Description

Bosch Rexroth A10VO Technical Manual – Factory Hydraulic Pump Data

If you’re rebuilding a hydrostatic drive or troubleshooting a pump that won’t hold pressure, you need the OEM numbers – not some third-party summary. I’ve had guys bring me pumps that were set to a deadband that didn’t even exist in the real factory spec because they trusted a copied document. This Bosch Rexroth A10VO Technical Manual is the real deal. Printed from the original Bosch Rexroth data sheet RE 92705/06.09, it gives you the exact ordering codes, pressure limits, and control options for the A10VO Series 32 across sizes 71, 100, and 140. Thirty-two pages of factory information that belong on your bench, not on a screen with 20 ads.

Technical Data – Pressure, Fluid, and Size Determination

Page 4 starts with the numbers that matter: nominal pressure 280 bar, peak 350 bar. Open circuit only. Then you get fluid specs – ISO VG 46 or similar mineral oils, with specific viscosity limits. The manual walks you through determination of size using the actual displacement data (71, 100, 140 cm³) and torque limits. Need the permissible radial and axial forces on the drive shaft? That’s in the same section, broken down by shaft type and mounting flange. Don’t guess – these values keep you from snapping a shaft on first startup. The manual includes a calculation table for input and through drive torques with distribution formulas. That’s the kind of detail that separates a working system from a failure.

DG Two‑Point Control – Setting the Deadband Correctly

Page 8 covers the DG two‑point control, directly operated. If you’ve ever had a pump cycle between full stroke and zero without staying put, you know the deadband adjustment is critical. This manual shows the internal porting and the pressure settings for the control spool. It’s not just a diagram – there are specific test bench pressure values and spring codes. Aftermarket manuals often skip the spring identification. Here, you get the factory ordering code for the whole control assembly. Bosch Rexroth A4VSO 1997 Technical Manual – Factory Specs covers a different series but has the same commitment to complete data.

DR, DRG, DRF/DRS, and LA Controls – Which One Do You Have?

The manual dedicates a page to each controller: DR (pressure control, page 9), DRG (remote pressure control, page 10), DRF/DRS (pressure and flow control, page 11), and the LA series (pressure, flow, and power control, page 12). Each includes controller data – pilot pressure ranges, flow settings, and override characteristics. For the LA controls, there are eight sub‑variants (LA5D through LA9D) based on the beginning of control pressure. You’ll find the exact setting range for each in the notes section. If you’re retrofitting a different control, this is where you confirm compatibility.

Dimensions and Drive Shafts for Sizes 71, 100, 140

From page 14 through 28, you get full dimensional drawings for all three sizes. Port layouts – SAE flange ports at rear (code 11) or SAE ports with metric mounting bolts (code 12). Drive shaft options: splined shaft ANSI B92.1a‑1976 standard (S), higher torque version (R), reduced diameter for through drive (U), and the high‑torque reduced version (W). Each drawing includes mounting flange details: two‑bolt (C) or four‑bolt (D). If you’re fitting this pump into a tight engine bay, these dimensions are the difference between a clean install and a custom bracket nightmare. Bosch Rexroth A10VSO Series 32 Technical Manual is a separate document but follows the same dimensional standards.

Installation Instructions – Don’t Skip the Port Plate Alignment

Page 30 has the installation instructions. Bosch Rexroth specifies a maximum case pressure of 20 bar absolute at the drain port and gives the exact tightening torque for the mounting bolts (M10 – 50 Nm +5 Nm, M12 – 85 Nm +10 Nm). The manual also warns about aligning the port plate gasket – if it’s off by 1 mm you’ll get internal leakage that kills efficiency. There’s a note on flushing the system before startup: clean oil, correct filtration (ISO 4406 class 20/18/15 minimum). I’ve seen a new pump grenade in 20 minutes because someone skipped the flush. The manual doesn’t let you skip it. Bosch Rexroth External Gear Pumps Series F is a different pump type but the same attention to installation detail.

Source Validity – Why OEM Bosch Rexroth Documentation Matters

This is an original Bosch Rexroth data sheet, not a scanned copy from a third‑party aggregator. I can tell from the ordering code table on page 2 and the consistent formatting across all 32 pages. Aftermarket “reprints” often cut the dimension pages or flatten the color coding for port identification. Here, the PDF is the same as what Bosch Rexroth released in June 2009 (RE 92705/06.09). If you need the through‑drive dimensions for a combination pump A10VO + A10VO, page 26 has the exact moment of inertia limits and mounting options. You won’t find that in a generic hydraulic manual. Manual Transmission is irrelevant to this pump, but if you’re working on a vehicle with a manual transmission and a hydraulic pump, the same principle applies – use the factory spec.

For additional context on pump control theory, Manual Transmission links to a reliable external source, but nothing beats having the actual data sheet on your tablet while you’re adjusting the DRG remote pressure control.

FAQ

Is this manual available in imperial units?

No, it’s metric – bar and mm. Adapt your tools.

Does the manual cover all control options like DR, DRG, LA, and DG?

Yes. Pages 8 through 12 cover every control variant listed in the ordering code: DG (two‑point), DR (pressure), DRG (remote pressure), DRF/DRS (pressure and flow), and all LA configurations (LA5D through LA9D, plus LA.DG and LA.DS). Each section includes controller data, pilot pressure values, and setting instructions. The DRF section also distinguishes between X‑T open and X‑T closed with flushing function.

Bottom line: if you’re rebuilding an A10VO or setting up a new installation, stop working off a blurry screen capture. Buy the actual factory data sheet. I’ve got no patience for guesswork when 350 bar of hydraulic pressure is involved. Access the Factory Manual and get the right numbers the first time.