PHM20.19R5 Casappa Gear Motor 19.09cc 250 Bar

Product Overview

The PHM20.19R5-55B2-LOC/OC-N-L-D-D is a Casappa Polaris PH Series external gear motor, not a gear pump. According to Casappa’s official technical catalogue, the PHM 20•19 has a geometric displacement of 19.09 cm³/rev (1.16 in³/rev) and belongs to the fixed-displacement PHM gear motor range. The Polaris PH platform uses a heavy-duty three-piece external gear design with cast-iron housing construction developed for applications where conventional aluminium gear units are approaching their performance limits.

The PH series combines high-pressure capability with modular shaft, flange, port and valve configurations. This is particularly valuable for OEM replacement and aftermarket service because dimensional and interface compatibility can be engineered by matching the complete configuration rather than displacement alone.

For this reason, the PHM20.19R5-55B2-LOC/OC-N-L-D-D should be positioned in search and product content as a Casappa PHM 20 external gear motor.

Technical Specifications

• Manufacturer: Casappa
• Series: Polaris PH
• Product Type: External gear motor
• Model: PHM 20•19
• Complete Configuration: PHM20.19R5-55B2-LOC/OC-N-L-D-D
• Displacement: 19.09 cm³/rev
• Displacement: 1.16 in³/rev
• Maximum Continuous Pressure: 250 bar / 3625 psi
• Maximum Intermittent Pressure: 280 bar / 4060 psi
• Maximum Peak Pressure: 300 bar / 4350 psi
• Maximum Speed: 3500 rpm
• Minimum Speed: 500 rpm
• Drive Principle: Fixed-displacement external gear motor
• Configuration Code R: Reversible configuration with rear drain arrangement
• Bearing Code 5: External-bearing option
• Shaft Code 55: German 1:5 tapered shaft
• Flange Code B2: German mounting flange
• Port Position Code L: Side ports
• Seal Code N: Standard NBR sealing
• Rear Cover Code L: Cast-iron mounting flange with aluminium rear cover
• Shaft Seal Code D: Standard shaft seal with dust lip
• Hydraulic Fluid: ISO/DIN-compliant mineral-oil-based hydraulic fluid
• Recommended Viscosity: 12–100 mm²/s
• Maximum Permitted Viscosity: Up to 750 mm²/s depending on operating conditions
• Standard Fluid Temperature: Approximately -25°C to +80°C for standard NBR configuration
• Inlet Pressure: 0.7–3 bar absolute, subject to shaft-seal limitations
• Cold Start Speed Limit: Up to 1500 rpm until oil temperature and viscosity become suitable
• Weight: Exact complete-configuration weight was not independently verified in the reviewed official catalogue and is therefore not stated.

Key Technical Advantages

Heavy-Duty Cast-Iron Construction

The Polaris PH platform uses a cast-iron housing architecture designed to provide higher structural strength than conventional aluminium gear units in demanding mobile and industrial applications. Casappa also notes that the cast-iron end-cover and housing combination contributes to lower noise and increased product strength.

High-Pressure 19.09 cc/rev Configuration

With 19.09 cm³/rev displacement, the PHM20.19 provides a relatively high torque-producing displacement within the PH 20 frame. The PH 20 family is rated up to 250 bar continuous, 280 bar intermittent and 300 bar peak pressure.

These values must be interpreted correctly: the 300 bar specification is a peak-pressure limit, not a continuous operating rating.

Modular Interfaces for Replacement Engineering

Casappa offers multiple shaft, mounting flange, port-position and hydraulic-port configurations within the PH platform. For the submitted configuration, the official ordering system identifies 55 as the German 1:5 tapered shaft, B2 as the German mounting flange, and L as the side-port position.

This modularity makes the PHM platform suitable for OEM replacement, retrofit and aftermarket interchange projects, provided all mechanical and hydraulic interfaces are verified.

Flexible Sealing Options

The PH series supports NBR, FKM and HNBR/FKM sealing configurations, together with standard and high-back-pressure shaft-seal options. The supplied configuration uses NBR sealing and the standard dust-lip shaft seal.

Stable Performance in Thermally Demanding Systems

Casappa identifies high volumetric efficiency retention at elevated temperatures as one of the design characteristics of the Polaris PH series. Actual performance will depend on operating pressure, speed, fluid viscosity and temperature.

Application Areas

Typical PH series applications listed by Casappa include:

• Forklifts
• Construction machinery
• Material handling equipment
• Agricultural machinery
• Forestry equipment
• Lawn and mowing equipment
• Hydraulic fan-drive systems

The PHM20.19 can also be considered for aftermarket replacement and hydraulic system refurbishment, provided the shaft, flange, port arrangement, rotation, drainage and operating limits are fully matched to the target machine.

Expert Maintenance Tips

Verify Shaft Alignment

Casappa recommends checking alignment between the mounting flange, drive shaft and motor shaft. A flexible coupling should be used to avoid transferring unwanted axial or radial loads into the motor shaft.

Prime and Start at Low Speed

Before startup, the hydraulic circuit should be clean and filled with filtered oil. Start at the lowest practical speed and pressure, allow the motor and hydraulic oil to warm progressively, and increase speed and pressure gradually toward the required operating point.

Control Hydraulic Contamination

High-pressure gear units are highly dependent on clean hydraulic fluid. Casappa specifies progressively stricter cleanliness requirements as operating pressure increases, including ISO 4406 targets such as 20/18/15 and 19/17/14 depending on the pressure range.

Protect the Shaft-Seal Area

Keep the shaft-seal area clean and free from abrasive contamination. Casappa specifically warns that abrasive particles can accelerate shaft-seal wear and increase leakage. Filter maintenance and hydraulic-oil condition should be checked according to the actual operating environment.

Treat Peak Pressure as a Transient Limit

The 300 bar peak-pressure rating should not be used as a normal continuous operating target. Casappa defines peak pressure in relation to transient events such as relief-valve overshoot and recommends controlling pressure spikes so they remain within the published limits.

Verify the Complete Configuration Before Replacement

The submitted model string contains OC/OC. Casappa’s official ODT port-ordering section uses different port combinations for PHM 20 models in the 14–20 cm³/rev range, so the exact port configuration should be checked against the motor nameplate, original purchase specification or manufacturer configuration record before final procurement.

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