Bendix Tu-Flo 550 Air Compressor

Quick Facts

Manufacturer: Bendix Commercial Vehicle Systems
Product Series: Tu-Flo
Model: Tu-Flo 550
Product Type: Engine-driven reciprocating air compressor
Brake-System Category: Air supply and air management
Compressor Design: Two-cylinder, single-stage reciprocating compressor
Cooling: Engine coolant
Lubrication: Engine lubrication system
Typical Mounting: Engine-mounted and gear-driven
Primary Function: Produces compressed air for the vehicle’s air-brake system and approved pneumatic accessories
Common Applications: Medium-duty and heavy-duty trucks, tractors, buses, and specialty commercial vehicles
Production Status: Commonly encountered as original equipment, service replacement, or remanufactured equipment; exact availability depends on part number and application
Primary Benefit: Proven compressed-air production for commercial-vehicle braking systems

Overview

The Bendix Tu-Flo 550 is an engine-driven air compressor used to supply compressed air for commercial-vehicle air-brake systems. It is part of the established Bendix Tu-Flo compressor family and has been installed across numerous medium-duty and heavy-duty trucks, tractors, buses, and specialty vehicles.

The compressor draws filtered air into its cylinders, compresses it, and sends the pressurized air through the discharge line to the vehicle’s air dryer and reservoir system. Stored air is then available for service brakes, spring-brake release, and approved pneumatic accessories.

The Tu-Flo 550 is a two-cylinder, single-stage reciprocating compressor. It commonly receives lubrication and coolant from the engine and is mechanically driven by the engine’s gear train.

Numerous application-specific Tu-Flo 550 configurations have been produced. Mounting flange, drive gear, cylinder-head orientation, air inlet, discharge port, coolant ports, oil connections, governor controls, and identification numbers must be verified before ordering a replacement.

Key Characteristics

Two-cylinder reciprocating compressor
Single-stage air compression
Engine-driven operation
Engine-supplied lubrication
Engine-coolant circulation
Designed for commercial air-brake systems
Supplies compressed air to the air dryer and reservoirs
Works with an air-compressor governor
Loaded and unloaded operating modes
Available in application-specific configurations
Established heavy-duty service history
Original, service-remanufactured, and replacement options may be available
Compatible with multiple medium-duty and heavy-duty vehicle applications when correctly specified

Major Components

Compressor crankcase
Cylinder block
Cylinder head
Compressor pistons
Piston rings
Connecting rods
Crankshaft
Crankshaft bearings
Inlet valves
Discharge valves
Unloader pistons
Unloader mechanism
Air inlet
Discharge port
Coolant inlet and outlet ports
Lubricating-oil passages
Drive gear or coupling
Mounting flange
Rear cover
Governor-control connection
Gaskets and seals
Safety and pressure-control components within the complete air system

How the Brake Component or System Works

The vehicle’s engine mechanically drives the compressor crankshaft. As the crankshaft rotates, connecting rods move the compressor pistons up and down inside the cylinders.

During the intake stroke, a piston moves downward and creates low pressure inside the cylinder. The inlet valve opens, allowing filtered air to enter.

During the compression stroke, the piston moves upward. The inlet valve closes, and the trapped air is compressed.

When cylinder pressure becomes high enough, the discharge valve opens. Compressed air leaves the cylinder head through the discharge port and enters the compressor discharge line.

The discharge line carries the hot compressed air toward the air dryer. The dryer removes moisture, oil aerosols, and contamination before the air enters the vehicle reservoirs.

The compressor does not operate at full delivery continuously. A governor monitors system pressure and controls the compressor’s loading and unloading cycle.

When reservoir pressure falls to the governor’s cut-in setting, the compressor returns to its loaded or pumping mode. When pressure reaches the cut-out setting, the governor sends control air to the compressor’s unloader mechanism.

The unloaders hold the inlet valves open so the compressor stops delivering compressed air to the reservoirs even though its internal components continue moving with the engine.

Position and Function Within the Brake System

The Tu-Flo 550 is part of the air-supply section of a commercial air-brake system.

The normal air-flow sequence is:

Engine-driven compressor
Compressor discharge line
Air dryer
Supply or wet reservoir
Primary and secondary reservoirs
Air-brake control valves
Brake chambers and actuators
Foundation brakes

The compressor creates the air supply used throughout the system. It does not directly apply the wheel brakes.

Compressed air produced by the Tu-Flo 550 may support:

Service-brake applications
Spring-brake release
Parking-brake control
Trailer air supply
Air suspension
Transmission controls
Air-operated accessories
Horn systems
Seat controls
Other approved pneumatic equipment

Accessory demand must be considered when determining whether the compressor and air system are appropriate for a vehicle.

Common Specifications

Compressor Type: Two-cylinder reciprocating air compressor
Compression Stages: Single stage
Nominal Displacement: Application and operating-speed dependent; commonly associated with approximately 13 cubic feet per minute in published Tu-Flo 550 service information
Drive Type: Engine-driven
Lubrication: Pressure lubrication supplied by the engine
Cooling: Engine coolant
Air Inlet: Naturally aspirated or connected to the engine air-intake system, depending on application
Pressure Control: External governor operating the compressor unloader system
Discharge Connection: Application-specific
Mounting Arrangement: Application-specific flange and engine installation
Drive Gear: Engine- and application-specific
Rotation: Determined by the approved engine installation
Operating Speed: Determined by engine gearing and application
Replacement Type: New, service replacement, or remanufactured, depending on part number and availability

Exact specifications must be confirmed using the complete Bendix part number, vehicle identification number, engine information, and compressor identification markings.

Operating Specifications and Performance

The Tu-Flo 550’s air-delivery performance depends on compressor speed, inlet restriction, discharge pressure, engine condition, temperature, duty cycle, and the condition of the compressor.

A properly operating compressor must build and maintain enough air pressure to support the vehicle’s braking system and approved pneumatic accessories.

Performance can be affected by:

Compressor rotational speed
Engine idle speed
Drive ratio
Governor cut-in and cut-out settings
Air-inlet restriction
Discharge-line restriction
Air-dryer condition
Reservoir capacity
Air-system leakage
Accessory air consumption
Compressor wear
Piston-ring condition
Valve condition
Cooling-system performance
Lubrication quality
Ambient temperature
Vehicle duty cycle

A compressor should be evaluated as part of the complete charging system. Slow pressure buildup does not automatically prove that the compressor has failed.

Braking Performance and System Integration

The Tu-Flo 550 does not create friction at the wheels, but its performance directly affects the air pressure available to the braking system.

Insufficient air production may cause:

Slow pressure buildup
Frequent low-air warnings
Delayed spring-brake release
Reduced air reserve
Frequent compressor operation
Difficulty supporting trailer air demand
Inability to operate approved pneumatic accessories normally
Extended recovery time after repeated brake applications

A properly maintained compressor supports reliable operation of:

Primary service-brake circuit
Secondary service-brake circuit
Spring brakes
Trailer brakes
Antilock braking systems
Electronic stability-control systems
Air disc brakes
Drum brakes
Air-operated auxiliary systems

Brake performance still depends on reservoirs, valves, chambers, foundation brakes, tires, vehicle loading, and driver operation.

Air Supply, Controls, and Electronic Integration

The Tu-Flo 550 works with a mechanical or air-controlled governor that monitors reservoir pressure.

The governor normally provides two basic operating commands:

Cut-in command when pressure falls

Cut-out command when pressure reaches the upper operating range

During cut-in, the compressor is loaded and supplies air.

During cut-out, governor pressure operates the unloader mechanism and stops normal air delivery.

The compressor may be integrated with:

Air dryer
Air-dryer purge reservoir
Supply reservoir
Primary reservoir
Secondary reservoir
Pressure-protection valves
Low-air warning devices
Pressure gauges
Electronic pressure sensors
Engine electronic controls
Vehicle diagnostic systems
Air-system monitoring equipment

The Tu-Flo 550 itself is primarily mechanical and pneumatic, but the complete vehicle may use electronic sensors and controllers to monitor air pressure, compressor operation, or system faults.

Installation, Adjustment, and Brake Balance

Correct compressor installation is necessary for reliable air-system operation.

Important installation considerations include:

Correct compressor part number
Approved engine application
Mounting-flange compatibility
Drive-gear compatibility
Gear backlash
Correct rotation
Proper mounting-fastener torque
Oil-supply connection
Oil-drain alignment
Coolant-line routing
Air-inlet routing
Discharge-line routing
Governor-control connection
Clearance from exhaust components
Clearance from moving engine components
Correct gasket and seal installation
Freedom from air, coolant, and oil leaks

The compressor does not directly determine left-to-right or axle-to-axle brake balance. However, inadequate system pressure can affect the operation of every brake circuit.

Compressor replacement should be followed by confirmation of normal pressure buildup, governor operation, air-dryer purging, system leakage, low-air warnings, and brake operation.

Foundation Brake, Axle, and Wheel-End Compatibility

The Tu-Flo 550 can support commercial vehicles equipped with different foundation-brake and axle configurations when the complete air system is properly designed.

Possible applications include:

S-cam drum brakes
Air disc brakes
Single rear axles
Tandem drive axles
Multiple drive axles
Steer-axle brakes
Lift axles
Pusher axles
Tag axles
Trailer air brakes
Bus brake systems
Specialty-vehicle brake systems

The compressor is not selected solely according to whether the vehicle uses drum or air disc brakes.

Compatibility also depends on:

Number of axles
Number and size of brake chambers
Trailer operation
Reservoir capacity
Accessory air demand
Vehicle duty cycle
Engine configuration
Compressor drive ratio
Required air-system recovery rate
Applicable vehicle requirements

Common Applications

Class 6 commercial trucks
Class 7 commercial trucks
Class 8 highway tractors
Regional-haul tractors
Vocational trucks
Dump trucks
Concrete mixers
Refuse trucks
Utility trucks
Municipal vehicles
Buses
School buses
Transit buses
Fire apparatus
Emergency vehicles
Recovery vehicles
Construction trucks
Specialty commercial vehicles

The Tu-Flo 550 has been produced in numerous configurations, so installation on a vehicle family does not confirm that every model or production year uses the same compressor.

Vehicle and Brake-System Compatibility

The correct Tu-Flo 550 configuration must match the vehicle’s engine and complete air system.

Compatibility depends on:

Vehicle manufacturer
Vehicle model
Model year
Vehicle identification number
Engine manufacturer
Engine model
Engine serial number
Compressor mounting flange
Drive gear
Gear position
Compressor rotation
Cylinder-head orientation
Air-inlet arrangement
Discharge-port location
Governor configuration
Oil-supply arrangement
Oil-drain arrangement
Coolant-port location
Air-dryer configuration
Reservoir capacity
Brake-system demand
Accessory air demand

A compressor should not be ordered only by the Tu-Flo 550 family name. Two Tu-Flo 550 compressors can look similar but use different mounting, gearing, ports, heads, or internal configurations.

Advantages

Established commercial-vehicle compressor design
Two-cylinder air delivery
Engine-driven operation
Engine-supplied lubrication
Engine-coolant circulation
Supports medium-duty and heavy-duty air-brake systems
Works with Bendix air dryers and governors when properly specified
Broad historical application base
Service knowledge is widely available
New or remanufactured replacements may be available
Rebuild and service components may be available for specific configurations
Can support truck, tractor, bus, and specialty-vehicle applications
Provides air for braking and approved pneumatic accessories

Limitations or Considerations

Application-specific mounting and gearing
Multiple Tu-Flo 550 configurations exist
Part numbers may not be interchangeable
Requires proper engine lubrication
Requires proper coolant flow
Discharge air becomes extremely hot
Oil carryover can contaminate the air system
Carbon can accumulate in the discharge line
Air leaks can cause excessive compressor duty cycle
High accessory demand can shorten compressor life
Improper governor operation can affect loading and unloading
Cooling-system problems can cause overheating
Some configurations may be older or superseded
Remanufactured units must match the original application
Compressor replacement does not correct leaks or restrictions elsewhere in the air system

Driver and Operator Experience

A correctly operating Tu-Flo 550 should build air pressure within the vehicle manufacturer’s specified time and maintain pressure during normal operation.

Drivers should monitor:

Primary air-pressure gauge
Secondary air-pressure gauge
Low-air warning light
Low-air warning buzzer
Air-pressure buildup time
Governor cut-in
Governor cut-out
Frequency of compressor cycling
Air-dryer purge operation
Parking-brake release
Trailer air-supply operation
Visible or audible air leaks
Warning messages

A compressor that runs frequently may be responding to an air leak or high pneumatic demand rather than an internal compressor failure.

Drivers should report slow pressure buildup, repeated low-air warnings, abnormal air-dryer purging, excessive compressor cycling, burning odors, coolant loss, oil leakage, or unusual engine-area noises.

Maintenance and Ownership Notes

Inspect the compressor for oil, coolant, and air leakage.
Check compressor mounting fasteners.
Inspect the drive gear and related engine components when accessible.
Verify engine oil level and condition.
Maintain the engine lubrication system.
Maintain the engine cooling system.
Inspect coolant hoses and fittings.
Check air-inlet plumbing.
Inspect the air filter or engine-intake connection.
Check the compressor discharge line.
Inspect for carbon buildup or restriction.
Maintain the air dryer.
Replace the air-dryer cartridge as required.
Drain and inspect air reservoirs.
Monitor reservoir contamination.
Check governor operation.
Measure system pressure buildup.
Perform air-leakage tests.
Inspect air lines and fittings.
Monitor compressor duty cycle.
Investigate excessive oil carryover.
Follow the approved Bendix and engine-manufacturer service procedures.
Replacement intervals and maintenance requirements depend on the compressor configuration, vehicle duty cycle, air consumption, engine installation, climate, and operating environment.

Common Brake-System Problems

Slow pressure buildup: Air-system leaks, a restricted inlet, restricted discharge line, worn compressor components, improper engine speed, governor problems, or air-dryer restrictions may be responsible.
Compressor will not load: A failed governor, blocked control line, stuck unloader mechanism, incorrect plumbing, or internal damage may prevent normal air delivery.
Compressor will not unload: Governor failure, a leaking control line, stuck unloader components, or incorrect installation may cause continuous pumping.
Excessive compressor cycling: Air leaks, high accessory demand, a small reservoir system, governor problems, or incorrect pressure settings may cause frequent loading.
Excessive oil in the air system: Compressor wear, excessive crankcase pressure, restricted oil return, high duty cycle, inlet restriction, or engine-related problems may contribute to oil carryover.
Carbon in the discharge line: Excessive heat, restricted flow, long discharge piping, high duty cycle, oil contamination, or inadequate cooling may create deposits.
Compressor overheating: Low coolant flow, cooling-system restrictions, incorrect installation, high duty cycle, or discharge-line problems may be responsible.
Coolant leakage: Damaged gaskets, loose fittings, cracked components, or corrosion can allow coolant to escape.
Oil leakage: Damaged seals, loose fittings, mounting problems, excessive crankcase pressure, or gasket failure may cause leakage.
Unusual noise: Drive-gear wear, bearing damage, loose mounting, internal wear, or engine gear-train problems may create knocking, grinding, or rattling.
Air dryer purges too frequently: A system leak, governor problem, high accessory demand, or compressor-control problem may cause repeated purge cycles.
Pressure exceeds the normal range: Governor malfunction, blocked control plumbing, stuck unloaders, or incorrect system configuration may prevent cut-out.

Safety and Service Precautions

Commercial air-brake systems store compressed air that can cause injury if released unexpectedly.

Before servicing the compressor or connected air system:

Park the vehicle on a level surface.
Apply approved parking procedures.
Block or chock the wheels.
Drain air pressure from all reservoirs.
Confirm that stored pressure has been released.
Allow the engine and compressor to cool.
Avoid contact with the hot discharge line.
Disconnect electrical power when required.
Follow engine shutdown and lockout procedures.
Use approved lifting and service equipment.
Wear appropriate personal protective equipment.
Do not loosen pressurized air, coolant, or oil connections.
Do not operate the engine with exposed drive gears.
Do not modify the compressor mounting or drive system.
Do not reuse damaged fittings, lines, gaskets, or fasteners.

The compressor discharge line can reach extremely high temperatures. Air-system components near the compressor should be allowed to cool before inspection.

After service, the vehicle should be tested for air-pressure buildup, leakage, governor operation, air-dryer purging, warning-system operation, and proper brake performance.

Identification Information

Identification information may be located on a metal tag or stamped area attached to the compressor.

Record the following:

Compressor manufacturer
Complete Bendix model designation
Bendix part number
Serial number
Remanufactured part number when applicable
Vehicle manufacturer
Vehicle identification number
Vehicle model and model year
Engine manufacturer
Engine model
Engine serial number
Compressor mounting style
Drive-gear information
Cylinder-head orientation
Air-inlet location
Discharge-port location
Coolant-port arrangement
Oil-supply connection
Governor-control arrangement

Do not identify a replacement compressor solely by appearance or the Tu-Flo 550 family name.

Photographs of the tag, mounting flange, drive gear, cylinder head, and port locations can help verify the correct replacement.

Buying Considerations

Confirm that the original compressor is a Bendix Tu-Flo 550.
Record the complete Bendix part number.
Check for superseded part numbers.
Verify the vehicle identification number.
Record the engine model and serial number.
Confirm the mounting-flange design.
Verify drive-gear compatibility.
Confirm rotation and drive ratio.
Match the cylinder-head orientation.
Verify inlet and discharge connections.
Confirm oil-supply and oil-drain arrangements.
Match coolant-port locations.
Confirm governor compatibility.
Determine whether a new or remanufactured unit is appropriate.
Check whether the drive gear is included.
Check whether fittings, gaskets, and mounting hardware are included.
Inspect the discharge line and air dryer before installation.
Correct air-system leaks before replacing the compressor.
Choose a qualified commercial air-brake or engine technician.

Variants and Configurations

The Tu-Flo 550 designation includes multiple application-specific compressor arrangements.

Differences may include:

Bendix part number
New or remanufactured construction
Mounting flange
Drive gear
Gear tooth count
Gear offset
Compressor rotation
Cylinder-head design
Cylinder-head orientation
Air-inlet connection
Discharge-port location
Coolant-port placement
Oil-supply connection
Oil-drain configuration
Governor-control plumbing
Rear-cover design
Engine manufacturer application
Vehicle manufacturer application
Accessory drive arrangement

The complete part number and application information should always be used when comparing compressors or ordering replacement components.

Comparison to Similar Equipment

Compared with the Bendix BA-921 Air Compressor, the Tu-Flo 550 is an earlier two-cylinder reciprocating compressor design used across numerous established commercial-vehicle applications. The BA-921 uses a different compressor architecture, mounting arrangement, and application range.

Compared with larger Bendix Tu-Flo compressor models, the Tu-Flo 550 may provide lower nominal air delivery but can be appropriate for vehicles with moderate compressed-air demand.

Compared with smaller compressors, the Tu-Flo 550 can support more demanding air-brake systems, although actual suitability depends on compressor speed, reservoir capacity, accessory demand, and duty cycle.

Compared with an electric air compressor, the Tu-Flo 550 is mechanically driven by the engine and normally shares the engine’s lubrication and cooling systems.

Tu-Flo compressors with different model designations should not be assumed interchangeable. Air delivery, mounting, drive components, cylinder heads, and ports may differ.

Best Fit For

Vehicles originally equipped with a Bendix Tu-Flo 550
Medium-duty trucks requiring an engine-driven air compressor
Heavy-duty trucks and tractors
Commercial buses
Vocational vehicles
Specialty commercial chassis
Fleets maintaining older Bendix air systems
Vehicles with compatible engine mounting and drive arrangements
Operators with access to Bendix technical and service support
Applications where a correct new or remanufactured replacement is available
The Tu-Flo 550 is best treated as an application-specific replacement rather than a universal compressor conversion.

Related Vehicle and Trailer Types

Complete Guide to Semi Truck Types
Class 6 vs Class 7 vs Class 8 Trucks
Highway tractors
Regional tractors
Day cab trucks
Sleeper trucks
Straight trucks
Dump trucks
Concrete mixers
Refuse trucks
Utility trucks
Municipal trucks
Buses
Fire apparatus
Emergency vehicles
Recovery vehicles
Specialty commercial vehicles

Related Truck and Trailer Models

Related Brake System Types

Related Brake Products

Related Equipment Systems

Brake Systems
Engines
Transmissions
Axles & Differentials
Suspension Systems
Electrical Systems
Equipment Systems
Air dryers
Air reservoirs
Compressor governors
Air lines and fittings
Pressure-protection valves
Vehicle air-management systems

Related Guides

Regulatory and Compliance Notes

The air compressor is part of a safety-critical commercial-vehicle braking system.

The complete air system must meet applicable requirements for:

Air-pressure buildup
Governor cut-in and cut-out
Low-air warning operation
Reservoir capacity
Service-brake operation
Parking-brake operation
Emergency-brake operation
Air-system leakage
Compressor performance
Trailer air supply

Replacement components should maintain the vehicle’s approved air-system configuration.

Installing a compressor with greater apparent capacity does not automatically increase the vehicle’s certified ratings or braking capability.

Technicians performing commercial air-brake work may be subject to training, qualification, inspection, or licensing requirements depending on the jurisdiction and work performed.

Real World Operating Notes

A compressor is often blamed when a vehicle builds air slowly, but system leaks, restricted discharge lines, governor problems, air-dryer faults, and accessory demand should be checked before replacement.

Excessive compressor duty cycle can shorten the service life of the compressor and air dryer. Correcting air leaks may be more important than installing a replacement compressor.

Oil found in the air reservoirs does not always prove that the compressor alone has failed. Engine condition, crankcase pressure, inlet restriction, discharge temperature, duty cycle, and air-dryer maintenance should also be evaluated.

The compressor discharge line should be inspected whenever a compressor is replaced. Installing a new compressor while leaving a heavily restricted or carbon-filled discharge line can damage the replacement unit or prevent normal air-system operation.

Vehicles with added pneumatic equipment may place greater demand on the compressor than the original vehicle configuration was designed to support.

Frequently Asked Questions

What is the Bendix Tu-Flo 550?

The Bendix Tu-Flo 550 is a two-cylinder, engine-driven reciprocating air compressor used to supply compressed air for commercial-vehicle air-brake systems and approved pneumatic accessories.

Is the Tu-Flo 550 an air-brake compressor?

Yes. It is part of the vehicle’s compressed-air supply and charging system.

Does the compressor apply the brakes directly?

No. It produces compressed air and sends it to the air dryer and reservoirs. Control valves and brake chambers use the stored air to apply the brakes.

Is the Tu-Flo 550 engine driven?

Yes. It is normally mechanically driven by the engine through an application-specific gear or coupling arrangement.

Is it lubricated by the engine?

Most Tu-Flo 550 installations receive pressurized lubricating oil from the engine. The exact oil-supply and return arrangement depends on the application.

Is it water cooled?

The Tu-Flo 550 commonly uses engine coolant circulated through the compressor cylinder head and related passages.

What controls compressor pressure?

A governor monitors air-system pressure and controls when the compressor loads and unloads.

Why does the compressor run frequently?

Common causes include air-system leaks, high accessory demand, governor problems, reservoir problems, or normal operation under a demanding duty cycle.

What causes slow air-pressure buildup?

Possible causes include air leaks, a restricted inlet, blocked discharge line, worn compressor components, governor problems, air-dryer restrictions, low engine speed, or excessive air consumption.

What causes oil in the air tanks?

Possible causes include compressor wear, restricted inlet air, excessive duty cycle, engine crankcase pressure, poor oil drainage, or other engine-related conditions.

Are all Tu-Flo 550 compressors interchangeable?

No. Mounting, gears, ports, cylinder heads, rotation, and engine applications can differ.

Can a Tu-Flo 550 be replaced with a BA-921?

Not automatically. The replacement must be approved for the engine, mounting system, drive arrangement, air demand, and complete vehicle application.

How can the correct replacement compressor be identified?

Use the Bendix part number, compressor tag, vehicle VIN, engine model, engine serial number, mounting arrangement, drive gear, and port configuration.

Availability and Where to Find

Bendix Tu-Flo 550 compressors may be available as new service units, genuine remanufactured units, aftermarket replacements, used components, or rebuildable cores, depending on the exact part number.

Replacement compressors and service components may be available through:

Bendix distributors
Commercial-truck dealerships
Engine dealerships
Heavy-duty parts suppliers
Fleet maintenance facilities
Commercial air-brake specialists
Authorized remanufacturers
Online heavy-duty parts suppliers

Before ordering, buyers should confirm the complete Bendix part number, engine application, mounting flange, drive gear, cylinder-head orientation, air ports, coolant connections, and oil connections.

Technical support, parts identification, documentation, and distributor resources are available through the Bendix Services and Support website.

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