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EO1 is an electro-hydraulic (pilot-pressure dependent) control. Unlike LR/DFR which have internal springs setting the LS differential, EO1 requires an external pilot pressure (X port) to command the swashplate angle. Typically used with a remote proportional valve or electronic controller to set pump displacement/pressure demand. No external pilot = pump goes to minimum displacement (or zero depending on spring bias — usually near-zero for EO).
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.
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
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.
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.
Including mechanical losses (~90%), input power ≈ 390 kW
Recommend a 400 kW (≈535 HP) prime mover with adequate starting torque reserve for 400 bar peak conditions.
Is the standard NBR seal okay for water glycol (HFC) or phosphate ester (HFD)?
Standard NBR is compatible with HFC (water glycol) with pressure/temp derating. It is NOT compatible with HFD (phosphate ester) — for HFD you need FKM (Viton) seals, typically a custom order with /V suffix. Confirm with Rexroth if your fluid is not mineral oil (HL/HLP).
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter
Total Annual:
1 million-10 millon
Employee Number:
>50
Ecer Certification：
Verified Supplier
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha... Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha...
