Knowhow-Now Article

Caterpillar D Series

The CAT (Caterpillar) 420D and 430D backhoe loaders are the high performance machines in the D series lineup. The 420D boasts 85 HP
and a backhoe digging depth of 14 feet when equipped with a standard stick.

The 430D offers 94 HP and a backhoe digging depth of 15 feet when it is equipped with a standard stick. By using an extendible stick,
you can push the digging depth of the 420D to 18 feet and the depth of the 430D to 19 feet, which is very impressive to say the least.

Both D series machines are available in IT (Integrated Toolcarrier) configurations for applications that benefit from a parallel lift
loader linkage and the versatility of quick work tool changes through the use of a versatile hydraulic quick coupler. Applications
include the use of pallet forks, material handling arms, brooms, and even buckets.

The new and improved pilot operated hydraulic backhoe and IT loader controls will help to ensure smooth, precise operation with
reduced effort on behalf of the operator. These backhoes use excavator type joystick controls, and an optional pattern change valve
which allows you to select the patern of control.

The 205 degree rotation that is offered by the backhoe bucket linkage will make it easier to dig vertical walls and clamp material
when loading trucks. The rotation with the D series is 40 degrees more than with the C series. Now, the backhoe buckets feature a
single pin position, with the bucket link featuring an integrated lifting eye as well.

The optional quick coupler you can get for the backhoe will allow fast changes of working tools for increased versatility and
flexibility in almost all applications.

Both of the D series backhoe loaders use the turbocharged, direct injection, four cylinder diesel engine, with a displacement of 4.0
liters. This engine offers superior lug performance which is mostly due to the responsive fuel injection system.

The standard power shuttle transmission provides four forward speeds and four speeds in reverse as well. Fully synchromesh in all
gears will permit on the go shifting, while the forward and reverse electric power shuttle will provide instant direction changes
through powered clutches.

The auto shifting feature will automatically shift between second gear and the highest gear selected for ease of operation. The auto
shift feature has five forward and three reverse gears, with a transmission kick switch on the lever of the loader control.

With D series loaders, you'll also have the choice of standard two wheel drive or all wheel drive, which you can engage easily on the
go, under heavy load, by pressing a switch that is located on the front console.

The D series loaders from CAT are very fast and versatile as well, as they will move faster than most types of backhoes on the market.
The diesel engines are very fast, while the machine has enough traction and control to keep you moving even in wet or muddy
conditions.

The variable load sensing hydraulic system will adjust the flow and pressure of the machine to meet the demands of work with an
increased pressure of 3,300 PSI. The hydraulic system is tuned to work efficiently with the engine, and it provides full hydraulic
force to the working tool on hand at any engine speed you desire.

Unlike other backhoe loaders, the D series will reduce demands on the operator, cut fuel consumption in half, reduce wear on the
engine, and allow for quieter operation. To make a long story short - the D series from CAT are among the best backhoe loaders that
money can buy - bar none.

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