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FOCUS ON
PAVERS
January/February
2003 issue
Cedarapids
upgrades entire paver line
to meet Tier 2 emission compliance standards
A
total of 15 new mainline and commercial asphalt paver models have been
announced by Cedarapids Inc. that meet Tier 2 engine emission standards.
Fitted with a new, more powerful diesel engine, the new line includes
the 300, 400 and 500 model pavers. Model numbers within each series
will now end in a "2" to signify a Tier 2 engine. Also, within each
model grouping contractors have the choice between rubber tire, rubber
track and steel track drive systems. (See chart below for new model
designations.)
With a 20 to 40 per cent boost in horsepower
throughout the series, the new pavers are said to have ample power in
reserve for full-width paving while component upgrades allow for more
efficient operation. The standard Cummins QSB series engines in the
new Tier 2 pavers are designed to meet all EPA Tier 2, CARB Tier 2 and
Stage 2 (European) emission standards.
Along with emission-compliant engines and components improvements,
Cedarapids' new Tier 2 asphalt pavers bring a new look that includes
both Terex and Cedarapids logos.
A 24-valve, 6-cylinder design delivers a combination of improved airflow
and evenly dispersed fuel, resulting in increased power and less fuel
consumption, according to the manufacturer. Full authority electronic
controls provide more precise control over the engine's performance,
while an advanced diagnostics system alerts operators to engine problems.
Increased maintenance intervals of up to 500 hours on the QSB engines
improve machine uptime for more hot mix paving tonnage.
A revamped cooling system features a new single
width, triple element radiator that cools engine water, charge air and
hydraulic oil. Optimized airflow to each element ensures maximum cooling
efficiency. Integral to the hood, both sides of the new radiator are
easily accessible for cleaning. In addition, it is quickly removed from
the paver as a single unit for easier servicing. Hydraulically driven
by the engine's electronic control module (ECM), the variable speed
radiator fan runs only when necessary, reducing noise levels to the
operator's compartment. The ECM controlled Tier 2 fan uses less horsepower
thereby reducing fuel consumption.
With
the new Tier 2 pavers, cooling air is now drawn from above the hood,
rather from ground level, for cleaner air quality. The air is drawn
across the radiator, flows over the engine and exits the compartment
through the front grill and sides of the paver. This creates a positive
air pressures inside the engine compartment and reduces infiltration
of fine material, keeping a cleaner compartment and allowing the engines
to run cooler, states Cedarapids.
The company also says that the 38 per cent
larger hydraulic oil reservoir capacity significantly improves the system's
cooling capabilities and extends pump life on the new Tier 2 pavers.
Cedarapids' method of continuous hydraulic oil filtration is claimed
to capture particles as small as 5 microns.
Load bearing capacities for the 400 and 500
series Tier 2 rubber tire pavers have been increased by more than 40
per cent through improvements made to the front frame and pivot, kingpin
and wheel bearings. Now all new Cedarapids 400 and 500 machines are
capable of handling loads reaching 22.6 tonnes, delivering the extra
surge capacity needed with hopper inserts.
Advancements made to the front wheel drive
assist option offer higher torque and load capacity for all Cedarapids
Tier 2 rubber tire pavers. By incorporating a larger front wheel drive
motor, this new design increases the paver's tractive effort by 20 per
cent.
The new Tier 2 muffler system is custom-engineered
to work with Cedarapids' exclusive system of handling both engine exhaust
and asphalt vapours from the paver's fume recovery system. In addition
to significantly reducing noise levels around the operating environment,
the muffler is insulated on the outside to remain relatively cool on
the exterior, while keeping higher temperatures inside the exhaust stack.
These higher interior temperatures mitigate asphalt fumes drawn from
the screed area and discharge them along with engine exhaust.
The new pavers are equipped with larger fuel
tanks allowing them to complete a full day's operation without refuelling.
The rounded corners of the new pavers' hopper
wings improve material flow into the traditional slat conveyor or Remix
auger delivery system, helping to combat segregation by reducing the
build-up of larger, cooler material in the wing area. Reinforced to
handle heavier loads and sealed at the pivot points, the advanced hopper
wing is designed to provide reliable, long-term operation. Also now
sealed are passing points through the rear bulkhead. Sound insulating
material around hoses reduces noise levels to both screed and paver
operators. www.cedarapids.com
Multi-purpose
track paver now available from IR
The Blaw-Knox business unit of Ingersoll-Rand
recently added the PF-840 to its lineup of asphalt pavers. The new model
is a 5.4 tonne gravity-fed paver with folding hopper wings and a newly
designed discharge area. This design enhancement is claimed to give
the PF-840 unmatched material feed performance compared to other 2.4
m class machines and enables it to compete with much larger machines,
according to the manufacturer.
Blaw-Knox PF-840
A 38 hp Kubota water-cooled diesel engine combined with a two-speed
Sauer Sundstrand drive motor, gives the PF-840 variable speed control
from 0-33 m/min in low range and up to 67 m/min in high. Its positive
direct drive system and 49 to 1 gear reduction give the PF-840 power
to push trucks even on steep grades. The direct drive system includes
two independent variable speed, hydraulically-powered 380 mm x 1250
mm steel track systems.
The new model is equipped with a Blaw-Knox
381 mm deep Xtend-a-screed that goes from 2.4 m to 3.6 m wide. It has
two 1.2 m wide cut-off doors that allow the operator to pave from 1.2
m to 1.8 m without the use of any cut-offs or ditch plates.
Another business unit of IR has also introduced
a heavy-duty paver that can place all kinds of bituminous materials
up to 16 m wide. With a maximum lift depth of 260 mm, the ABG Titan
525 can reduce production time on major jobs such as runway construction
because it cuts the number of passes and labour necessary to complete
the job.
The European-built paver employs an integrated
digital control system called Electronic Paver Management (EPM). Developed
by Ingersoll-Rand, EPM uses state-of-the-art technology and modern paving
engineering to control paver output. Other features include an interface
for remote paver control, a data transfer system, reference wire steering
and an integrated levelling system. The paver features a 15.8-tonne
capacity material hopper, individual hydrostatic drives for each conveyor
and distributor auger and, hydraulic or mechanical auger height adjustment.
Travel drive is another added feature that
allows for uniform drive at varying tractive resistances. Track drive
also enhances the ride of the paver by producing a smooth and non-jolting
steering in curves at a constant speed. www.irco.com
New
Vogele paver offers higher speeds
The
new 880 RTB from Vogele America is a continuous rubber track paver that
features a 155 hp Tier II Cummins 6BTA turbocharged diesel engine, accurate
paving and travel speeds and heavy duty rubber-coated drive wheels,
idlers and bogie wheels for a smoother ride.
 Vogele
880 RTB
Power-actuated flow gates with material indicator
lights, proportional controlled feeders with sonic feed sensors, automatic
throttle and hydraulic adjustment of auger height from 114 mm to 241
mm are all standard on the 880 RTB. The Vogele fumes extraction system
provides a more comfortable working environment for the operators without
inhibiting their view of the auger and head of material while paving.
The 880 RTB is available with the following
three different screeds including the Pro-Pav Series ES 80B 2.44 m to
4.27 m screed with optional extensions to 5.18 m. The second screed
option is the Carlson EZ-IV 815, an all-electric screed for paving up
to 4.57 m, with optional extensions to 5.18 m. This screed has a 1.2
m extension on the right-hand side for true 1.2 m shoulder paving and
a .91 m extension on the left-hand side. The third available choice
is the FS 80B fixed screed, which can be equipped with .91 m x .91 m
hydraulic extensions, or Carlson's EZ II heated and vibrated hydraulic
extensions. www.wirtgenamerica.com
Caterpillar
releases new rubber-track paver
Caterpillar
Inc. has expanded its asphalt paver line with the recent introduction
of the AP-655C - a high production 2.44 m rubber track asphalt paver.
The new model has an operating weight of 18 503 kg and features Caterpillar's
Mobil-trac» undercarriage, on-demand variable speed cooling fan, 174
hp Caterpillar 3056E ATAAC diesel engine, independent material handling
system, improved service access and dual operator stations.
Cat AP-655C
The AP-655C utilizes a steering/propel controller
to provide precise propulsion and steering control. Speed sensors in
the track motors constantly provide information to the controller that
increases or decreases pump stroke to maintain or achieve the desired
response due to steering wheel position or speed lever position.
The Mobil-trac system is described by the manufacturer
as combining the traction and flotation benefits of a crawler undercarriage
with the mobility, speed and ride characteristics of a wheel-type paver.
The AP-655C uses a steering wheel to control
direction. According to Cat, the advantages are simplicity of operation
and improved speed control because the propel speed is independent of
steering commands.
The material handling system utilizes a controller
to precisely control the augers and feeders, and calibrate and monitor
the system to maintain the proper head of material in front of the screed.
Left and right augers are controlled independently.
Left and right feeders are also controlled independently, and the augers
and feeders are controlled independently of one another. Having the
ability to control these four systems separately eliminates the need
for feeder gates. Rather than raising or lowering gates to control material
volume, the feeder's speed can be set to provide the precise material
volume needed to the augers.
The engine cooling system incorporates an electronically
controlled on-demand variable-speed cooling fan that efficiently uses
engine power and reduces overall noise levels.
The AP-655C has two operator's stations that
can be moved into four different positions. The stations have fully-equipped
instrument consoles, adjustable, swing-out seats, armrests and seat
belts.
The AP-655C has been designed for easy and
quick servicing. Doors, panels and decks provide access to all service
areas. All hoses and wire harnesses are held in place with straps and
clips. A large swing-open door on the left side of the paver allows
easy access to the proportional-control valve for the left side tow
point cylinder, hydraulic pumps, and hydraulic filters. The right swing-open
door allows access to the radiator, hydraulic oil cooler, fuel filter,
and proportional-control valve for the right tow point cylinder. www.cat.com
New
front-mounted screed available
A
recent addition to Caterpillar's paving product line is the AS2251,
a hydraulically extendible screed that features front-mounted extenders.
The AS2551 has a paving width that ranges from 2.5 m to 4.4 m. The maximum
paving width can be expanded to 6.2 m with the optional bolt-on extensions.
The optional cut-off shoes provide a minimum paving width of 1.9 m.
Positioned at the front of the screed is a
pair of patented pre-strikeoff shields. The shields make first contact
with the mix after it passes through the augers.
The pre-strikeoff shields allow the proper
amount of material to enter the area in front of the main screed. The
pre-strikeoff shields follow the leading edge of the main screed, when
the thickness screws are used to adjust mat depth. These proportional
changes occur because the shields are attached to the drop arms with
mechanical linkages. When screed depth changes occur, the height of
the shield automatically changes. If manual adjustment is desired, handles
on the mechanical linkages allow the height to be fine tuned.
AS2251 screed
The centre of the main screed can have crown applied to it, allowing
the centre of the mat to be shaped either higher or lower than the ends.
Crown range is from +10 per cent to -3 per cent.
Two hydraulically driven extenders infinitely
vary the screed width within the paving range. The extenders are positioned
in front of the main screed and attached with a four-point, pivoting
structure.
The screed plate heating system consists of
four-low vapour, diesel fuel burners, two on the main screed and one
on each extender. A built-in timer allows 15 minutes of screed plate
heating and then automatically shuts off, preventing overheating of
the plates.
The main screed consoles, which contain all
electrically actuated controls, are mounted on each side of the screed.
All other operational controls are grouped near the main screed consoles.
Remote-mounted control boxes are positioned on the outboard surface
of each extender. www.cat.com
January/February
2003 issue
Aggregates
and Roadbuilding Magazine
4999 St Catherine Street West. Suite 315
Westmount, Quebec H3Z 1T3
Tel: (514) 487-9868 Fax: (514) 487-9276
EMail: rocktoroad@sympatico.ca
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