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Parker PGP505 Series Fixed Displacement External Gear Pump

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On 2026-10-24
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Product Description

The PGP505 belongs to Parker PGP500 aluminium gear pump family. It is a lightweight, high-power-density fixed-displacement external gear pump for mobile hydraulics. Its matching gear motor is PGM505. Different from PGP502/503 with 9-tooth gears, PGP505 adopts 13-tooth optimized gear profile, which brings lower flow ripple and quieter operation. It features three-piece aluminium housing, pressure-balanced thrust plates and journal bushings. Single, tandem and multi-section versions are available, widely used in medium-duty mobile hydraulic systems where compact size, light weight and low noise are required.

1. Overview

PGP505 is an external-meshing fixed displacement gear pump. The 13-tooth gear design effectively reduces pressure pulsation and running noise. Modular structure supports flexible selection of mounting flanges, shaft ends, port styles, seal materials and integrated valves. Standard rotation options include clockwise (CW) and counter-clockwise (CCW). It is a preferred high-performance aluminium gear pump for agricultural machinery, material handling and compact construction equipment.

2. Construction & Key Features

  1. Three-piece high-strength aluminium housing: Light weight, good heat dissipation and sufficient rigidity, suitable for mobile installations with weight and space constraints.
  2. Pressure-balanced thrust plates: Automatically compensates axial clearance, maintains high volumetric efficiency during the whole service life, reduces friction and wear.
  3. Journal bushing design: Lubricated by hydraulic fluid, stable bearing capacity for continuous operation. Axial thrust on the drive shaft is not permitted. Outboard bearing versions are optional for applications with heavy radial shaft loads.
  4. Precision ground 13-tooth gear set: Optimized tooth profile, low flow ripple, quiet operation, volumetric efficiency up to 96%.
  5. Modular design: Multiple choices of SAE flanges, rectangular through-bolt flanges, shaft ends and port forms. Tandem multi-pump assembly is supported, supplying independent hydraulic circuits from one driving source.
  6. Integrated valve options:
    • Relief valve with anti-cavitation check valve
    • Priority flow valve
    • Load-sensing unloading valve
    • Solenoid unloading relief valve, cross-port relief valve, etc.

3. Main Technical Specifications

  • Displacement range: 2 ~ 12 cm³/rev (codes: 0020, 0030, 0040, 0050, 0060, 0070, 0080, 0090, 0100, 0110, 0120)
  • Max continuous pressure:
    • 2–8 cm³/rev: 275 bar (3988 psi)
    • 9–11 cm³/rev: 250 bar (3625 psi)
    • 12 cm³/rev: 220 bar (3190 psi)
  • Max intermittent pressure: up to 300 bar (4351 psi)
  • Speed range: 500 ~ 4000 rpm; maximum speed decreases for larger displacement codes
  • Rotation: CW / CCW
  • Standard mounting: SAE A 2-bolt flange, rectangular through-bolt flange; custom flanges on request
  • Shaft options: keyed shaft, SAE splined shaft, tapered shaft
  • Port options: SAE split flange, SAE straight thread, BSPP, metric thread; side or rear port layout
  • Compatible fluid: Anti-wear mineral hydraulic oil. FPM fluorocarbon seals optional for water-glycol, emulsion and fire-resistant fluids; FPM seals are mandatory for phosphate ester fluids.
  • Recommended viscosity: 16 ~ 100 cSt
  • Suction requirement: Minimum absolute inlet pressure ≥0.8 bar to avoid cavitation
  • Approx. weight: 1.7 ~ 2.4 kg (varies with displacement and configuration)

4. Typical Applications

  • Compact construction machinery: mini excavators, small skid steer loaders, compact aerial work platforms
  • Agricultural & turf equipment: tractors, planters, harvesters, lawn care machines
  • Material handling: pallet trucks, forklift auxiliary hydraulics, tailgate lifting units
  • Mobile hydraulic power packs, forestry machinery, small sanitation vehicles

5. Ordering Code Explanation

Example model: PGP505B0060BP2D1NE2E2

  • PGP505: Series identifier (PGM505 = matching gear motor)
  • A: Single pump; B: Tandem / multi-section pump
  • 0060: Displacement code (6 cm³/rev)
  • C / E: Rotation (CCW / CW)
  • P2: Flange code
  • D1: Shaft type code
  • N: Seal material code
  • E2E2: Port configuration
  • Suffix codes: integrated valve, revision version

Note: Verify port layout, shaft diameter, rotation direction and built-in valves before pump replacement.

6. Operation Guidelines

  1. Direct drive by flexible coupling is recommended. Avoid excessive radial shaft loads; select outboard bearing version if significant radial force exists.
  2. Suction line must be sized adequately. Keep low inlet pressure drop to prevent cavitation damage to thrust plates and gear sets.
  3. Recommended filtration: 10 μm hydraulic filter. Regular oil change is required. Although tolerant to contamination, solid particles accelerate thrust plate wear.
  4. Built-in relief valve is only for system protection. It is NOT designed for continuous throttling or pressure regulation duty.
  5. For tandem pumps, each section has its independent pressure rating. Check displacement and pressure separately for every section during selection.

7. Differentiation from Related Series

  • PGP505: Aluminium housing, 13-tooth gear, displacement 2–12 cc/rev, low noise
  • PGP502 / PGP503: Aluminium housing, 9-tooth gear, smaller displacement range
  • PGP511 / PGP517: Larger frame size in PGP500 aluminium family, bigger displacement
  • PGP350 / PGP365: Cast iron heavy-duty pumps for higher flow and severe mobile working conditions
  • PGM505: Gear motor sharing identical housing, cannot be used as a pump.

 

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Older Parker PGP503 Series Fixed Displacement External Gear Pump