German Rexroth axial piston pump, original equipment manufacturer part for industrial hydraulic systems.
| Parameter Category | Parameter | Specification / Description |
|---|
| General Information | Manufacturer / Model | Rexroth (Germany), A4VSO Series |
| Complete Model | A4VSO500DFR/30L-PPB13N00 |
| Pump Type | Swashplate Axial Piston Pump, Open Circuit |
| Hydraulic Performance | Nominal Displacement | 500 cm³/rev |
| Nominal Pressure (Continuous) | 350 bar |
| Peak Pressure (Intermittent) | 400 bar |
| Recommended Speed | 750 - 1200 rpm (Max ~1500 rpm subject to inlet conditions) |
| Theoretical Flow @ 1200 rpm | ~600 L/min |
| Control Type | DFR — Load Sensing (LS) + Pressure Limiting (DR) with Internal Spring |
| Mechanical Interface | Shaft Type | Parallel Key Shaft (DIN 6885) |
| Rotation Direction | Counter-Clockwise (L) — viewed from shaft end |
| Mounting Flange | ISO 3019-2 (4-bolt, metric) |
| Port Configuration | PPB13: SAE flanged ports, metric screws, 13 series port plate |
| Through Drive | N00: No through-drive capability |
| Sealing & Media | Seal Material | NBR (Standard, code P implied) |
| Compatible Fluids | Mineral oils (HL/HLP), HFC (Water Glycol with derating) |
| Weight (approx.) | ~240 kg |
Frequently Asked Questions
Q1: What does "DFR" control mean and how is it different from DR, LR2, or EO1?
- DFR = Load Sensing + Pressure Limiter with internal spring setting the LS differential (∆p). Requires LS line from valve bank. Most common for standard LS systems.
- DR = Pressure compensator only (no LS) — pump goes to max displacement below set pressure, then de-strokes.
- LR2 = Same LS+DR principle but may offer different orifice/spring options; functionally close to DFR in many cases.
- EO1 = Electro-hydraulic pilot control — no internal LS spring, needs external pilot pressure.
DFR is the standard choice when you have a valve bank providing a Load Sense signal.
Q2: The rotation code is "L" (30L) — what does that mean practically?
"L" = Counter-Clockwise when viewed from the drive shaft end. This is the opposite of the more common "R" (Clockwise). The pump must be driven in this direction — running it in reverse will cause immediate failure due to loss of lubrication and improper suction. Always verify your prime mover / coupling rotates counter-clockwise from the shaft side.
Q3: What are the suction (inlet) requirements for this 500 cc pump?
With 500 cm³/rev displacement, inlet conditions are critical:
- At 1200 rpm, inlet absolute pressure should be ≥ 1.0-1.2 bar (boost pump strongly recommended for sustained high-speed operation).
- For speeds >1200 rpm, a dedicated charge pump / supercharge circuit is essential to prevent cavitation.
- Use generously sized inlet piping (≥ DN80/100), minimize elbows/restrictions, and fit a 149 µm (100 mesh) suction strainer.
Q4: Can I mount an auxiliary pump (gear pump) on the rear?
No. The suffix N00 indicates no through-drive shaft. The rear of the pump housing is blanked. If you need a through-drive for a charge / pilot gear pump, select a version with a through-drive code such as K01, K02, etc.
Q5: How should the case drain (L port) be handled?
Connect one case drain port directly to the tank with a dedicated line — zero backpressure (max 0.5 bar). The second drain port must be plugged. Route the drain line to above the tank oil level or provide a loop to prevent air ingestion. A blocked or pressurized drain = shaft seal failure.
