Carlyle Oil Pump with Cover for Carrier 5F20 5F30 5F40 5F60

Carrier / Carlyle Oil Pump with Cover for 5F20, 5F30, 5F40, and 5F60 Reciprocating Compressors

The Carrier / Carlyle positive-displacement lubricating oil pump assembly with integrated end cover is engineered for Carlyle 5F series open-drive reciprocating compressors (5F20, 5F30, 5F40, and 5F60). Operating directly off the compressor crankshaft drive flat or driving pin, this sub-assembly supplies forced-feed hydrodynamic lubrication across main journal bearings, connecting rod journals, wrist pins, and shaft seal faces.

Constructed with high-tensile close-grained cast iron housings and precision-machined internal gears, the pump includes an internal auto-reversing mechanism. This feature ensures continuous positive oil displacement and steady differential pressure regardless of clockwise (CW) or counter-clockwise (CCW) crankshaft rotation. The integrated end cover features high-pressure differential ports, an oil pressure regulating bypass cavity, and precision-faced gasket mating surfaces to prevent crankcase-to-atmosphere refrigerant leakage under heavy marine and industrial refrigeration loads.

Model Details

• Primary OEM Assembly MPN: 5F40-677 / 5F20-A272
• Bearing Head & Pump Housing Sub-Assembly: 5F60-677 / 5F40-A352
• Cover Gasket Reference: 6F25-1031 / 5F20-1113
• Carlyle Casting References: 5F20-272, 5F30-312, 5F40-672

Technical Details:

Compatible Compressor Models

• Carrier / Carlyle 5F20 Series: 5F20-S674, 5F20-A684, 5F20-S684, 5F20-A752, 5F20-172
• Carrier / Carlyle 5F30 Series: 5F30-A189, 5F30-S644, 5F30-A219, 5F30-S664, 5F30-172
• Carrier / Carlyle 5F40 Series: 5F40-A219, 5F40-S219, 5F40-4FI-A, 5F40-A352, 5F40-172
• Carrier / Carlyle 5F60 Series: 5F60-A219, 5F60-S219, 5F60-4FI-A, 5F60-A352, 5F60-172

Features

1. Bi-Directional Auto-Reversing Gear Geometry: Maintains positive oil flow and hydrodynamic wedge lubrication regardless of motor rotational phase or reversal during service.
2. Integrated Differential Pressure Regulating Valve: Incorporates a precision internal spring-and-piston bypass mechanism that stabilizes crankcase pressure differentials between 18 and 30 PSID.
3. High-Integrity Class 30 Cast Construction: Resists cyclical cavitation, pressure pulsation, and micro-cracking under demanding marine engine-room vibrations.
4. Machined Gauge & Safety Switch Ports: Standard 1/4″ NPT tapping allows direct connection to mechanical differential pressure switches (e.g., Danfoss MP55, Penn P28) and testing manifolds.
5. Direct Crankshaft Coupling: Features a hardened engagement slot engineered to mate with Carlyle 5F drive pins with minimal backlash, reducing start-up impact wear.

Industrial & Marine Applications

• Commercial Marine Provision Refrigeration: Cargo food storage, galley walk-in chillers, and deep-freeze provisions aboard container ships, bulk carriers, and tankers.
• Reefer Vessels & Cargo Hold Cooling: Direct-expansion and brine-chilling systems sustaining perishable marine cargo.
• Offshore Oil & Gas HVAC Modules: Explosion-proof HVAC and pressurization systems on floating production storage and offloading units (FPSOs) and fixed drilling platforms.
• Industrial Cold Storage & Process Chillers: Continuous-run cold stores, glycol chillers, and food/beverage processing systems using open-drive belt or direct-drive motor packages.

Frequently Asked Questions

How do I calculate net oil pressure on a Carrier Carlyle 5F compressor?

Net oil pressure is not the absolute value displayed on the pump discharge gauge. It is calculated by subtracting the crankcase suction pressure from the oil pump discharge pressure. For example, if suction pressure is 35 PSIG and the pump discharge gauge reads 60 PSIG, your net differential oil pressure is 25 PSID, which falls within the healthy operating window (18 to 30 PSID).

Does rotation direction matter when installing this Carlyle 5F oil pump assembly?

No. The pump incorporates an internal reversing mechanism that automatically directs suction and discharge flows to their designated galleries regardless of clockwise or counter-clockwise crankshaft rotation.

What causes a Carlyle 5F oil pump to lose differential pressure during operation?

Common root causes include:

• A fouled suction oil strainer screen inside the crankcase sump.
• Liquid refrigerant foaming in the oil crankcase during sudden load changes, causing vapor cavitation in the pump gears.
• Worn main journal bearings allowing lubricating oil to bypass back to the sump prematurely.
• A stuck or worn internal pressure relief valve spring.

Are the oil pump covers identical across 5F20, 5F30, 5F40, and 5F60 models?

Yes, the mechanical mounting geometry, bolt pattern, and pump rotor core dimensions are shared across the Carlyle 5F reciprocating platform (from 2-cylinder 5F20 models through 6-cylinder 5F60 models), allowing standardized inventory for fleet managers and facility engineers.

Which safety switch should be wired to the oil pump cover pressure tap?

The 1/4″ NPT high-pressure tapping connects directly to the high side of an approved differential oil pressure switch (such as Danfoss MP55 or Johnson Controls/Penn P28). The low side connects to the compressor crankcase. The switch must feature a 90 to 120-second time-delay relay to permit proper oil pressure buildup during motor startup.