By The Numbers: The Cat D4 Dozers Data


By the Numbers: The Cat D4 Dozers Data

The Cat D$ Dozers Data tell the tale. . . and as they say, numbers don't lie. This little bulldozer with the long reputation has always had the power and durability you might expect in a much larger, full dozer, while giving you all the maneuverability of a mini.

Check out the CAT D4 Dozers data:

* It has 44, 60-inch tracks

* Its draw bar is 50 hp [37.3 kW]

* Its bore / stroke is 4.50x5.50 inches [114 x 140 mm]

* It operates on 4 cylinders

* It has a displacement of 350 ci [5.7 L]

* Its torque is 421 lb-ft [570.9 Nm]; it has a 1000 RPM torque

* The transmission has 5 forward gears and a reverse.

Efficient, agile and yet spunky: That's the best way to describe the D4.

For those not familiar wit it, the Caterpillar D4 is a small or mini bulldozer produced by Caterpillar Inc. Its history goes back to the RD$, which Caterpillar introduced in 1938. This was the diesel follow-up to its previous successful gas model, the CAT30. At the time, the RD4 came with a D4400 engine.

In 1935, the company began naming convention that said R was for regular gasoline and RD was for diesel. Later, this was amended so that just a "D" was used for diesel. And so the RD4 became just the D4.

Back then, the engine for the D4 produced around 43 horsepower at its draw bar. That's where the 4 comes from in the name. . . from the 43. Caterpillar outfitted their new D4 U series with the also-new D315 engine. These engines increased in power quickly, so eventually the number after the "D" just became a figure to differentiate one from the other, rather than a number that described the engine power.

The history and the numbers behind the CAT D4 are impressive, but what really made them memorable is their durability. The D4 was made mostly of cast iron, so even when you ran one up a steep hill, if it turned over, it was almost impossible to hurt one of them. In fact, many competitors that popped up about the same time as the D4 might have been (and were) designed in such a way that a turn-over was likely. Nevertheless, they tended to have shorter lifespans because when something did happen to one, they were rendered useless. Not so with the D4. It was designed to be durable, and durable it was and is.

In fact, the CAT D3 was known for the same kind of durability, but it tended to be used for slightly different purposes. The D4, due to its smaller size, was perfect for farm applications, whereas the D3 always seemed more useful for building purposes.

So what about today? Can a bulldozer with such a long history still be useful for today? Amazingly, yes! If you keep your eyes open on various online sites, you can find parts to fix up one of these magnificent machines and have it back in operable condition. As an example, one auction site recently had a used c15 caterpillar motor for less than $11,000. That's far less than you'd spend to buy a new dozer.

Numbers don't lie--and the The Cat D4 Dozers Data shows just why the D4's performance is so fondly recalled.