Description

Rexroth Bosch A4VG90DA1D4/32R-NZF02F021SH 2005 Parts Catalog

You want to rebuild a Rexroth Bosch A4VG90DA1D4/32R-NZF02F021SH axial piston unit. Maybe you’re chasing a hydraulic leak or swapping a blown rotary group. Without a factory parts catalog, you’re guessing part numbers, ordering wrong seals, wasting billable hours. This 38-page document from 2005 is the real deal—original Rexroth Bosch Group spare parts list. Not some third-party re-draw. Not a scan of a scan. It’s the same booklet that came off the line at Brueninghaus Hydromatik GmbH, Werk Elchingen. I’ve used these catalogs for years. They save your backside when the customer is waiting and the pump is on the bench.

Rotary Group Breakdown: Page 3 Parts List

Page 3 of this catalog lists the rotary group (part R902087352) with every component from the drive shaft to the cradle bearing assembly. You get exact Rexroth part numbers: R902079223 for the rotary group hydraulic section, R909449884 for the drive shaft, R909830165 for the cradle bearing assembly. Quantities are listed “1 ST” (one piece) or “2 ST” where needed. The page even marks assembly groups with an “L” and sealing elements with a “D”. That detail matters when you’re ordering seals separately. If you’ve ever had a seal kit arrive missing the shaft seal ring (R902601820), you’ll appreciate seeing it listed here on page 3.

Control Hydraulic Assembly: What You Need to Know

Position 2 in the main parts list is the control, hydraulic (R902016242). That’s the brain of the pump—adjusts swashplate angle, controls flow. The catalog doesn’t give you theory or adjustment procedures, but it tells you the exact replacement part number. Pair this with the Rexroth service manual for adjustment specs. If you’re rebuilding the control cartridge (pos. 7, R909414719), you’ll need those OEM numbers to avoid mixing up ports. I’ve seen guys order the wrong control element (pos. 85, R909442928) because they guessed. Don’t guess. Use the catalog.

Port Plate with Valves and Internal Gear Pump Assembly

Positions 3 and 4 cover the port plate with valves (R909608592) and the internal gear pump assembly (R909606810). The port plate handles high-pressure flow distribution; the gear pump provides charge pressure. These are high-wear items in mobile hydraulics. If you’re swapping a port plate, you need the correct valve configuration. This catalog shows the part numbers and quantities. No diagrams of internal oil passages—that’s in the repair manual—but for ordering, this is the document. Don’t waste time cross-referencing aftermarket charts that might mix up Rexroth A4VG series variants like the Rexroth A4VG71DA1D4/32R-NZF02F021SH Parts List or Bosch Rexroth A4VG56 Hydraulic Units Spare Parts List. Stick to the OEM list for your specific model.

Seal Kit and Sealing Elements: Pos. 98

At the bottom of page 1 you’ll find the complete seal kit (R902095527). It’s marked with a “D” for sealing element. One kit per pump. If you’re refreshing a used unit, order that seal kit plus any individual locking screws (pos. 20-22, 32-35) and orifice plugs (pos. 49, 54). The catalog lists all locking screws with Rexroth part numbers—R909153891, R909153815, R909153816. Each has a “D” designation, meaning they’re sealing elements. Replace them anytime you crack open the housing. Torque specs? Not here—that’s in the service manual. But if you want to verify fastener part numbers before ordering from Rexroth, this catalog has you covered.

3 Reasons You Want OEM Documentation, Not Aftermarket

First, aftermarket parts catalogs often merge multiple revisions into one confusing table. This 2005 catalog matches the specific status “2/2005” from Brueninghaus Hydromatik. Any revision after that will have a different document. Second, the part numbers here are direct from Rexroth Bosch—no reinterpreted codes. Third, safety: the original note on page 1 states service and repair must be done by Bosch Rexroth AG or their repair stations. That’s factory liability language. If you’re doing your own overhaul, you need to know exactly which parts are original. Aftermarket catalogs skip that warning. I’ve seen parts lists that omitted the inch valve (pos. 5, R902053428) entirely. This catalog doesn’t.

Who This Parts Catalog Serves

If you’re a shop owner with a Rexroth A4VG90 pump on the bench, or a mobile hydraulic technician rebuilding units for excavators or concrete pumps, this is your reference. Home garage guys? Only if you’re rebuilding a hydraulic pump for a piece of equipment and you have the skills to read an exploded parts list. Beginners will struggle because there’s no assembly instructions—just part numbers and quantities. Pair it with the Bosch Rexroth A4VSO Variable Displacement Pump Technical Manual for theory, or the actual service manual for tear-down. But for ordering parts, this catalog is the source.

Source Authenticity: 38 Pages of Factory Print

This is an original Rexroth Bosch Group publication from 2005, 38 pages, scanned from the actual printed spare parts list. The file name matches the drawing numbers listed inside. The header on every page says “Rexroth Bosch Group – Mobile Hydraulics – Axial Piston Units.” The footer shows “Brueninghaus Hydromatik GmbH, Werk Elchingen.” That’s the German factory. If you’ve ever dealt with aftermarket copies that have missing pages or smudged part numbers, you’ll notice the clarity here. Each page is dated 31.08.2005. You can trust that the part numbers are correct for the A4VG90DA1D4/32R-NZF02F021SH. For context on how these pumps fit into larger systems, you might read the Automotive Industry Overview or Internal Combustion Engine articles—though those are background, not hands-on.

FAQ

Does this catalog include torque values for assembly?

No. This is a parts list, not a service or repair manual. Torque specs, clearance measurements, and adjustment procedures are in the Rexroth Bosch service manual for the A4VG series.

Can I use aftermarket parts with the numbers from this catalog?

The catalog lists only Rexroth OEM part numbers. Many aftermarket suppliers offer cross-references, but the fit and sealing performance may differ. If you’re rebuilding a pump under warranty or for a critical application, use genuine Rexroth parts. The factory seal kit (R902095527) includes all O-rings and backup rings designed for the A4VG90 case pressure. Aftermarket kits sometimes substitute materials that break down at higher temperatures. I’ve seen failures from that. Your call, but the catalog gives you the OEM baseline. If you choose aftermarket, you’re on your own for validation.

38 pages, factory-correct part numbers, and the peace of mind that you’re not guessing. Access the Factory Manual to your tablet or print it out for the workbench. Keep it next to the pump when you’re tearing it down. You’ll save yourself a return trip to the parts counter.