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D-SERIES
EXCAVATOR CHANGES AND IMPROVEMENTS
The
D-Series Compact Excavators represent a completely new machine from the
ground up. Numerous changes have been made to increase productivity and
uptime, and reduce daily operating costs. This summary is provided to help
you familiarize yourself with these improvements.
PRODUCTIVITY AND PERFORMANCE IMPROVEMENTS
Engine
The
D-Series Compacts are equipped with new Yanmar direct-injection diesel
engines. These engines are similar to Yanmar engines used in other C&CE
and CWP applications. Therefore, many of the service parts are already in
the John Deere parts system, and the engines should be familiar to
dealership service technicians.
While the specifications show that the rated horsepower levels are
decreasing, the torque curves are higher and hydraulic horsepower remains
the same.
The engine displacement on the 50D has been increased from 2.179 L to
2.189 L.
The engine displacement on the 35D has been increased from 1.496 L to
1.642 L.
The engine displacement on the 27D has been increased from 1.496 L to
1.642 L.
The new engines meet EPA Tier-II emissions regulations.
500-hour oil-change interval maintained.
Performance
Cycle
times have been decreased 18% on the 27D, 5% on the 35D, and 7%on the 50D
compared to prior models. Faster cycle times allow operators to dig more
cubic yards per hour.
Productivity for the 35D is 5.5% greater than the 35C. Productivity for
the 50D is 11% greater than the 50C.
Drawbar pull (traction power) on the 27D has been increased 50%.
Drawbar pull (traction power) on the 35D has been increased 12%.
Drawbar pull (traction power) on the 50D has been increased 34%.
The 27D, 35D, and 50D feature automatic shifting from high-speed travel
to low-speed travel. When the speed-selector switch is in high, the
excavator will automatically shift to low when higher travel loads are
encountered.
The 35D and 50D feature auto-idle. If a machine function is not
activated for four seconds, the engine rpm will return to idle. As soon as
a lever is moved, the engine rpm will return to the preset level. The 27D
retains a cable-controlled throttle.
A new long-arm/heavier counterweight option provides an additional 12
inches of digging depth and reach. However, this option transforms the uni
from zero tail swing to reduced tail swing.
Operator
Comfort
A new
monitor is located in the front pillar of the cab or canopy. The new
location is easier to read. The new monitor features two trip meters that
can be set to remind operators when service is required.
ROPS/FOPS canopy and cab are featured.
Standard air-conditioning when the optional cab is selected.
The cab is 5 inches wider for increased comfort and better visibility.
The pilot control levers have been relocated 3.5 inches further apart.
The cab door access area has been increased for easier entry and exit.
A cup holder is standard.
The control pattern change valve has been relocated to under the
operators seat in a lockable compartment. A sight glass is provided to
view pattern selection.
Foot room has been increased with the relocation of the speed-selector
switch from the floor to the right-hand console and the addition of
foldable propel pedals.
Uptime
The
D-Series feature easily replaceable front hoses in the swing post
transition area. These hoses can be replaced without tilting the cab or
routing the hoses to the control valve.
A single-pin swing post improves the stiffness in the boom and arm.
The boom-cylinder guard has been strengthened to reduce the likelihood
of damage.
A redesigned undercarriage sheds dirt easily and reduces the time
required to clean the undercarriage.
The rubber tracks have been improved, with a harder rubber and
reshaped|core to resist cracking.
The drive sprocket and idler have increased in diameter to provide
additional durability and help reduce the chance of throwing a track.
Low Daily
Operating Costs
The
operators station tilts forward 50 degrees for easy access to the control
valve and front-side engine components.
All service checks can be done by opening just two doors.
The plastic side panels have been replaced with easily repairable steel
panels.
The 500-hour grease interval has been retained.
The 2,000-hour hydraulic oil-change interval has been retained. |