TM 9-2320-285-10
1-9.
EQUIPMENT DATA
GENERAL
ELECTRICAL
Ottawa vehicle model ........................................ Model 50
System type ................................. 12 volt negative ground
Serial numbers .....................................55001 thru 55175
Batteries ........................................Four 12 volt, lead-acid
Vehicle weight .......................................... 15,520 pounds
Alternator ............................................ 12 volt, 90 ampere
Front ..................................................... 9,740 pounds
Starter type ......................................... Overrunning clutch
Rear ..................................................... 5,780 pounds
Maximum GVW ................................. 43,500 pounds
FRONT AXLE
Make .................................................. Rockwell Standard
ENGINE
Model .................................................... FF931-RDAX-72
Make .......................................................... .Detroit Diesel
Capacity ................................................... 12,000 pounds
Model ...............................................................5067-5340
Suspension ..................................... Semi-elliptical spring
Design .................................................................. 6V-53T
Brakes ......................................................... 15 x 5 inches
Type ....................................... Overhead 4-Valve, 2-cycle
Tires ..................................................... 12:00 x 20, 16 ply
No. of cylinders ............................................................... 6
Inflation pressure ................................................. 120 PSI
Displacement ......................................... 318 cubic inches
Bore ............................................................. 3.875 inches
REAR AXLE
Stroke .............................................................. 4.5 inches
Make .................................................. Rockwell Standard
Compression ......................................................... 18.7:1
Model ................................................................... PX-149
Brake horsepower ......................... 225 HP @ 2600 RPM
Type ....................................................................... U-240
Torque .............................................. 550 ft/lbs1800 RPM
Load rating ............................................... 31,500 pounds
Governed speed (full load) .............................. 2600 RPM
Suspension ............................................... Rubber mount
Governed speed (no load) ............................... 2800 RPM
Reduction ratio ..................................................... .11.36:1
Idle speed .......................................................... 600 RPM
Brakes ...................................................16-1/2 x 7 inches
Firing order ....................................... 1L-3R-3L-2R-2L-1R
Tires
Oil capacity (includes 2 quarts required for oil filter
(dual mounted) .............................. 12:00 x 20, 16 ply
replacement .16 quarts
Inflation pressure ................................................. 120 PSI
Oil pressure, hot ........................................... 40 to 60 PSI
minimum 18 PSI @ 1200 RPM
FIFTH WHEEL
Hydraulic cylinders ..............................Two double-acting
TRANSMISSION
Unlatch ........................................Cab control (pneumatic)
Make ................................................Detroit Diesel Allison
Relatch .............................................................. Automatic
Model .....................................................................MT653
Lift frame ................................................ Fore and aft tilt,
Speeds .............................................5 forward, 1 reverse
no side tilt
Governor pressure ..................... 54-58 PSI @ 1500RPM
Capacity ................................................... 70,000 pounds
Main fluid pressure ......................... 125 PSI @ 600 RPM
Lift .............................................................. 16-3/8 inches
Fluid temperature .............................. 160-220 degrees F
Dry weight ............................................................ 540 lbs.
GENERAL CAPACITIES
Gear ratios (mechanical) ................................First 8.05:1
Cooling system (incl. engine, radiator,
Second 3.58:1
and heaters) ............................................... 50 quarts
Third 2.09:1
Engine crankcase ............................................. 14 quarts
Fourth 1.39:1
Transmission
Fifth 1.00:1
(with new filter) ............................................ 16 quarts
Reverse 5.67:1
Fuel tank .........................................50 gallons diesel fuel
Power steering system ........................................ 4 quarts
Hydraulic system ..............................................10 gallons
Differential ............................................................38 pints
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