772a motorgrader specifications – John Deere MOTOR GRADER 772A User Manual
Page 2
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772A MOTORGRADER SPECIFICATIONS
(Specifications and design subject to change without notice. Wherever applicable, specifications
are in accordance
with SAE Standards.
Except where otherwise noted, these specifications
are based on a unit with 13.00-24, 12-PR, tubeless
tires on 8 in. (254 mm) rims, 12-ft. (3.65 m) moldboard with 6-in. (152 mm) cutting edge, and standard
equipment.
Weights include
lubricants, coolants, full fuel tank and 175 lb. (79 kg) operator.)
Rated Power
@2300 rpm:
SAE
Net
150hp(112kW)
Gross..
.. .. .. .. .. .. .. .. .. . 160 hp (119 kW)
Net engine power is with standard equipment including air cleaner, exhaust system, alter-
nator, and cooling fan, at standard conditions per SAEJ1349 and DIN
70020,
using No. 2-
D fuel @35 API gravity. No derating is required up to 10,000 ft. (3050 m) altitude. Gross
power is without
cooling
fan.
DIN 70 020
112kW
Engine:
John Deere 6-466A
Type.
. . . . . . . . 4-stroke cycle, turbocharged
and intercooled
diesel
Bore and stroke.
. . . . . . . . . . . . . . .4.56 x 4.75 in. (116 x 121 mm)
No.ofcylinders
6
Displacement
466cu.in.(7.638L)
Compression
ratio
14.9t01
Maximum net torque @1300 rpm . . . . . 4651b-ft (630 Nm) (64 kg-m)
Lubrication.
. . . . . . . . . . . . . . . . . . Pressure system w/full-flow filter
Coolingfan
Suctiontype
Aspiratedair cleanerw/restrictionindicator. . . . . . . . . . . . . . . . Dry
Electrical system. . . . . . . . . . . . . . . . . .
24
volt
w/42
amp
alternator
Batteries (two 12-volt)
Reserve capacity: 360 minutes
Transmission.
. . . . . . . . . . . . . . . . . . .
Direct drive, full power shift
with planetary gear reductions. Foot inching pedal.
Travel Speeds (2200 engine rpm, no tire slip, 14.00-24tires):
Shift Lever
Position
Forward
Reverse
mph
km/h
mph
km/h
1
2.3
3.7
3.0
4.8
2
3.3
5.3
4.2
6.8
3
5.2
8.9
6.6
10.6
4
6.7
10.8
8.6
13.9
5
8.8
14.2
6
11.5
18.5
7
14.6
23.6
8
25.1
40.4
Differential Lock. . . . . . . . . . Foot-operated, hydraulically actuated
Rear Drive.
. . . . . . . . . . . . . . . . . . ..
Inboard planetary final drives
with heat-treated, splined steel torque shafts. Oscillating
welded con-
struction tandems; nodular cast sprockets driving 2 in. (51 mm) pitch
roller chain in oil bath.
Front
Drive.
. . . . . . . Standard and optional systems are available
to match different
applications.
Both use a variable-displacement
pump, a reversible motor in each wheel, and a flow divider to assure
front wheel traction.
System has two operational
modes and free-
wheels at transport speeds or when not in use.
Standard system -
effective in gears 1-4 . . 5.03 in3 (89 cm3) pump,
2.03 in3 (33 cm3) motors
High speed system -
effective in gears 1-6 6.00 in3 (98 cm3) pump,
2.03 in3 (33 cm3) motors
Front Axle:
Fabricated steel box frame with planetary drives
Totaloscillation
30deg.
Wheel lean (either direction)
...20deg.
Steering:
Front.
. . . . . . . . . . . . . . . . . . Full hydraulic power system. Steering
capabilities
without engine power
Rear. . . . . . . . . . . . . . . . ..
Hydraulically
articulated
frame steering
(25 deg. left or right)
Minimumturningradius
22ft.6in.(6.86m)
Brakes:
Service
Foot-operated,hydraulically
actuated, wet-disk, effective on 4 tandem wheels
Parking.
. . . . . . . . . . . . . . . . . Foot-operated,
mechanical,
dry-disk,
effective on 4 tandem wheels
Hydraulic
System:
Closed center w/pressure
controlled 4.0 cu. in. (65 cm3) variable-dis-
placement pump.
. . . . . . . . . 36 gpm (2.27 Us) @2200 engine rpm
Moldboard.
. . . . . . . . . . . . . . . . . Wear-resistant high-carbon steel
Length
12ft.(3.66m)
Height
24in.(610mm)
Thickness
0.88in.(22mm)
Cutting Edge:
Dura-MaX@
through-hardened curved steel
Thickness and width.
. . . . . . . . . . . . . . .0.62 x 6 in. (16 x 152 mm)
Blade
Range:
Liftaboveground
.17 in. (432 mm)
Blade side shift:
Right or left
26.9in.(683mm)
70
Shoulder reach outside wheels (frame straight):
Right
88.4in.(2.25m)
Left
89.6in.(2.28m)
Pitch at ground line
44deg.forward
10 deg. back
Blade Lift Mechanism:
Control
Dual-lever,hydraulic
Lift
Arms: Nodular cast iron
Positions
7
Control
Hydraulic,footoperated
Circle:
Fabricated steel angle construction
Circle diameter
60in.(1.5m)
Rotation
360deg.
Drive.
. . . . . . . . . . . . . . Hydraulic motor and worm gear w/positive
position lock
Sideshift,right
32.0in.(813mm)
left
33.5in.(851mm)
Drawbar
. . Welded box section, 3.5 x 7 x 0.5 in. (89 x 178 x 13 mm)
wall wlball and socket draft connection
Frame:
Rear mainframe.
. . . . . . . . . . . . . . . . . . . Welded box section from
articulation joint to mainframe arch
Width, minimum
12.03in.(306mm)
Height,minimum
11.95in.(304mm)
Thickness, sides
0.47in.(12mm)
top and bottom (min.)
0.87 in. (22 mm)
Weight per ft., minimum
120Ib.(179kg/m)
Minimum vertical section modulus.
. . . . . . . . . . . . . . . . . . .
143
in3
(2343 cm3)
Front mainframe.
. . . . . . . . . . . . . . . . . . . Welded box section from
mainframe arch to front hood
Width
10in.(254mm)
Height, minimum
13in.(330mm)
Thickness, minimum ...
...
...0.63in.(16mm)
Weightperft., minimum
.110Ib.(164kg/m)
Minimum vertical section modulus
118in3
(1935 cm3)
Tires:
13.00-24,
12-PR,
G2, standard
14.00-24,
12-PR, G2
17.5-25,
12-PR, L2
Dimensions:
Height to top of steering wheel.
. . . . . . . . . . . . . . 7 ft. 6 in.
(2.29 m)
Capacities:
U.S.
Liters
Fueltank
70gal.
265.0
Cooling system
7gal.
26.5
Engine lubrication,
includingfilter
20qt.
Transmission and
hydraulicsystem
41gal.
Tandem housings (each)
5 gal.
Worm gearbox
4qt.
Scarifier (Special Equipment):
V-type for 4 ft. (1.22 m) cut with 3 manual pitch positions
Number of teeth
5standard,90ptional
Lift above ground
24.0in.(610mm)
Penetration
13.7in.(348mm)
Shank size
1x3in.(25x76mm)
Ripper
(Special Equipment): 8 ft. (2.44 m) cut width, parallelogram
linkage, 2 manual shank vertical positions
Numberofshankpockets
5
Number of shanks
3
Liftaboveground
14.5in.(368mm)
Penetration
14in.(356mm)
Shank size
2x5in.(51x127mm)
Lift above ground (shank in upper position)
23.5 in. (597 mm)
18.9
155.2
18.9
3.8
Tire
Wheel Tread
Width
Ground Clearance
Size
Front
Rear
Front
Rear
(Front Axle)
13.00-24
76.15 in.
79.61 in.
7ft. 9.5 in.
7ft. 10 in.
22 in.
8"rim
(1.93m)
(2.02m)
(2.37m)
(2.34m)
(559 mm)
(203 mm)
14.00-24
76.15 in.
79.61 in.
7ft. 11.5 in.
8ft.
22.5 in.
10" rim
(1.93m)
(2.02m)
(2.43m)
(2.44 m)
(572 mm)
(254 mm)
17.5-25
78.40 in.
82.37 in.
8 It. 5 in.
8ft. 6 in.
23.2 in.
14" rim
(1.99m)
(2.09 m)
(2.57m)
(2.59 m)
(589 mm)
(356 mm)