Bendix Commercial Vehicle Systems BENDIX 720CC COMPRESSOR User Manual
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3. Install any supporting brackets on the compressor in
the same position(s) noted and marked during removal.
4. Inspect all air and coolant lines and fittings before
reconnecting them to the compressor. Make certain
o-ring seals are in good or new condition, the threads
are clean, and the fittings are free of corrosion. Replace
as necessary.
5. Install the discharge and coolant fittings, if applicable, in
the same position on the compressor noted and marked
during disassembly. See the Torque Specifications for
various fitting sizes and types of thread at the rear of
this manual. Tighten all hose clamps.
6. Before returning the vehicle to service, perform
the Operation and Leakage Tests specified in this
manual. Pay particular attention to all lines and hoses
disconnected during the maintenance and check for air,
oil, and coolant leaks at compressor connections and
the compressor engine interface. Also check for noisy
operation.
BENDIX
®
720
CC
TWIN CYLINDER
COMPRESSOR SPECIFICATIONS
Typical weight ....................................... 67 lbs. (30.5 kg.)
Number of cylinders ....................................................... 2
Bore Diameter .................................... 3.622 in. (92 mm)
Stroke ................................................. 2.126 in. (54 mm)
Calculated displacement at 1250 RPM ............ 31.6 CFM
Flow Capacity @ 1800 RPM & 120 psi .......... 30.3 CFM
Flow Capacity @ 3000 RPM & 120 psi ............ 45.3 CFM
Approximate horsepower required:
Loaded 1800 RPM at 120 psig ......................... 9.1 hp
Loaded 1800 RPM at 0 psig (DLU) ................. 4.4 hp
Minimum coolant flow
at maximum RPM ....................... 2.64 GPM (10 LPM)
Maximum coolant temperature ..................... 203°F (95°C)
Maximum inlet air temperature ................... 122°F (50°C)
Maximum system pressure .....................................150 psi
Minimum oil pressure required ............................... 10 psi
TORQUE SPECIFICATIONS
Assembly Torques
M8 x 1.25-6g Cylinder Head Bolts .. 221 in-lbs + 180° turn
(25 Nm + 180° turn)
M10 x 1.5 End Cover Bolts .........................195–213 in-lbs
(22 – 24 Nm)
M6 x 1 Crankcase Side Cover Bolts .............97–115 in-lbs
(11–13 Nm)
M26 x 1.5 Safety Valve .................................. 59–66 ft-lbs
(80–90 Nm)
M26 x 1.5 Discharge Port Fittings ........................ 66 ft-lbs
(90 Nm) Maximum
M16 x 1.5-6H Water Port Fittings ..................... 33.2 ft-lbs
(45 Nm) Maximum
FIGURE 11 -
CYLINDER HEAD BOLT TORQUE SEQUENCE
Sequence - Numerical order 1 through 10
Step
Torque (in-lbs)
Torque (Nm)
1
177
20
2
221
25
3
221 + 180° turn
25 + 180° turn
10
9
2
6
1
7
8
3
4
5