Description

Mannesmann Rexroth SP-08 Technical Manual

I’ve been wrenching for 28 years, and the one thing that separates a job done right from a comeback is having the right specs in front of you. The Mannesmann Rexroth SP-08 Technical Manual is exactly that—36 pages of factory print, not some aftermarket rehash that skips the important numbers. If you’re working on a load-sensing control block, this is the document you want on your bench. No guesswork, no third-party diagrams that don’t match the ports. This is the same manual that Rexroth shipped with the component series 2X blocks.

What Systems Does the SP-08 Cover?

This manual walks through both Open Center (fixed displacement pump) and Closed Center (variable displacement pump) configurations. The load-sensing principle is the core—flow stays independent of load pressure. You get sections on inlet elements, directional valve elements with pressure compensators, and end elements. The ordering code chapter (pages 6–9) shows exactly how to decode your block’s build. Without that, you’re guessing which springs and orifices are inside. That leads to leaks or blown seals. I’ve seen it happen.

Technical Data and Pressure Limits

Pages 4 and 5 list the nominal pressures: pump side 300 bar for mono-block, 250 bar for sections; actuator side 320 bar and 300 bar respectively. Maximum flow on pump side is 140 L/min, actuator side 70 L/min for mono-block. These numbers matter when you’re retrofitting a block into a crane or municipal vehicle. Exceed them and you’ll crack a casting. The manual also includes characteristic curves for the inlet elements—critical for setting the pump compensator. A YouTube video won’t give you that. Manual Transmission rebuilds have their own specs, but hydraulic control blocks need this kind of precision.

36 Pages of Verified Factory Specs

Why 36 pages? Because Rexroth doesn’t waste space. The unit dimensions run from page 26 to 33—every bolt pattern, pipe connection, and LS pressure cut-off dimension in millimeters. The mono-block and sandwich plate designs each have separate dimension sheets. If you’re fabricating a mounting bracket or swapping an inlet element, you need those numbers. I’ve seen DIYers try to measure with a tape and end up with a block that doesn’t fit the manifold. This manual kills that problem.

Inlet Elements: Open Center vs. Closed Center

The manual devotes pages 17–21 to inlet elements. Open Center designs work with fixed displacement pumps and include a priority valve option for steering circuits. Closed Center inlets use variable displacement pumps with LS pressure cutoff. The function descriptions are dense but precise—they tell you exactly how the spool shifts and what triggers the pressure relief valves. If your block has a stuck compensator, the troubleshooting path starts here. Don’t guess which spring is weak; the manual lists the compression spring specs.

Ordering Code and Block Assembly

Pages 10–13 give complete order examples for mono-block and sandwich plate designs—both Open and Closed Center. Each example shows the section arrangement and the corresponding ordering code. This is essential if you need to order replacement sections or add a directional valve element. The manual explains that mono-blocks can take up to 8 sections; sandwich plate designs allow up to 10 directional valve elements. Without the right code, you’ll get the wrong port configuration.

For related hydraulic manuals, check the Mannesmann Rexroth A2FM A2FE Fixed Displacement Motors Manual and the Mannesmann Rexroth A2F 1996 Repair Manual – Factory OEM Specs. If you’re working on crane installations, the Drogobych Crane КТА-16, КТА-25, КТА-28 2004 Installation Manual may also apply. And remember: when you’re swapping a transmission, a Manual Transmission manual is a different beast.

FAQ

Is this manual specific to the SP-08 or does it cover other models?

Only the SP-08. No cross-model data.

What kind of maintenance intervals are included?

This technical manual doesn’t list maintenance intervals—it’s a design and function document. It covers ordering codes, dimensions, inlet element behavior, and pressure compensator settings. For service intervals, you’d need the machine manufacturer’s manual. But if you’re rebuilding or modifying a load-sensing block, the characteristic curves on page 19 and the unit dimensions from page 26 onward give you the exact measurements to match replacements. If you need pump motor specs, the Mannesmann Rexroth A2FM A2FE Fixed Displacement Motors Manual is a good companion.

Bottom line: this is the document to access if you want to get the block right the first time. I’ve rebuilt enough Rexroth equipment to know that aftermarket PDFs leave out the ordering codes and unit dimensions that matter. Access the Factory Manual from AutoRepairManuals and keep it on your tablet next to your torque wrench.