Parker PGP511 334-9111-364 Hydraulic Gear Pump

Parker PGP511 Hydraulic Gear Pump | P/N 334-9111-364 (PGP511M0270CS2D3NL2L1B1B1)

The Parker Hannifin 334-9111-364 (Model Code: PGP511M0270CS2D3NL2L1B1B1) is a heavy-duty, fixed-displacement external gear pump engineered for severe-duty marine, mobile, and industrial hydraulic systems. As part of Parker’s proven PGP500/PGM500 series (Group 2 architecture), this unit integrates high-tensile, extruded aluminum bodies with cast iron front and rear covers to achieve high power-to-weight density, pressure containment, and torsional stiffness.

The pump delivers high volumetric efficiency (typically >93%) while minimizing hydraulic cavitation noise and fluid-borne vibration. This specific configuration is set to a theoretical displacement of 27.0 cm³/rev (1.65 in³/rev), right-hand (clockwise) shaft rotation, a precision European/Italian 1:8 tapered keyed drive shaft, standard European rectangular 4-bolt pilot mounting, and European diamond-pattern 4-bolt flanged fluid ports.

Technical Details

Key Features

1. Advanced 12-Tooth Fluid Flow Profiling: Engineered low-pulsation, low-noise gear tooth profile significantly dampens hydraulic pressure ripples, protecting downstream steering valves and deck instrumentation from high-frequency fatigue.
2. Dynamic Bushing Pressure Balancing: Dual floating hydrostatic thrust plates automatically equalize running clearances across temperature swings and duty-cycle pressure spikes to sustain volumetric efficiencies exceeding 93%.
3. High-Grade Extruded Aluminum Construction: Aircraft-grade aluminum housing paired with cast iron end plates yields fatigue resistance up to 210 bar (3,045 psi) intermittent while reducing overall unit mass for shipboard and compact machinery skids.
4. Standard European Interchangeability: Compliant with DIN/ISO Group 2 standards, featuring a D3 rectangular pilot and S2 1:8 taper shaft for drop-in coupling with European auxiliary drive PTOs and IEC bellhousings.
5. Robust Seal Chamber Containment: Integrated NBR shaft lip seal accompanied by internal pressure-relief drain passages withstands back-pressure spikes up to 4 bar on the shaft seal cavity.

OEM & Machine Cross-Compatibility

• Direct dimensional replacement for Group 2 European pumps installed on Rolls-Royce / Kongsberg Marine steering actuators, MacGregor hatch cover hydraulic units, and Caterpillar / MaK auxiliary PTOs.
• Compatible with standard European drive bells matching 71.4 x 96.0 mm bolt patterns (Group 2 standard) and 1:8 tapered hub lockings.

Frequently Asked Questions

Can this pump be driven in reverse (counter-clockwise)?

No. The Parker 334-9111-364 is a single-direction, clockwise (CW) rotation pump. Reversing the rotational direction will lead to severe internal overpressurization of the suction cavity and dynamic seal rupture. If counter-clockwise operation is needed, select the corresponding “A” code variant (PGP511A0270…).

What is the difference between Parker PGP511 and PGM511?

“PGP” designates a pump unit engineered to convert mechanical shaft torque into fluid hydraulic energy. “PGM” designates a motor configured with bi-directional valving, internal check valves, and dedicated external drain passages to convert hydraulic fluid power into mechanical shaft rotation.

Which hydraulic fluid is recommended for this pump in marine environments?

Premium anti-wear hydraulic oils (HM or HV classification) meeting ISO 11158 or DIN 51524 Part 2/3 (such as Shell Tellus S2 V, Mobil DTE 10 Excel, or Castrol Hyspin AWH-M) are recommended. Viscosity should stay between 12 and 100 mm²/s during sustained continuous operation.

How do I identify if my worn pump has the same mounting dimensions?

Measure the rectangular front pilot: the D3 flange features a 71.4 mm x 96.0 mm rectangular bolt spacing with a Ø36.47 mm centering spigot, and the S2 shaft features an Italian standard 1:8 taper secured via an M12x1.5 castle or lock nut. Check that your fluid connections use 4-bolt diamond flange fittings (L2 inlet, L1 outlet).