Malabar PF55451-23 – Model 470 – 15-Gallon Oil Service Unit – Petroleum-Based Fluids

The Malabar PF55451-23 Model 470 is a 15-gallon fluid dispenser designed to service various commercial aircraft with petroleum-based fluids. It is commonly used for aircraft engine oil servicing and similar replenishment tasks. The unit provides controlled manual dispensing to support clean, efficient, and reliable maintenance operations.

The unit is designed for petroleum-based fluids, making it suitable for turbine oil and other approved aviation lubricants. Operators must always follow aircraft manufacturer specifications when selecting service fluids. Using only approved fluids helps maintain system integrity and compliance with maintenance standards.

The unit features a 15-gallon (56.8-liter) reservoir, providing sufficient capacity for routine aircraft oil servicing without frequent refilling. This size supports both hangar and ramp operations. The larger capacity improves efficiency during scheduled maintenance tasks.

The Model 470 uses a manual hand pump assembly that delivers approximately 4 cubic inches (65.5 cc) of fluid per stroke. The system includes a built-in relief valve to protect against overpressurization. Full, steady pump strokes ensure consistent flow during aircraft servicing.

The relief valve is factory set to 150 ± 10 PSIG (1034 ± 69 kPa). This setting protects both the oil service unit and the aircraft system from excessive pressure during operation. Adjustment is recommended only if absolutely necessary and must follow the manufacturer's procedures.

The PF55451-23 includes a filter housing with a 3-micron nominal filter element to help remove contaminants before fluid reaches the aircraft system. Proper filtration helps prevent FOD and protects sensitive engine components. Regular filter replacement is essential to maintain optimal flow and cleanliness.

The unit includes a 120” (304.8 cm) fluid delivery hose, allowing technicians flexibility when positioning the cart near the aircraft. The hose connects directly to the aircraft service point and should be capped with the dust plug kit after use. Proper hose handling reduces contamination and fluid loss.

Routine maintenance includes inspecting and replacing the filter element every 3 to 4 months, or sooner if increased pumping resistance is observed. Wheel bearings should be lubricated as needed. Pump assembly components, such as O-rings, scrapers, and seals, should be inspected and replaced during overhaul to maintain performance.

If the pump loses pressure or output, technicians should first check the fluid level and inspect for clogged filters, worn O-rings, or debris in the valve assembly. The relief valve setting may also require verification. Following the troubleshooting procedures in the service manual helps restore proper function safely.

Malabar equipment, including the PF55451-23 oil service unit, carries a one-year warranty from the date of shipment (excluding tripod jacks, which have different coverage). Replacement parts, repair kits, and technical support are available directly through Tronair/Malabar International. Proper use and adherence to OEM guidelines are required to maintain warranty coverage.