.5 cm³/rev fixed displacement, it delivers balanced and steady power output without surge, adapting to stable industrial operation demands.
The rated 1800 rpm operating speed realizes low-noise and low-vibration operation, suitable for long-time continuous mechanical work.
It provides a stable 18.9 L/min constant flow, ensuring precise and coordinated movement of various hydraulic execution components.
Designed with 210 bar nominal pressure, it stably bears conventional heavy loads and meets daily working needs of engineering equipment.
Supporting 280 bar maximum pressure, it resists instantaneous pressure impact and greatly improves hydraulic system safety margin.
The lightweight 8 kg overall weight reduces equipment dead load, effectively lowering energy consumption and improving operation flexibility.
It adapts to complex scenarios such as engineering machinery, oil fields and ships, with strong durability and wide industrial applicability.

Product Features of the APF-PFB Series Fixed-Displacement Axia Piston Pump

Efficient & stable performance;
Stable output under long-term high loads;
Ensures reliable hydraulic system operation;
Compact size, simple installation;
Flexible layout for space-limited machinery;
Long service life, lower maintenance cost;
Constant flow rate, consistent hydraulic performance;
- 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.
- 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.
- 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
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.
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.
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.
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.
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.
Installation Drawing
Download
Installation Manual
Download
Operation Manual
Download
Parts Catalogue
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Report & Certifcate
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Other Models

197.5cm³/rev
Speed
1800 rpm
Flow
355.5 L/min
Weight(approx.)
104 kg
Nominal pressure
210 bar
94.5cm³/rev
Speed
1800 rpm
Flow
170.1 L/min
Weight(approx.)
96 kg
Nominal pressure
210 bar
61.6cm³/rev
Speed
1800 rpm
Flow
110.88 L/min
Weight(approx.)
26 kg
Nominal pressure
140 bar
42.8cm³/rev
Speed
1800 rpm
Flow
77.04 L/min
Weight(approx.)
26 kg
Nominal pressure
210 bar
33.0cm³/rev
Speed
1800 rpm
Flow
59.4 L/min
Weight(approx.)
15 kg
Nominal pressure
140 bar
21.1cm³/rev
Speed
1800 rpm
Flow
37.98 L/min
Weight(approx.)
15 kg
Nominal pressure
210 bar
13.8cm³/rev
Speed
1800 rpm
Flow
24.84 L/min
Weight(approx.)
8 kg
Nominal pressure
140 bar
10.5cm³/rev
Speed
1800 rpm
Flow
18.9 L/min
Weight(approx.)
8 kg
Nominal pressure
210 bar

FREQUENTLY ASKED QUESTIONS

Get quick answers about this engine

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Power OutPut
180 HP(132kW)
Max Torque
610 Nm
Displacement
5.9L
6 Inline
5.9L
Fuel System
Bosch Mechancial Pump
Emission Standard
Euro II

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