描述

A4FO Series Piston Pumps A4FO16 A4FO22 A4FO28 A4FO40 A4FO71 A4FO125 Rexroth Hydraulic Pumps

Rexroth A4FO28 Series – Fixed Displacement Axial Piston Pumps (16–125 cm³/rev)

The A4FO series comprises Rexroth’s swashplate‑type axial piston fixed pumps, designed for open‑circuit hydraulic systems. Output flow is directly proportional to drive speed and displacement. The compact design includes a through‑drive facility for mounting additional pumps of the same nominal size in tandem.

Model Line‑Up and Key Parameters

• A4FO16 – 16 cc/rev, rated pressure 400 bar, peak 450 bar, max speed 3600 rpm, weight approx. 8‑10 kg.

• A4FO22 – 22 cc/rev, rated 400 bar, peak 450 bar, max 3600 rpm, weight 13.5 kg.

• A4FO28 – 28 cc/rev, rated 400 bar, peak 450 bar, max 3000 rpm, weight 13.5 kg.

• A4FO40 – 40 cc/rev, rated 400 bar, peak 450 bar (speed and weight comparable to the 16/22 variants within the same size group).

• A4FO71 – 71 cc/rev, rated 350 bar, peak 400 bar, max 2200 rpm, weight 34 kg.

• A4FO125 – 125 cc/rev, rated 350 bar, peak 400 bar, max 1800 rpm, weight 61 kg.

Note: Models 16 to 40 belong to Series 3 (size range 16‑40), while 71 and 125 are also Series 3 but in the 125‑500 size range. All variants can operate with HF fire‑resistant fluids, though derating applies for larger sizes.

Main Features

• Swashplate axial piston design, open‑circuit configuration

• Through‑drive capability for tandem pump arrangements

• SAE flange working ports

• Low noise emission and high overall efficiency

• Excellent self‑priming characteristics and fast response

• Optional control variants: DR (pressure control), LS (load‑sensing), or ED (electronic proportional control)

Typical Applications

• Mobile machinery: excavators, wheel loaders, telescopic handlers

• Mining equipment: drilling rigs, underground transporters

• Agricultural machinery: combine harvesters, tractors

• Industrial equipment: machine tools, hydraulic presses, injection moulding machines

• Marine and offshore systems

• Auxiliary circuits: pilot supply, fan drives, secondary functions

A4FO28 Maintenance and Spare Parts

Genuine‑quality replacement parts for the A4FO series are available, including cylinder blocks, drive shafts, piston assemblies, seal kits, and complete overhaul packages. Professional inspection and repair services are also offered. For maximum service life, maintain hydraulic fluid cleanliness to at least ISO 4406 18/16/13, and regularly monitor case‑drain flow as an early indicator of rotating‑group wear.

FAQ