Parker PGP330 PGM350 Cast Iron Gear Pump Motor | 3249111030 3239219053 Replacement

The PGP and PGM Series heavy-duty cast iron gear pumps and motors from Chengyuan Hydraulic are premium fluid power components fully compatible with Parker Commercial Intertech standards. Featuring a rugged three-piece ductile iron housing, this series is engineered to withstand severe high-pressure impulses in excavators, cranes, and mining machinery. For specific core configurations like pump PGP330A197FJAB12-98 (P/N 3249111030) and motor PGM350A1978VYEB22-11 (P/N 3239219053), we utilize specialized surface-hardening on the internal heavy-duty journal bearings and floating thrust plates. Every unit undergoes 100% simulated full-load and housing leakage testing before shipment to guarantee volumetric efficiency parity with the OEM, ensuring 100% original-place interchangeability.

Technical Specifications :

• Model & Part Number: PGP330 (Pump P/N: 3249111030) / PGM350 (Motor P/N: 3239219053)

• Displacement Codes (A197/197): 330 Series: approx. 39.4 $cm^3/rev$; 350 Series: approx. 64.3 $cm^3/rev$

• Nominal Operating Pressure: Up to 241 bar (24.1 MPa) for both PGP330 and PGM350

• Intermittent Peak Pressure: 275 bar (27.5 MPa)

• Speed Range: 600 – 2400 rpm

• Housing Construction: Heavy-duty, high-grade three-piece cast iron construction

• Shaft & Flange Options (FJ/8V): Standard SAE splined shaft (e.g., 13T or 14T) with standard SAE 2-bolt or 4-bolt mounting flanges

• Port Configurations (AB/YE): SAE split-flange ports or high-pressure straight thread ports

• Sealing Elements: Premium FKM (Viton) shaft seals standard, rated for $-40°C$ to $+120°C$

Key Technical Advantages:

• Rugged Three-Piece Cast Iron Build: Unlike standard aluminum gear pumps, the front cover, gear housing, and rear cover of the PGP/PGM series are cast from premium-grade iron. This eliminates the risk of housing distortion under severe, frequent pressure spikes, drastically reducing component fatigue.

• High-Torque Integral Alloy Gears: The gears and shafts are one-piece forged, precision-machined, and vacuum-hardened to achieve high surface integrity. The optimized tooth profile minimizes fluid trapping, sustaining volumetric efficiency over 93% while dampening operational whine.

• Heavy-Duty High-Strength Journal Bearings: Equipped with proprietary alloy journal bushings layered with a self-lubricating composite. This setup absorbs significant radial imbalances exerted on the drive shaft, preventing the gears from scoring the internal chamber walls.

• Hydrostatic Radial & Axial Balance: Floating thrust plates incorporate automatic pressure-balanced clearance compensation. This technology eliminates internal slippage caused by oil thinning in hot summer environments, ensuring steady all-weather flow and torque output.

Application Areas:

• Dump Trucks & Refuse Compactors: Primary hydraulic pump for heavy-duty tipping and packing cycles.

• Heavy Lifting Cranes: High-torque winch drives or auxiliary hoist system motors.

• Drilling & Mining Gear: Auxiliary circuits for excavators and rotary head drives for underground drill rigs.

• Metallurgical Equipment: Primary power supply for high-pressure compact industrial HPU blocks.

Expert Maintenance Tips:

• Mandatory Separate Motor Drain: For motor models like the PGM350, if system return line backpressure is high, you must plumb the case drain line directly back to the reservoir. Never tie it into the main return line, as high case pressure will flip the shaft seal lip and cause external oil leaks.

• Zero Hammering on Drive Shaft: When fitting pulleys, gears, or flexible couplings onto the drive shaft extension, never strike it with a heavy mallet. Axial impact will dislodge the internal floating thrust plates, causing immediate seizure upon startup.

• Fluid Cleanliness Threshold: Cast iron pumps are highly vulnerable to hard particulate contaminants. We recommend a $10 \mu m$ absolute return filter equipped with a magnetic core to maintain oil cleanliness at ISO 19/17/14 or better.