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• Manufacturer:
  Astec Underground
• Model:
  RT660 II

ENGINE
John Deere 5050 - 4 cylinder, diesel engine
Bore/stroke: 3.39 x 4.13" (86.11 x 104.90 mm)
Displacement: 186 C.I.D. (3.05 L)
Direct fuel injection and liquid cooling
Horsepower - Gross: 75 (56 kW) @ 2800 rpm, Net: 63 (47 kW) @ 2200 rpm
Maximum torque - Gross: 204 lb/ft (264 N·m) @ 1200 rpm

SERVICE CAPACITIES
Fuel tank: 17 gal (64 L)
Cooling system: 18 qt (17 L)
Engine with oil filter: 11.6 qt (11 L)
Hydraulic reservoir: 14 gal (53 L)
Total hydraulic: 20 gal (75.8 L)
Transmission: 1.8 qt (1.7 L)
Axle center (each): 4 qt (3.8 L)
Planetaries (each): 0.65 qt (0.6 L)
Trencher planetary drive: 1.5 qt (1.4 L)
Hydra-Borer System: 1.0 qt (0.9 L)

TIRES
31 x 15.50 x 15, 8 PR
35 x 19.00 x 16.1, 12 PR (heavy-duty)

POWERTRAIN
Transmission: 4-F-4R Hydrostatic with hi-lo shift on the go
Drive: Hydrostatic 4WD, diff-lock, differential and outboard planetaries on both
front and rear axles.
Service brakes: Hydrostatic
Axle ratio: 11.6:1
Planetaries: 6:1 – Outboard
Differentials: Electrically actuated
Steering: 2W, 4W and crab
Axle oscillation: 20°
Travel speeds
1st - 1.4 mph (2.2 km/h)
2nd - 1.9 mph (3.1 km/h)
3rd - 5.0 mph (8.2 km/h)
4th - 7.4 mph (11.9 km/h)
(Rated speeds in forward and reverse)

ELECTRICAL SYSTEM
Voltage: 12 volts, negative ground
Alternator: 65 amp
Starter: 3.35 hp (2.5 kW)
Battery: 685 CCA@ 0°F (-17.7° C)

OPERATOR ENVIRONMENT
2-post ROPS and Key start
Left and right entry/exit
Unobstructed operator platform
Swivel seat with seat belt
Hand and foot controls
Iso-mounted platform

DIMENSIONS
Overall height – prime mover (to top of muffler): 91.5" (2.32 m)
Overall length – prime mover: 98.8" (2.51 m)
Overall transport length with backhoe and trencher with 4 ft (1.22 m) boom: 232.3" (5.9 m)
Angle of approach – prime mover: 80°
Angle of departure – prime mover: 90°
Minimum ground clearance – (axle to ground): 9.8" (249 mm)
Minimum ground clearance with backfill blade: 7.4" (188 mm)
Wheelbase: 65" (1.65 m)
Height to centerline of trencher headshaft: 26.3" (668 mm)
Angle of departure with trencher attachment: 34°
Trencher boom angle down from horizontal: 65°
Trencher boom angle up from horizontal: 50°
Backhoe transport height: 108.8" (2.76 m)
Backfill blade height: 14.3" (363 mm)
Backfill blade lift height: 15.4" (391 mm)
Backfill blade depth of cut below grade: 5.9" (150 mm)
Transport height, plow frame base: 91.5" (2.32 m)
Center of rear wheel to rear of plow with chute in ground: 112.2" (2.85 m)
Plow swing angle: 25°
Plow offset from centerline: 32" (813 mm)
Maximum trencher dig depth: to 72" (1.83 m)
Digging width: 6 to 16" (152.4 to 406.4 mm)

ANGLE OF DEPARTURE BASE TRACTOR/PLOW ATTACHMENT RAISED:
with 30" (762 mm) mounted blade: 26°
without mounted blade: 27°

PLOW BLADE TIP GROUND CLEARANCE BASE TRACTOR:
with 30" (762 mm) mounted blade: 24.9" (632 mm)
Overall width base tractor: 70" (1.78 m)
Overall width with optional tires 78.0" (1.98 m)
Tread width (centerlines) base tractor: 55.0" (1.4 m)
Turning radius (outside) base tractor - 4-wheel steer:
Left – 119.5 in (3.03 m)
Right – 119.5 in (3.03 m)
Operating weight: 10,304 lbs (4,673 kg)