Products > Astec > Trenchers & Plows > Astec RT660

Benefits and Features

Features

  • 67 hp Cummins 4-390, 4 cylinder, diesel engine - high horsepower in a small machine
  • 4-wheel steering
  • 4-speed ranges
  • Dual hydrostatic drives
  • Easy and simple to operate
  • Control layout commonality
  • Flat operator's platform
  • Pivoting operator's seat for operator comfort
  • Electrical, hydraulic, and hydrostatic systems
  • Common components and maintenance requirements
  • Attachments to complete underground installations
  • Limited service requirements
  • Warranty coverage and flexible warranty plans

Engine

  • Cummins 4-390 engine
  • 4-cylinder 239 CID diesel
  • Water cooled durability (2200 rpm - best in industry
  • 67 hp gross (63 hp net) fuel efficient engine  
  • Oil pan allows 45 degree tilt angle before oil starvation
  • 250 hour oil change interval  
  • Coolant recovery bottle - deletes hazard of radiator cap removal
  • Dual stage air cleaner is equipped with dust evacuator
    • Primary filter
    • Safety filter
  • Warning light for plugged filter
  • 2 year -- 2000 hour engine warranty
  • Lift-off side panels provides easy access to engine

Dual Hydrostatic System

  • Efficient hydrostatic transmission driven by step-up gearbox
  • Servo controlled to provide low control lever efforts
  • Propulsion system allows infinitely variable speeds within gears
  • Directional changes forward to reverse without clutching or shifting
  • Hydrostatic drive provides hydro-dynamic braking feature
  • Attachment drive flexibility - power control for conditions
  • Provides versatility to power various attachments
  • Eliminates belts, clutches, chains. shafts. and sprockets
  • Allows coordinating ground and attachment speeds to achieve maximum productivity

Propulsion system

  • Hydrostatic pump connected to a 2-speed motor
  • Motor control via high / low switch on the crowd control lever
  • Motor shift on-the-go feature
  • Motor drives 2-speed mechanical transmission
  • Combination of 4 operating speeds to match machine use and conditions (8.4 mph in transport)
  • Drive shafts connect transmission to front and rear axles
  • Planetary axles with torque proportioning limited slip differentials
  • Constant velocity u-joints provide smooth power flow to wheels in tight turns
  • Final reduction located at wheels to unload remainder of drive train
  • Small axle center-section leaves excellent ground clearance (9.8")
  • Front axle oscillates 20 degrees to allow wheels to stay in contact with ground in uneven terrain
  • Propulsion speed is controlled by foot pedal or crowd control lever located on righthand console
  • Foot pedal over crowd control setting with resume feature
  • Tires available:
    • 31x15.5x15, 8 ply standard and heavy duty
    • 35x19x16.1, 12-ply heavy duty

Brakes

  • Hydro-dynamic braking occurs while engine is running
  • Emergency / Parking brake is foot actuated -- hand lever release
  • Brake exceeds SAE qualifications for an emergency brake
  • Disc brake is located and protected within chassis
  • Disc and caliper brakes are mounted on transmission intermediate shaft to maximize on gear reduction out to wheels

Steering System

  • 4-wheel steering is standard
  • Front wheels are controlled with steering wheel
  • Most machine direction is controlled with front wheel steering
  • Rear wheels are positioned by control lever on righthand console
  • Indicator on righthand console shows rear wheel position
  • A hydraulic lock-check maintains rear wheel setting
  • Steering cylinders mounted above axles for protection
  • Front wheel steer provides a 35" outer diameter circle
  • Coordinated front and rear steer provides a tight 18' outer diameter circle
  • Coordinated steer allows smallest trench arc with least undercut
  • Rear steering allows operator to back a unit precisely into position
  • Crab steer is useful in countering side-slip on slopes, increased blade angle for backfilling, gaining additional plow offset. etc.

Hydraulic System

  • Tandem hydraulic pump driven by timing gears on front of engine
    • One section for steering flow
    • One section provides flow of accessory circuit
  • Combined flow of 19 gpm for hydraulic PTO, hydraborer, or backhoe
  • Hydraulic controls are located within easy reach of operator
  • Controls generally located on righthand console
  • Backfill blade control has all six functions in one control
  • Hydraulic oil cooler maintains optimum operating temperature
  • Hydraulic filters (2) to purify oil during operation
  • Hydraulic couplers installed to allow quick and easy testing
  • Hydraulic manifold at rear makes attachment installation easy

Electrical System

  • I2 volt system
  • 65 amp alternator
  • 2.5 kw starter
  • Warning lights and analog gauges monitor systems
  • Dual battery optional
  • Engine block heater for cold weather optional
  • Electric controlled ether start kit optional
  • Electrical accessory power for lights. etc., optional
  • Seat interlock system

Tool carrier chassis design

  • Unitized main frame absorbs shock loads from the most demanding applications
  • Protects the driveline components from obstructions and damage
  • Powertrain components can be removed individually
  • Mounting plate provides attachment installation flexibility
  • Removable access panels to allow easy access all areas of unit

Attachment Options

  • Trencher attachment with patented planetary chain drive
  • Hydrostatically driven by fixed displacement motor
  • Trencher speed is infinitely variable within range and reversible to dislodge chainline
  • Flywheel mounted to motor stores energy to power through tough spots and to protect hydrostat from shock loads
  • Torsion shaft between the flywheel and planetary drive absorbs chainline shock loads to reduce stress on drive components
  • Trencher chain drive spIit-sprocket makes replacement very easy
  • Sprocket & heavy duty rock booms with large end rollers
  • Trench boom lengths to attain 4', 5', and 6' dig depth
  • Cutting width set to trench 6” to 18” ditches
  • Heavy Duty A.B.F. 3.03 chains are available 
  • Cup teeth, Shark teeth, rock & frost, mixed cutters, and h-plate with rock and frost are available
  • Grease cylinder on boom-ends makes chainline adjustment easy
  • Dual open augers with double pitch flighting move spoil to both sides of trench
  • Personnel safety restraint bar is standard
  • Mechanical and hydraulic crumber attachment options available
  • Off-set bracket positions trencher to outside edge of tires

P95 vibratory cable plow capable of installations 30” deep

  • Parallelogram lift linkage maintains blade / chute angle while lifted out of ground to minimize potential for cable damage
  • Plow linkage allows loading unit without removing blade
  • Latch locks plow in transport position for safety
  • Blade vibration can be varied 0-2000 vibrations per minute
  • Counter-rotating weights inside gearbox generate plow vibration
  • Plow has hydraulic power lift, swing, and blade steer
  • Float feature in lift allows plow to follow ground contours
  • Plow has power-down feature to force blade into ground
  • Hydraulic swing allows plow positioning and float allows free-swing
  • Hydraulic blade steer will rudder blade to guide plow position
  • Blade steer used with boom and swing in float is normal operation
  • Maximum blade offset is 32.2" from centerline
  • 12" inside tire (outside edge) with wheels straight
  • 13" outside of tires with wheels crabbed
  • Plow skid shoes are standard with 2 position settings
  • Shoes mounted in narrow position allows plowing close to obstructions and reduces restoration
  • Shoes mounted in wide position allows trash to clear from blade
  • Blade mount has top pin cradle to allow easy blade installation
  • Blade installation is quick and easy with exclusive mount design
  • Blades with fixed or floating chutes are available
  • Also blades with bullets for pulling in semi-rigid materials
  • Sod cutter attachment to cut through trash is available

Quad allows trencher / plow combination option

  • One machine to complete installations
  • Selector valve directs hydrostat pump flow to attachment
  • Trencher limited to 5' boom length with 70 K chain and teeth
  • Heavy duty six-way backfill blade attachment
  • Single lever controls lift, angle, and tilt functions
  • Float position in lift allows blade to follow ground contours
  • Adjustable skid shoes on rear of blade reduces scalping
  • Blade lift height (15.4") allows 20 degree approach angle
  • Backfill blade swings 40 degrees right or left
  • Backfill blade angles 8 degrees up and down (16 degrees total)
  • Blade angle to ground remains same during swing
  • Blade will cut 5.9" below grade
  • Blade off-sets 11.3" outside edge of tire when angled
  • Blade has weld-on replaceable cutting edge
  • Blade angle guides have shim adjustment to allow for wear
  • Spill guard is available to increase blade capacity

HD125 over-center backhoe attachment

  • Equipped with 2-lever wobble stick controls
  • Front mounted backhoe with digging depth to 7' 5" and 11' 4" reach
  • Outrigger-type stabilizers provide machine stability with boom at side
  • Boom locks into over-center transport position for secure retention & to improve center of gravity to increase machine stability
  • Swing lock pin holds backhoe position when not in use
  • There are no transport chains to hook or remove after use
  • Walkway allows easy access to backhoe from operators platform
  • Operator's seat tips to prevent moisture collection
  • An emergency engine stop switch is located beside operator's seat
  • A throttle besides the operator's seat is available as an option
  • Single bucket pin mount provides superior bucket rotation for straight-wall digging and high digging force
  • Backhoe buckets are equipped with replaceable teeth

Reel carrier available to mount on front of machine

  • Accepts reels up to 1500 lbs with maximum of 42" width
  • Maximum reel diameter of 60" (48" with backfill blade)
  • Counter weight bar incorporated into reel carrier mounting
  • Reel carrier mounts with or without backfill blade

Hydra-borer for horizontal boring under obstructions

  • Hydraulic drive into gear reduction box
  • Stem rotation (272 rpm) is bi-directional (268 ft lbs torque)
  • Positioned to bore forward or rearward of machine
  • Mounting positions hydrabore in transport or operating position
  • Drill stems (10' length) and variety of bits / compactors / reamers to bore up to 6" diameter holes
  • Guide posts and level guide are available for safe operation

Accessories

  • 4-post ROPS 
  • Sun shade
  • Hydraulic PTO to power hand tools or other hydraulic equipment
  • Front counter weights for balancing machine
  • Front mounted loader

Please contact Astec Underground at
9600 Corporate Park Drive | Loudon, TN 37774-5584
Phone (865) 408-2100 | Toll Free (800) 527-6020 | Fax (865) 458-8575

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