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TAS Country : November 18th 2010
Friday, November 19, 2010 Tasmanian Country 11 POWERFUL DISPLAY: The Comfort King pulls a harvester. LOOKING GOOD: The Comfort King was a superb-looking tractor. case ''9'' for tractor model line, ''3'' for diesel power and ''0'' for standard tread, while a 940 would mean you had an LP gas-powered version of the same basic standard-tread tractor. If getting the head around all these model codes was somewhat confusing, it was going to get a lot worse as Case tried to broaden the appeal of the 930 series through further variants. While the LP gas powered engine continued with the same 377 cubic inch displacement as in the previous model 910B, it got a horsepower boost through raising the operating revs to 1600 for a rated 83-engine horsepower at the belt pulley. That made for impressive horsepower figures in 1960, but the LP gas-powered tractor was not a machine of beauty -- the transverse-mounted gas tank at the rear of the bonnet (as it was also on the model 910B) ruined the graceful lines of the bodywork and did absolutely nothing for the tractors looks. Of course, you were not buying an LP gas- powered Case for looks. Many farmers still liked the responsiveness of a spark ignition engine, it was a clean-burning fuel, extremely cheap to buy (especially if you farmed in an area where there was a gasoline refinery), and the need for pressurised handling equipment for LP gas meant you were not likely to have your bulk fuel tank siphoned by thieves. Naturally though, LP gas sales would only appeal to a very small market now that diesel was proving to be the way of the future for economical large-displacement, high-horsepower engines, and in the model 930, this meant the release of the biggest Case diesel tractor engine to date. Case increased the size of the cylinder bore to 41G8 inches, with the previous piston stroke of five inches, to give 401 cubic inch displacement. Like the LP gas model, engine revs were increased up to 1600 revs per minute, and through its extra displacement, the big diesel managed to match the 83-belt horsepower rating of the LP gas engine. Inside, both spark ignition and diesel engines shared many common build features. Engine blocks used wet type cylinder liners to cut down on expensive rebores in the event of cylinder wear, seven main bearing induction hardened crankshafts were used, along with the multiple cylinder heads that first appeared on the Case model 500 back in 1953. The inline fuel injection pump and Lanova energy cell combustion was retained from the model 900B diesel, while the model 940 LP gas model made use of a pressure regulator and carburettor supplied by the Ensign Company with both model variants using the tried and tested oil bath type air cleaner. While the diesel engine got a sizeable boost in displacement, the transmission went untouched, with the six-speed unit carried on from the earlier tractors along with that venerable old chain final drive, which was still taking the higher horsepower ratings without any real problems. For the first time on a Case tractor, you could now option a 540/1000 revs per minute independent power take-off drive for even more all-around adaptability. Case had been one of the first manufacturers to use wet type disc brakes on the high-speed differential shaft in its tractors and these were carried through to the diesel models 500, 600, 900B and now on to the model 930. However, one thing that was on borrowed time was the old hand clutch. Over the years, the oil- cushioned single plate over centre hand-operated clutch had been simple and easy to adjust, but the rising horsepower levels were starting to see this type of clutch at its effective operating limits. I once spoke to a visitor to our museum from Canada who told me he had installed GM 6-71 diesel conversions into the old kerosene Case model LA tractors, but the clutch was always the weak link in delivering the horsepower -- the rear end was fine. Obviously Case knew the limitations of the hand clutch, and in 1964 offered a foot clutch on new variants for row crop work known as the models 931 and 941. As with previous models, the new model number gave a code as to the identity of the tractor --- ''9'' was for the tractor series, ''3'' was for diesel power (a ''4'' was spark ignition) and the ''1'' identified adjustable front end for row crop work. Having the foot clutch changed the look of theses new Case variants from the standard-tread 930 models as the operator position was moved forward on top of the transmission housing and the fuel tank relocated behind the operator not only for more room, but greater capacity. The batteries that had previously been located at the front of each rear mudguard were now situated on a platform either side of the tractor below the fuel tank. Mounting the tractor was now done from either side via two steps, while the standard-tread tractors with their hand clutch were still accessed from the rear. Unfortunately, in its haste to get a high- horsepower row crop tractor on to the market, Case mated the 930 range diesel and spark ignition engines to the all gear drive transmission that had started life back with the model 400 and carried through to the 830 range -- those tractors were four- cylinder models and the big six-cylinder engines of the 930 range were going to severely test things. While chain drive was old-fashioned, it was inherently strong -- a set of gears will only have a few teeth in constant contact at any time while a chain wraps at least halfway around a gear sprocket, giving far more surface area to take the horsepower being delivered through it. Unfortunately the carryover of the 830 transmission was a decision based on cost. J.I. Case was going through a hard time financially and the pressure was on the engineers to do as much as possible with as little expenditure as they could. Transmission problems aside, the general- purpose row crop model 931/941 tractors were well-liked for power and operator convenience and pointed to the direction the rest of the standard range would soon follow. For 1965 Case adopted a new name for its tractors with their relocated driving position and rear-mounted fuel tanks -- the Comfort King range. With minimum cost outlay, J.I. Case had ensured that the tractors still looked up-to-date despite the panel styling dating back to 1957. The air cleaner was moved to a new position inside the nose panel with the intake stack raised above the bonnet line with a pre-cleaner bowl on top. Even so, you could still have the good old hand-operated clutch as an option on your Comfort King if you wanted. The standard tread or wheatland version of the 930 Comfort King was a superb-looking tractor -- with oversized 23.1 x 26-inch rear tyres under full- width rounded rear mudguards it looked a real powerhouse. Continued next week PERFORMANCE CORRIEDALE'S Quamby Plains Monday 22nd November 11am start 35 RAMS FOR AUCTION 2008 + 2010 Supreme Wool Breed Ram @ Campbelltown Show Contact: Richard Archer Ph 03 6392 2322 Mob 0438 922 321 2000289-101119 Quamby Plains Can -- produce lambs high growth rate high value skins high yielding carcases
November 11th 2010
November 25th 2010