52111BV1 - Tronair 5210/5211 Hydraulic Power Unit (HPU)

The Tronair 5210/5211 Hydraulic Power Unit (HPU) is used to supply controlled hydraulic flow and pressure for ground maintenance and troubleshooting. It allows technicians to pressurize aircraft hydraulic systems for functional checks, leak testing, component replacement, and system servicing. This supports safer maintenance by delivering consistent hydraulic power, eliminating the need for aircraft engines or onboard pumps.

The 52-series HPU platform can be configured for multiple aviation hydraulic fluid types, depending on the specific configuration of the unit. Fluid selections include MIL-PRF-5606, MIL-PRF-83282, phosphate ester fluids (Skydrol), MIL-PRF-87257, and phosphate ester (HyJet V). Matching the HPU fluid configuration to the aircraft’s hydraulic system is critical for preventing seal damage, contamination, or compatibility issues.

Aircraft hydraulic systems are designed to operate with specific fluids, and using the wrong fluid type can lead to significant maintenance problems. Incorrect fluid selection may degrade seals, create leaks, reduce performance, or contaminate sensitive hydraulic components. Tronair’s ordering guidance emphasizes confirming the fluid type before specifying the HPU configuration. Taking this step up front helps avoid costly rework and prevents downtime during hydraulic servicing.

To select the correct hydraulic couplers, first confirm the coupler style used on your aircraft’s hydraulic service points, as bulkhead fittings and connector types can vary significantly by aircraft model and configuration. Matching the correct quick-disconnect coupling kit ensures your HPU hoses connect securely and seal properly during servicing. This helps minimize connection issues, reduce hydraulic fluid leakage, and support cleaner, safer maintenance. If you’re unsure which couplers your aircraft requires, our aviation specialists can help you confirm compatibility based on your aircraft information and maintenance needs.

Hydraulic coupling hose adapter kits include couplings and dust plugs that adapt HPU hoses to aircraft bulkhead couplings. These kits are important because even a high-performing hydraulic power unit can’t be used efficiently without the correct connection hardware. Using the proper kit improves speed and reliability during maintenance by eliminating the need for improvised fittings or incorrect hookups. It also supports cleaner hydraulic servicing by helping prevent contamination at the connection point.

To determine the correct input voltage for the HPU, measure the phase-to-phase voltage at your power source (L1 to L2, L1 to L3, and L2 to L3). Use the highest reading to identify the correct input voltage for the unit. Confirming voltage in advance helps ensure the HPU runs safely, starts correctly, and avoids electrical performance issues in the hangar or shop environment.

Standard features for the Tronair 5210/5211 Series HPU include:

• 15' Hoses
• Single System
• Return Filter
• 30-Gallon Reservoir

Available options for the Tronair 5210/5211 Series HPU include:

• 25' Hoses (Option A/AA)
• 50' Hoses (Option B/BB)
• Split System (Option C)
• Split System with Crossover Check (Option D)
• Hourmeter (Option E/F – 50 and 60 Hz)
• Voltage Monitor (Option G-J – Voltage-Dependent)
• Pyrometer (Option K)
• Electrical Reservoir Level (Option L)
• Hand Pump (Option M)
• Towing/Trailer Package (Option N)
• Reservoir Return (Option P)
• Calibration Port (Option Q)
• Electrical Filter Clogged Indicator (Option R)
• Electric Over-Temperature (Option S)
• Return Back-Pressure with Sight Gauge (Option T – Skydrol Only)
• Return Sight Gauge (Option U/Y)
• Return Back-Pressure (Option V/1)
• Return Filter (Option W)
• 50' Hand Pump (Option X)
• Drip Pan (Option 4)
• Hand Pump (Large Displacement) (Option 7)
• Pressure-Reducing Valve (Split System) (Option 8)
• 100' Input Cable

A split system (also known as a dual system) configuration features a second set of pressure and return hoses, each equipped with shutoff valves. This allows technicians to support aircraft that require dual hydraulic system servicing and controlled testing procedures. For certain platforms, a dual setup can reduce the need to disconnect and reconnect between circuits, helping shorten maintenance time. It also supports more precise system isolation during troubleshooting.

A voltage monitor helps protect the HPU when operating in hangars where power conditions may vary. Tronair’s voltage monitor option is designed to shut the unit down in cases such as incorrect input voltage, phase loss, incorrect phase sequence, low voltage, high voltage, or unbalanced voltage. This protection can help prevent damage to electrical components and reduce the risk of improper startup. It’s especially valuable for facilities that frequently connect to different power sources.

A pyrometer adds a temperature gauge used to monitor return oil temperature during operation. This helps technicians track heat buildup during extended hydraulic testing or higher-demand servicing. Monitoring temperature can help prevent overheating conditions that may impact hydraulic fluid performance or trigger system shutdowns. It also supports smarter maintenance decisions during long functional checks.

A return sight glass is used to help monitor for air in the return line fluid during operation. This can be useful for troubleshooting aeration concerns, identifying return flow irregularities, or confirming stable hydraulic return conditions. In active maintenance environments, visual confirmation can help technicians identify issues early, before they escalate into larger system problems. It’s a simple feature that can improve confidence during hydraulic system testing.

The electronic reservoir sensor is designed to shut the hydraulic unit down if the reservoir fluid level is too high or too low, and includes panel warning lights. This helps protect the HPU from operating under unsafe fluid conditions that could cause pump damage, overheating, or erratic output. It also enhances day-to-day operational safety by making reservoir level issues easier to identify and address promptly. For busy maintenance teams, this kind of protection can reduce preventable servicing interruptions.

A calibration port allows technicians to attach a test gauge and calibrate the unit’s pressure gauge to the rated capacity of the hydraulic power unit. This supports accuracy during hydraulic servicing and helps ensure pressure settings are reliable during aircraft testing. Calibrated instrumentation is particularly important when troubleshooting performance issues or verifying the proper system pressure response. Adding this option can help improve confidence and consistency across maintenance tasks.