Description

Bosch Rexroth A4VG56 2005 Parts Catalog – The Spare Parts Bible for That Pump

You have a Bosch Rexroth A4VG56 axial piston pump on the bench. Maybe it came off a telehandler, maybe a piece of mobile equipment. Now you need to order the right parts. Not a guess. Not a cross-reference from a third-party site. You need the factory Parts Catalog – the document that tells you exactly which locking screw goes in position 20, what part number the rotary group carries, and whether that seal is a D (sealing element) or an assembly group. This 39-page, 2005 OEM catalog from Brueninghaus Hydromatik GmbH is that doc. There is nothing else like it for the A4VG56DA1D4/32R-NZC02F013S variant.

If you have ever ordered a seal kit and found out the hard way that the shaft seal ring (pos. 38, R902601649) did not match the cradle bearing assembly (pos. 32, R909831304), you know the cost of guessing. This manual eliminates that. Every position is listed with its drawing number, part number, quantity, and whether it is an L (assembly group) or D (sealing element). That distinction matters: miss a sealing element, and you will be pulling the pump again. I have seen it happen. Do not be that guy.

Safety Notes: Why This Manual Matters

Page 1 of this catalog carries a bold statement: “Service and repair works have to be carried out by the Bosch Rexroth AG or their repair stations only.” That is not a suggestion. The A4VG56 runs at high pressures – the charge pressure on these units can exceed 5000 psi. If you are a home-garage guy, you should not be splitting the housing unless you have the right tooling and a clean bench. What this catalog does is give you the ability to identify every part so you can order exactly what a qualified shop needs. It also helps you verify a rebuild quote. That is where its value lies. You are not voiding warranty by reading a parts list – you are making sure you do not get sold parts that do not fit.

Rotary Group Exploded View: What Is Inside

Page 3 breaks down the ROTARY GROUP (position 1, R909607703). This is the heart of the pump. The list includes the control plate, cradle, slide ring, drive shaft, roller bearings, and the critical shaft seal ring. Each sub-component has its own part number. If you need the cradle bearing assembly (set), that is position 32, R909831304. The bearing liner (pair) is position 26, R902066592. Having the whole subassembly laid out in order prevents ordering the wrong bearing – a mistake that would trash the cradle bore and cost you a new housing (pos. 10, R902029600).

Control Hydraulic Section: Navigating the Logic

The catalog lists a CONTROL, HYDRAULIC assembly (position 2, R909601165) and a CONTROL ELEMENT (position 85, R909438806). These are the brains of the pump, managing displacement and pressure cut-off. If you need the INCH VALVE, HYDR. (position 5, R909438916) or the CONTROL CARTRIDGE (position 7, R909414719), you will find them with their own part numbers. No guesswork about which version fits the -F013S suffix. This is OEM data – Bosch Rexroth does not publish inaccurate part numbers.

Sealing Elements and Torque Specs: The Difference Between a Leak and a Reliable Build

The catalog marks sealing elements with a “D” behind the quantity. For example, locking screw pos. 20 is a sealing element (1 ST D). That screw has an O-ring under the head; it needs to be torqued correctly. While this parts catalog does not list torque values – that belongs in the service manual – it tells you which fasteners have seals. Every sealing element must be replaced when you disassemble. Missing one will cost you a leak. The locking screws on the port plate (pos. 3 assembly) are also critical: there are four locking screws on pos. 22 (R909151692) that secure the port plate with valves. Use a new set every time.

3 Reasons to Choose OEM Documentation

First, aftermarket parts catalogs often use generic descriptions like “shaft seal” without the factory suffix. The Bosch Rexroth numbering system is specific: R902601649 is the correct shaft seal ring for this unit. Second, third-party suppliers may combine multiple variants under one listing, leading to mismatched parts. Third, OEM documentation includes the drawing number (R909716666) and version status (2/2005), so you can cross-reference with the unit’s nameplate. If the nameplate says A4VG56DA1D4/32R-NZC02F013S and the drawing number matches, you are holding the right catalog. There is no substitute for that.

Does This Catalog Cover the Full Pump Assembly?

Yes, it covers the main assemblies: rotary group, control hydraulic, port plate with valves, internal gear pump assembly, inch valve, control cartridge, housing, and all locking screws, pins, and sealing elements. Every position from 1 through 98 (including seal kit drive shaft pos. 98, R902002388) is listed. The catalog has 39 pages, but the actual item list runs from page 1 through page 3 for the main unit, with additional pages for subassemblies. All part numbers are drawn from the Brueninghaus Hydromatik parts system.

For related catalogs, check the Rexroth A4VG90DA1D4/32R-NZF02F021SH Parts List if you are working on a larger displacement pump. Also see the Rexroth A4VG71DA1D4/32R-NZF02F021SH Parts List for the mid-range variant. For a deeper understanding of the technology, the Bosch Rexroth A4VSO Variable Displacement Pump Technical Manual provides theory and schematics.

External resources: the Automotive Industry Overview on hydraulic systems and the Internal Combustion Engine page are useful background, but this catalog is the only place to get the parts right.

FAQ

Can I use this manual to rebuild the pump in my home garage?

No. The manual states service must be performed by Bosch Rexroth authorized repair stations.

What does the Rotary Group section show me that a generic parts list does not?

It lists every sub-component of the rotary group – from the control plate (pos. 2) to the seal kit drive shaft (pos. 98) – with original part numbers. Generic lists often combine the rotary group as one line item, making it impossible to order individual bearings, seals, or the cradle. With this catalog, you can order the exact cradle bearing set (R909831304) or plain roller bearing (R909156259) without buying an entire rotary group assembly. That saves money and reduces waste. The assembly group (L) vs. sealing element (D) notation also tells you which parts are single-use; you will not reuse a shaft seal ring after removal.

You have the pump. You have the nameplate data. Now get the factory document that tells you what goes where. Access the Factory Manual from AutoRepairManuals – the largest collection of OEM shop manuals in North America with verified factory specifications. No reprints, no third-party summaries. Original Bosch Rexroth 2005 Parts Catalog for the A4VG56 in PDF format, 39 pages.