Equipment Specifications Library

Basic Model Information

  • Manufacturer:
    Astec Underground
  • Model:
    RT660 II

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Additional Info

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)

This information is provided for informational purposes only. HDD Broker LLC cannot warrant the accuracy or completeness of this information. This information is subject to change by the manufacturer. Some specifications may vary by model year.

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