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Chapter 1. INTRODUCTION - TM-55-3805-248-140005
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TM-55-3805-248-14 Tractor-Scraper Wheeled M621B 14-Cubic-Yard Capacity Commercial Construction Equipment (NSN
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Figure 2-1. Tractor-scraper, wheeled M621B
TM 55-3805-248-14
CHAPTER 2
TRANSPORTABILITY DATA
Section I. GENERAL
vided for use when the vehicle is transported. The
2-1. Scope.
hitch between the two sections is noncushioned.
This chapter provides a general description and
The only contact with the ground is the four
identification photographs of the M621B tractor-
tires, except for the scraper bowl, when it is used
scraper,  as well as tabulated transportability
to scrape, and the cutting edge, when the tractor-
characteristics that are necessary for movement
scraper is parked. The transmission is an eight
of the item.
forward speed, semiautomatic power shift with a
foot-pedal-engaged differential lock. The brakes
2-2. Description.
are air-actuated, expanding shoe-type. The park
The M621B tractor-scraper is a wheeled, commer-
brake is on when air is removed.
cial construction, open-bowl-type vehicle with two
axles. The tractor section has two pneumatic
2-3. Transportability Drawings.
rubber-tired driving wheels powered by a single
Detailed side- and end-elevation transportability
diesel engine rated at 330 horsepower. The
drawings of the M621B tractor-scraper, with
scraper section is towed by the tractor section
dimensions and tiedown and lift-provision load-
and has two pneumatic rubber tires on free-
rating capacities,  a r e shown in figures 2-2
turning wheels. The articulated steering is hy-
through 2-4.
draulically operated, and a steering lock is pro-
Section II. CHARACTERISTICS AND RELATED DATA
Performance:
2-4. General Transportability Charac-
Maximum speed (eight range) . . 31 mph (50
teristics.
km/h)
These data are applicable to the model number or
Range (empty at 15 mph) . . . 176 miles (186
national stock number (NSN) shown. Changes in
km)
the model number or NSN may affect the load-
Fuel tank capacity. . .135 US gal (510 liters)
ability of the item as related to guidance shown
Turning radius . . . . . . . . . . .36.5 ft. (11.12 m)
in this manual.
Angle of approach . . . . . . . . . . . . . . . . . . . . .17
a Tractor Scraper, Wheeled, M621B.
Angle of departure. . . . . . . . . . . . . . . . . . . . .14
National stock number. . . . 3805-01-153-1854
Ground clearance . . . . . 18.5 in. (0.47 m) with
Line item number. . . . . . . . . . . . . . . . . . . . S56246
bowl raised
Ground pressure (each tire at 35 and 45 psi
Dimensions and shipping data:
inflation pressure):
Length, operational . . . . . . . 499 in. (12.67 m)
Unloaded (curb weight)
Width, tractor, operational. 116 in. (2.95 m)
Front . .42.8 to 50.3 psi (295.1 to 346.8 kPa)
Width, scraper, operational. 136 in. (3.45 m)
R e a r . . .36.4 to 39.8 psi (250.9 to 275.1 kPa)
Tread width, tractor . . . . . . . . 87 in. (2.21 m)
Ground contact area (each tire at 35 and 45
Tread width, scraper. . . . . . . . 86 in. (2.19 m)
psi inflation pressure):
Height, operational.. . . . . . . 142 in. (3.61 m)
2
2
Front . . . . 515 to 441 in (0.332 to 0.285 m )
Area, operational . . . . . 471.28 ft2 (43.71 m2)
2
2
Rear . . . . . 275 to 248 in (0.177 to 0.160 m )
3
3
Cube, operational. . .5,616.06 ft (159.03 m )
Tire type..... 29.5 x 29, 28 ply, E-2, traction
Center of gravity:
type
Above ground.. . . . . . . . . . . .51.9 in. (1.32 m)
Pressure:
From centerline of scraper wheel . .207.9 in.
Front and rear .35 to 45 psi (241.3 to 310.3
(5.23 m)
kPa)
Weights:
Axle Load:
Shipping (with fuel and liquids full). 63,910 lb
Front axle.. . . . . . . . . . . 44,098 lb (20 002 kg)
(28 989 kg)
Rear axle.. . . . . . . . . . . . . 19,812 lb (8987 kg)
2-1

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