Torque Specifications; Dimensional Data; Maintenance Kits And Available Service Parts; Compressor Troubleshooting - BENDIX TU-FLO 750 COMPRESSOR Manual

Minimum oil pressure required at
engine idling speed ............................................ 15 PSIG
Minimum oil pressure required at
maximum governed engine speed ...................... 15 PSIG
Minimum discharge-line size .............................. 1/2" I.D.
Minimum coolant-line size .................................. 3/8" I.D.
Minimum oil-supply line size ............................. 3/16" I.D.
Minimum oil-return line size ................................ 1/2" I.D.
Minimum air-inlet line size .................................... 5/8" I.D.
Minimum unloader-line size ............................... 3/16" I.D.

TORQUE SPECIFICATIONS

Bolt, Nut or Screw ............................ Assembly Torque
Cylinder Head .................................................... 300 - 360
Unloader Cover Plate ......................................... 175 - 225
Discharge Valve Seat .............. 840 - 1,080 (70-90 ft. Ibs.)
Inlet Valve Stop ........................ 840 - 1,080 (70-90 ft. Ibs.)
End Cover ......................................................... 175 - 225
Connecting Rod ................................................ 150 - 170
Bottom Cover .................................................... 175 - 225
Air Strainer ........................................................ 125 - 150
Inlet Fitting ........................................................ 175 - 225
Discharge Fitting ............................................... 175 - 225
Governor or Governor Adapter ............................ 175 - 225
Pipe Plugs
1/16 ..................................................................... 35 - 50
1/8 ..................................................................... 85 - 105
1/4 .................................................................... 130 - 170
3/8 .................................................................... 160 - 200
1/2 .................................................................... 200 - 270
Pipe Bushing
1/2 .................................................................... 175 - 225
Crankshaft Nut:
Marsden or Castle ............ 1,200 - 1,400 (100-120 ft. lbs.)
P/N 298125
(Metric Thread) ................... 2,640 - 3,048 (220-254 ft. lbs.)

DIMENSIONAL DATA

Port Sizes
Water inlet ................................................... 1/2 - 14 NPT
Water outlet ................................................. 1/2 - 14 NPT
Air discharge ................................................ 1/2 - 14 NPT
Governor ...................................................... 1/8 - 27 NPT
Oil inlet (end cover) ...................................... 1/8 - 27 NPT
Piston
(standard) ....................................................... 2.77825 in.
(.010 oversize) ................................................ 2.78825 in.
(.020 oversize) ................................................ 2.79825 in.
(.030 oversize) ................................................ 2.80825 in.
Cylinder bore
(standard) ......................................................... 2.7810 in.
(.010 oversize) .................................................. 2.7910 in.
(.020 oversize) .................................................. 2.8010 in.
(.030 oversize) .................................................. 2.8110 in.
14
MAINTENANCE KITS AND AVAILABLE SERVICE
PARTS
Cylinder Maintenance Kit.
Piston Ring Kit (standard and oversizes.)
Piston and Rod Kit (standard and oversizes.)
Crankshaft Bearing Kit.
Gasket & Seal Kit.

COMPRESSOR TROUBLESHOOTING

IMPORTANT: The troubleshooting contained in this section
(in. Ibs.)
considers the compressor as an integrated component of
the overall air brake charging system and assumes that an
air dryer is in use. The troubleshooting presented will cover
not only the compressor itself, but also other charging sys-
tem devices as they relate to the compressor.
WARNING! PLEASE READ AND FOLLOW
THESE
PERSONAL INJURY OR DEATH:
When working on or around a vehicle, the following
general precautions should be observed at all times.
1. Park the vehicle on a level surface, apply the
parking brakes, and always block the wheels.
Always wear safety glasses.
2. Stop the engine and remove ignition key when
working under or around the vehicle.
working in the engine compartment, the engine
should be shut off and the ignition key should be
removed. Where circumstances require that the
engine be in operation, EXTREME CAUTION should
be used to prevent personal injury resulting from
contact with moving, rotating, leaking, heated or
electrically charged components.
3. Do not attempt to install, remove, disassemble or
assemble a component until you have read and
thoroughly understand the recommended
procedures. Use only the proper tools and observe
all precautions pertaining to use of those tools.
4. If the work is being performed on the vehicle's air
brake system, or any auxiliary pressurized air
systems, make certain to drain the air pressure
from all reservoirs before beginning ANY work on
the vehicle. If the vehicle is equipped with an
AD-IS ™
be sure to drain the purge reservoir.
5. Following
recommended procedures, deactivate the electrical
system in a manner that safely removes all electrical
power from the vehicle.
6. Never exceed manufacturer's recommended
pressures.
INSTRUCTIONS
air dryer system or a dryer reservoir module,
the vehicle
TO AVOID
When
manufacturer's