Description

Mannesmann Rexroth A2FM, A2FE 1999 Technical Manual

You show up to a job with a hydraulic motor that won’t hold pressure, and the first thing you do is reach for a spec sheet you printed off some aftermarket site. That’s how you end up with a 400-bar motor running at 350 bar because the numbers didn’t match. I’ve seen it. The Mannesmann Rexroth A2FM, A2FE 1999 Technical Manual is not a reprint or a scan of a photocopy. It’s the original OEM document from Rexroth’s own engineering department, 134 pages, published April 1999. This is what you should be using when you rebuild or spec out these axial piston motors.

Page 3 gives you the full nominal size table from A2FM 5 all the way up to A2FM 1000. Capacity in cm³, max speeds, inlet flow, power at 400 bar, torque at 400 bar, and weight. Need a torque value for a NS 250 motor? Page 3 shows 1391 Nm at Δp=350 bar. That’s not a guess. That’s the factory number. You don’t get that from a parts-house catalog.

Coverage: A2FM and A2FE Fixed Displacement Motors

This manual covers both the standard A2FM motor and the plug-in A2FE version. The A2FE is designed for installation inside mechanical gearboxes, like Turas gearboxes. The mounting flange sits in the center of the housing, so you need exact dimensions and tolerances. The manual includes dimensional drawings and installation notes that aftermarket summaries leave out. If you’re adapting an A2FE into a gearbox, you need the original documentation to get the centering right.

What Pressures and Speeds Are Listed?

Nominal and peak pressures for every nominal size. For example, NS 5: 315 bar nominal, 350 bar peak. NS 10 to 200: 400 bar nominal, 450 bar peak. NS 250 to 1000: 350 bar nominal, 400 bar peak. Speeds range from 10,000 min⁻¹ for the little NS 5 down to 1600 min⁻¹ for the NS 1000. Page 3 has the full table. You don’t need to interpolate or guess.

3 Critical Specs You Need Before Rebuilding

First: the displacement (Vg). A2FM 63 has 63 cm³. Second: the max inlet flow – for A2FM 63 it’s 315 L/min. Third: the torque at max pressure – 400 Nm for NS 63 at 400 bar. Those three numbers tell you if your application is within design limits. They’re all on page 3, right under the nominal size rows.

Use Factory Documentation, Not Aftermarket Reprints

I’ve had customers hand me third-party “compatible” manuals that listed wrong torque values for the mounting bolts. The Rexroth manual uses metric units. You’ll need to convert to inch-pounds if your torque wrench reads that way, but at least you have the right starting number. This manual is the real thing – original German engineering print, Mannesmann Rexroth AG, Jahnstraße 3-5, Lohr am Main. Not a scanned copy with smeared numbers. That matters when you’re torquing a 400 bar motor.

A2FE Plug-In Motor: Installation Considerations

If you work on Turas gearboxes or similar, the A2FE plug-in version requires precise alignment. The manual covers the integrated flushing valve options and brake valve mounting. Page 1 lists the electronic component info for the control blocks. You won’t find this level of detail in a generic hydraulic book. For related Rexroth documentation, check the Mannesmann Rexroth SP-08 Technical Manual – Factory OEM Specs and the Mannesmann Rexroth A2F 1996 Repair Manual – Factory OEM Specs. Also see the Drogobych Crane КТА-16, КТА-25, КТА-28 2004 Installation Manual for crane motor applications.

For general background on how axial piston motors work in drivelines, the Wikipedia article on Manual Transmission gives context, but this manual gives the hard numbers.

FAQ

Does this manual cover the A2FM 5 nominal size with torque values?

Yes, page 3 lists all nominal sizes from 5 to 1000, including torque at 400 bar for each size. For A2FM 5, torque is 25 Nm at 315 bar.

What is the difference between the A2FM and A2FE versions according to this manual?

The A2FM is the standard flange-mounted motor. The A2FE is a plug-in version designed for installation inside mechanical gearboxes, with the mounting flange located in the center of the housing. The manual includes specific installation notes for the A2FE, including integrated flushing valve options and brake valve mounting. It also notes that the A2FE is only available up to nominal size 355 (A2FM goes to 1000). The weight and capacity tables show both versions side by side for sizes 28, 32, 45, 56, 63, 80, 90, 107, 125, 160, 180, 200, 250, 355 – the A2FE is listed only for those sizes that share the same displacement and speed ratings. If you’re installing a plug-in motor, you need the centering dimensions and the brake valve fitting instructions; the manual provides those on pages not scanned in the preview, but the OEM document contains the full engineering drawings.

You’re paying for the original OEM 134-page technical manual from Mannesmann Rexroth, not a third-party compilation. The torque tables, pressure limits, and dimensional data are verified by the factory. When you order, you get the full PDF – no watermarks, no missing pages.

Access the Factory Manual and keep it on your tablet next to the workbench.