Rexroth AZPF-11-008RCB20MB Gear Pump 0510425009

Bosch Rexroth AZPF-11-008RCB20MB (0510425009) Hydraulic External Gear Pump

The Rexroth 0510425009 hydraulic gear pump (type AZPF-11-008RCB20MB) is a fixed-displacement external gear pump that makes sure oil flows smoothly in small hydraulic power packs and industrial machines. It is based on Rexroth’s F-platform external gear technology and has excellent volumetric efficiency, low noise, and a long service life thanks to pressure-dependent gap sealing and strong slide bearings.

This unit is available in refurbished form, which makes it a cost-effective replacement for OEM installations while keeping the same high quality of Bosch Rexroth construction. It works for both general industrial hydraulics and mobile equipment that needs a small 8 cm³/rev pump that turns clockwise and has a rectangular flange for attachment.

Model Details

• Part number: 0510-425-009 (often written as 0510425009)

• Pump type: External gear pump, single pump

• Series / family: AZPF – Platform F external gear pump

• Model code: AZPF‑11‑008RCB20MB

• Function: Fixed‑displacement hydraulic pump

Tech Specs: Rexroth 0510425009

Key Performance Features

1. High Pressure Sealing System: Uses hydrostatic bearing balance and micro-metered axial thrust plates to maintain tight gear tooth boundary clearance, minimizing internal bypass slippage up to 280 bar.
2. Heavy-Duty Slide Bushings: Equipped with steel-backed PTFE/bronze 18 mm journal bearings designed to absorb radial load spikes from auxiliary auxiliary drive gears and PTO splines.
3. Optimized Displacement Tooth Profile: Precision-hobbed 12-tooth continuous run gear set minimizes flow ripple, fluid velocity pulsing, and acoustic emission levels during continuous duty.
4. Corrosion Protection: High-grade phosphatized surface conversion on end covers and hard-anodized extruded aluminum center section to resist marine atmospheres.
5. Standardized Modular Fit: Direct drop-in mounting interface compatible with European DIN/ISO rectangular 4-bolt pump brackets and Bellhousings.

Applications:

• Power units for hydraulic presses, clamping systems, and other similar industrial gear.
• Compact fixed-displacement pumps are used by mobile gear such as small loaders, agricultural attachments, and lifting equipment.
• Hydraulic auxiliary systems for steering, winches, and deck equipment in marine and offshore applications, where compatible with the original Rexroth code.
• Instrumentation and control systems for lubrication, cooling, and low-to-medium-flow actuation.
• The nameplate specifies the 0510425009 / 0510-425-009 code, which indicates that the pump is a replacement for an existing Bosch Rexroth AZPF-11-008 installation.

Frequently Asked Questions

What does the model code AZPF-11-008RCB20MB designate?

AZPF indicates Rexroth Series F external gear unit; 11 indicates standard 18 mm bearing journal size (Series 1X); 008 denotes 8.0 cm³/rev displacement; R specifies Clockwise rotation; C denotes a 1:5 conical taper shaft; B designates a 4-bolt rectangular front pilot flange (Ø80 mm); 20 specifies rectangular 4-bolt port connections; and MB designates standard NBR elastomer seals with a cast-iron rear cover.

Can the rotation of Rexroth 0510425009 be reversed from clockwise to counter-clockwise?

No, the AZPF-11-008RCB20MB is configured for Clockwise (Right-Hand) drive only. While some gear pump models allow internal conversion by repositioning thrust plates and swapping covers, it requires complete recalibration and seal kit alterations. Operating this specific unit counter-clockwise will cause seal blowout and catastrophic damage.

What hydraulic oil viscosity should be used with this pump?

Under normal continuous operating conditions, maintain a fluid viscosity between 20 and 100 mm²/s (cSt). Mineral-based hydraulic oils (HLP/HVLP according to DIN 51524) are recommended. For cold start conditions, maximum permissible viscosity is 800 mm²/s.

What is the maximum intermittent pressure rating for the 0510425009 pump?

The pump is rated for a continuous operating pressure of 250 bar (3,625 PSI) and an intermittent peak pressure of 280 bar (4,060 PSI).

What are the primary indicators that an AZPF gear pump requires replacement?

Key symptoms include elevated high-frequency whining noise (indicating cavitation or bearing galling), reduced system operating speed under full load (indicating high internal bypass slip caused by scored thrust plates), and fluid overheating due to excessive internal volumetric leakage.