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®
Bendix
®
Tu-Flo
®
DISCHARGE
VALVE STOP
DISCHARGE
VALVE
DISCHARGE
VALVE SEAT
CRANKCASE
PISTON RINGS
CONNECTING
ROD
CRANKSHAFT
BENDIX
®
TU-FLO
(CROSS SECTION)
DESCRIPTION
The function of the air compressor is to provide and main-
tain air under pressure to operate devices in the air brake
and/or auxiliary air systems. The Tu-Flo
is a two cylinder single stage, reciprocating compressor
with a rated displacement of 16.5 cubic feet per minute
at 1,250 RPM.
The compressor assembly consists of two major
subassemblies, the cylinder head and the crankcase. The
cylinder head is an iron casting which houses the inlet,
discharge, and unloader valving. (See Figure 1.) The
cylinder head contains the air inlet port and is designed
with both top and side air discharge ports. Three water
coolant ports provide a choice of coolant line connections.
Governor mounting surfaces are provided at both the front
and the rear of the cylinder head. The head is mounted
on the crankcase and is secured by six cap screws. The
®
Tu-Flo
750 compressor is designed such that the cylinder
head can be installed in one of two positions which are 180
degrees apart. The crankcase houses the cylinder bores,
pistons, crankshaft and main bearings, and provides the
fl ange or base mounting surface.
750 Air Compressor
UNLOADER
COVER
DISCHARGE
VALVE SPRING
®
750 AIR COMPRESSOR
®
750 compressor
AIR DISCHARGE
WATER
INLET
GOVERNOR
MOUNTING
PAD
PISTON
BENDIX
CYLINDER
HEAD
END VIEW OF CYLINDER HEAD
CYLINDER
HEAD
®
TU-FLO
®
750 AIR COMPRESSOR
(EXTERIOR)
UNLOADER
WATER OUTLET
AIR INLET
CRANKCASE
PIECE NO.
TAG
INLET VALVE
INLET VALVE
SEAT
INLET
INLET VALVE
SPRING
1
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Table of Contents
Related Manuals for BENDIX Tu-Flo 750
Summary of Contents for BENDIX Tu-Flo 750
- Page 1 ® Bendix ® Tu-Flo ® 750 Air Compressor DISCHARGE UNLOADER CYLINDER AIR DISCHARGE VALVE STOP COVER HEAD WATER OUTLET DISCHARGE VALVE WATER INLET DISCHARGE AIR INLET VALVE SEAT CRANKCASE DISCHARGE VALVE SPRING GOVERNOR CRANKCASE PISTON RINGS MOUNTING PISTON CONNECTING CRANKSHAFT PIECE NO.
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Page 2: Operation
(Note: The discharge valve remains on its seat.) Atmospheric air TU-FLO 750 COMPRESSOR is drawn through the air strainer and the open inlet valve BENDIX NO. - Page 3 UNLOADER DISCHARGE GOVERNOR PISTON GOVERNOR DISCHARGE PORT PORT PORT PORT INLET PORT INLET PORT INLET VALVE INLET HELD OPEN VALVE DISCHARGE DISCHARGE BY UNLOADER OPEN VALVE VALVE PISTON CLOSED CLOSED PISTON MOVING DOWN FIGURE 4 - OPERATIONAL-LOADED (INTAKE) FIGURE 6 - OPERATIONAL-UNLOADED governor closes and exhausts the air from above GOVERNOR the unloader pistons.
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Page 4: Duty Cycle
The typical size of a vehicle's discharge line, (see column 2 of Table A in the Troubleshooting section) assumes a compressor with a normal (less than 25%) duty cycle, operating in a temperate climate. See Bendix and/or other air dryer manufacturer guidelines as needed. THREAD... -
Page 5: Air Induction
"cut-out" setting. For vehicles with accessories that are sensitive to small WATER ® amounts of oil, we recommend installation of a Bendix ® ™ PuraGuard oil coalescing fi lter, designed to minimize WATER the amount of oil present. -
Page 6: Preventative Maintenance
If a previously unturbocharged compressor is being AIR INDUCTION turbocharged, it is recommended that the inlet cavity screen One of the single most important aspects of compressor (238948) be installed with an inlet gasket (291909) on both preventive maintenance is the induction of clean air. sides of the screen. - Page 7 In addition, When the engine air cleaner is replaced: Some compres- Bendix has developed the "Bendix Air System Inspection sors are fi tted with compressor intake adapters, which allow Cup" or BASIC test to help substantiate suspected exces- the compressor intake to be connected to the engine air sive oil passing.
- Page 8 CYLINDER HEAD returned to the nearest authorized Bendix distributor for a Remove the six cylinder head cap screws (1) and tap the factory remanufactured compressor. If it is not possible, head with a soft mallet to break the gasket seal.
- Page 9 4. Remove the inlet valve stops (14), valves (17), valve CLEANING OF PARTS GENERAL seats (11), valve springs (12) and gaskets (10). It is All parts should be cleaned in a good commercial grade of recommended that a tool such as a J-25447-B, produced solvent and dried prior to inspection.
- Page 10 CYLINDER HEAD 33 32 CRANKCASE BALL BEARING (MACK EXTENDED FLANGE) NAMEPLATE FIGURE 11 - EXPLODED VIEW ITEM DESCRIPTION ITEM DESCRIPTION ITEM DESCRIPTION Cylinder Head Cap Screws Discharge Valve Stop Crankshaft Unloader Plate Cap Screws Discharge Valve Spring Crankshaft Key Unloader Plate Lock Washers Discharge Valve Thrust Washer Unloader Plate...
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Page 11: Piston Rings
in. should be rebored or honed oversize. Oversized pistons scored or worn or out of round and cannot be reground, the and piston rings are available in .010 in., .020 in. and .030 compressor must be replaced. Connecting rod bear- in. - Page 12 SEGMENT RING (24) Tu-Flo ® 750 compressor are similar to those of other Bendix compressor models but may be identifi ed by the piston diameter and the distance to the center of the wrist pin from the top of the piston as shown in Figure 13.
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Page 13: Cylinder Head
2. Install the compression rings (23) in the proper grooves FINAL COMPRESSOR ASSEMBLY with the “pip” mark toward the top of the piston. (Refer Install all crankshaft keys making certain to support the to Figure 14.) crankshaft to avoid bearing damage. Install the crankshaft nut where applicable. -
Page 14: Torque Specifications
Minimum oil pressure required at MAINTENANCE KITS AND AVAILABLE SERVICE engine idling speed ..........15 PSIG PARTS Minimum oil pressure required at Cylinder Maintenance Kit. maximum governed engine speed ....15 PSIG Piston Ring Kit (standard and oversizes.) Minimum discharge-line size ......1/2" I.D. Minimum coolant-line size ......... - Page 15 7. Never connect or disconnect a hose or line containing pressure; it may whip. Never remove a component or plug unless you are certain all system pressure has been depleted. 8. Use only genuine Bendix ® replacement parts, components and kits. Replacement hardware, tubing, hose, fi...