Model..........................................U-450
Ignition timing .............................Top dead center
Boom hoist drum shaft ............... 96.8 rpm
Number. of cylinders .................6
Boom hoist drum shaft,
Horsepower ................................92.5 net hp at 1800 rpm
lowering ...................................... 45.8 rpm
full load
Boom hoist drum line
Intake valve tappet clearance
speed, lowering .......................... 112.5 feet per minute
(hot) .....................................0.024 to 0.026 inch
Revolving frame rotation ............ 4.06 rpm
Exhaust valve tappet clearance
(7) Rated capacities.
(hot) ....................................0.024 to 0.026 inch
Crane
20 tons (See rating
Displacement .............................450.9 cubic inches
plate)
Governed speed ........................2025:25
Clamshell ................................... cubic yard
Low idle speed ...........................475 to 525 rpm
Dragline ...................................... 4 cubic yard
Maximum oil pressure at
Backhoe ..................................... cubic yard
governed speed ...................35 to 45 psi (approx.)
Shovel ........................................ 4 cubic yard
Minimum oil pressure at low
Rear drum line pull,
idle .......................................8 to 15 psi
sea level............................... 15,900 pounds
Electrical system.........................24 volts, negative
Rear drum line pull,
ground
5000 feet altitude ................. 12,550 pounds
Spark plug gap ...........................0.015 to 0.030 inch
Front drum line pull,
Distributor point gap ...................0.022 inch
sea level............................... 15,400 pounds
Front drum line pull,
(4) Dimensions and transportation data.
5000 feet altitude ................ 12,200 pounds
Overall length, with boom in
Boom hoist drum line pull........... 7,000 pounds
travel position .......................536 inches
Overall length, without boom ......326.25 inches
(8) Fuel, water, oil, and grease capacities,
Overall width...............................119 inches
Carrier.
Overall height, at gantry
Engine fuel tank ......................... 75 gallons
sheave shaft.........................149.25 inches
Cooling system........................... 40 quarts
Shipping cubage.........................3,354 cubic feet
12 quarts including
Shipping tonnage........................85 tons
filter
Transmission .............................. 8 quarts
(5) Approximate weights.
Drop box..................................... 4 quarts
Truck crane with counterweight
Transfer case ............................. 8 pints
and boom .............................59,860 pounds
Front axle ................................... 11 quarts
Truck crane with counterweight
Forward rear axle ....................... 111A quarts
and without boom.................55,380 pounds
Rear axle ................................... 11 quarts
Carrier 29,640 pounds
Steering gear and tank ;............. 7 pints
Crane upper with counterweight.25,740 pounds
Crane upper without counter ......20,360 pounds
(9) Fuel, water, and oil capacities, Crane
weight ..................................
Engine fuel tank ......................... 50 gallons
Boom tip section with two
Cooling system........................... 35 quarts
guy lines attached ................1,460 pounds
9 quarts including
Boom insert, 10 foot ...................500 pounds
filter
Guy lines, 10 foot, set of two ......100 pounds
Transmission .............................. 9 pints
Boom base section .....................1,020 pounds
Gear and chain case .................. 18 gallons
Upper spreader ..........................220 pounds
Hydraulic system reservoir......... 3 quarts
Hook block..................................480 pounds
Boom backstops with pins .........1,000 pounds
(10) Working ranges. Refer to TM 5-3810-294-10
Fairlead ......................................32 pounds
for the working ranges of the front end attachments
furnished with the model M320T2
(6) Speeds (full throttle and full load.)
truck crane.
Rear drum shaft..........................48.4 rpm
(11) Wiring diagram. Refer to TM 5-3810-294-20
Rear drum shaft lowering ...........Gravity
for the truck crane wiring diagram.
Front drum shaft raising .............48.4 rpm
(12) Hydraulic schematic. Refer to figure 1-1
Front drum shaft lowering...........26.175 rpm
for the schematic of the upper hydraulic system.
Front drum line speed,
lowering................................92.4 feet per minute
1-2
