From: Wayne Harris (papercu@hotmail.com)
Date: Sat Feb 14 2004 - 13:10:25 PST
Info from the -386-10. Wayne
(1) Engine is a Caterpillar 3116 Air-to-Air After Cooler (ATAAC) diesel, 170
HP, 420 lb-ft (570 N•m), designed to meet or exceed performance requirements
of the 2-1/2-ton ESP vehicle.
(2) Automatic transmission is an Allison AT-1545P, 4-speed, which shifts
automatically in all forward ranges and requires no operator action
uncommon to standard automatic transmission.
(3) Transfer case is a Rockwell T-136, 2-speed, which in conjunction with
the
transmission, provides up to 8 forward and 2 rearward speed ranges to
front and rear differentials.
(4) Front and rear axles are Rockwell C-240.
(5) Wheels are two-piece Motorwheel 20 x 11.00.
(6) Tires are Michelin 14.5 R20XL tubeless radials with a minimum life of
10,000 miles (16,090 km).
(7) Power assist steering cylinder and drag link are manufactured by Sycon.
(8) Central Tire Inflation System (CTIS), designed by CM Automotive
Systems, allows the truck operator to monitor and regulate tire pressure
from driver’s compartment before and during vehicle operation.
(9) Air cleaner element has a capacity of 26.9 hours at 580 cfm (16 m3/min)
and is manufactured by Nelson.
2. ENGINE
Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . .
Caterpillar
Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3116
ATAAC
Type . . . . . Diesel, four-cycle, in-line 6 cylinder, turbocharged
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1,198 lb 544 kg
Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . 403 cu.
in. 6.6 L
Operating Speed (Full Load) . . . . . . . . . . . . . . . . 2,700 RPM
Brake Horsepower . . . . . . . . . . . . . . . . . . . . . . . . . . 170 HP
Maximum Torque (@ 1,550 RPM) . . . . . . . . . . . . . . . 420 lb-ft 570 N•m
Oil Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35-70
psi 241-483 km/L
Compression Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18:1
Fuel Consumption (Approx.) . . . . . . . . . . . . . . . . . . . 7-8 mpg
3-3.4 km/
The CTIS allows the operator to manually select a tire pressure suitable to
the
terrain being traversed. The system incorporates an Electronic Control Unit
(ECU)
and air regulating system which provides and maintains the correct air
pressure to
all tires at the same time. The ECU controls the manifold, which
automatically
directs compressed air to inflate the tires, or signals the deflation port
to deflate the
tires according to the operator-selected terrain setting. The ECU monitors
and regulates
air system pressure in 30-minute intervals and compensates for thermal tire
pressure changes as recommended by the tire manufacturer.The CTIS is
activated and deactivated with an ON/OFF button on the ECU. In
the event the unit is not deactivated prior to engine shutdown, it will
automatically
activate when the engine is started again.
Terrain switches on the ECU are pressed by the operator for the terrain
conditions,
which are identified as emergency, sand/mud/snow, cross-country, and
highway.
Once the terrain switch has been pressed for desired pressure setting, the
air
system inflates and maintains all tires to the appropriate tire pressure
corresponding
to a recommended vehicle speed. Provided operator does not experience
overspeed
conditions, no additional operator inputs are required once presets have
been
selected.
The air regulating system consists of a controller overspeed signal
generator,
power manifold, and wheel valves. If the operator exceeds the recommended
vehicle
speed in either emergency, sand/mud/snow, or cross-country modes, an
overspeed
warning will activate, (flashing max speed display) alerting the operator of
the overspeed
condition and to signal operator to either decrease vehicle speed or select
a
higher tire pressure on the ECU. In the event the operator fails to slow
down or
select a higher tire pressure in approximately one minute, the system will
automatically
increase air pressure to the tires to the next higher tire pressure setting.
In the event of one or more small air leaks anywhere in the system, such as
from a
tire puncture or leak at a connecting line, pressure can be maintained by
pressing a
terrain switch on the control panel. When doing so the initial test pressure
sequence
begins. If the air feeder lines cannot hold at least 6 psi (41 kPa) the
controller display
will read FLAT in the upper right corner, indicating to the vehicle operator
that a
large air leak, such as a damaged/disconnected air line or a flat tire,
exists. When
FLAT is indicated, the vehicle operator may elect to call for assistance, or
try to drive
to a repair center using the vehicle’s run flat mode.
Should a particular tire or connecting line experience catastrophic failure
or a
leak which exceeds the capacity of the compressor, the CTIS may be turned
off,
allowing the wheel valves to keep each tire individually isolated.
Additionally, the
damaged portion will remain isolated, as a safety measure, until it is
repaired. A
priority pressure switch in the manifold monitors the pressure in the air
reservoirs
and isolates the CTIS if this pressure drops below 75 psi (517 kPa). Minimum
requirement for the operation of priority systems (brakes, power steering
assist,
horn) is less than 75 psi (517 kPa), so safe operation is assured. If the
CTIS suffers complete
failure, the operator accesses a manual wheel valve at each wheel and
inflates
each tire from an external air source. If tire pressure falls below 10 psi
(69 kPa), CTIS
will not inflate tire. The CTIS should be deactivated during operation in
extreme cold,
0° to -65°F (-18° to -54°C). Extremely cold temperatures can cause air seals
located at
each wheel to fail.
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