There was a compression release on the engine as well, but letting the engine spin over and generate heat from compression with no injection was a good way to warm it up. Not only that, you could engage the clutch and spin the diesel over for as long as it took to warm it up, before engaging the injection pump and letting the diesel take over. The pony engine was plumbed into the cooling system of the tractor so, when running, it put some heat into the engine. In the days when batteries were weak, unreliable and diesels were very hard to start, the pony engine made a lot of sense. The pony engine came standard with a rope start but a 6-volt starter/generator was optional. You can see one cylinder head at the back of the engine. The D3400 was most often started by a 35.6 ci, 2-cylinder horizontally opposed gas pony engine making 10 hp at 3000 rpm. The Cat injection pump is larger than a Geo Metro engine and certainly heavier. It was introduced in 1938 and was built into 1947. The D3400 diesel was a burley brute, even if it only displaced 221 cubic inches. The round thing on the firewall is the rope-start flywheel on the pony motor. The short lever by the seat engages the rear PTO. In the center, up high, mounted to the gasoline tank for the pony engine, is the engine speed control. The two foot pedals are the steering brakes, which can be used in conjunction with the corresponding steering lever for turning. The two steering levers declutch the tracks left or right. The lever on the far left is the hand clutch. The operator’s station is a forest of levers.
Caterpillar d2 dozer spcs full#
The area behind the seat is the 20 gallon fuel tank, which was enough for a full day of hard work. Ditto the optional PTO, which was used for everything from agricultural implements to winches. The standard swinging drawbar was useful in agriculture and excavation. A small diesel crawler didn’t come from Cat until 1938 in the form of the D2.
One of the first new designs to come after the Holt/Best merger was the Caterpillar 10 of 1928, a compact crawler delivering 18.1 PTO hp from a 143 ci gas engine. The crawler gained the most favor on larger acreages out West and on the soft ground of the fertile Central Valley of California. In the days of small farms and small tractors, small diesel crawlers also had a following in the ag world.
By they end of the 1930s, Cat had a vast array of diesel-powered crawlers, as well as a large line of diesel engines for industry of all types. A diesel powerplant was one of their earliest priorities and the D9900 diesel debuted in 1931 powering the legendary Caterpillar Model 60 (see Diesel World, July 2008 issue). Best were individually among the pioneers in the crawler realm when they merged in 1925 to form the Caterpillar Tractor Company. Crawlers could put more power into traction with less ground pressure than anything else. In the early days of motorized farming, crawler tractors had a big part to play in some parts of the country.
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