Case IH MXM 190 delivers power that reaps results
The Case IH Maxxum Series of tractors have been built on a reputation for in-field performance. Facing the challenge head on, the MXM 190 does not disappoint. This 160 PTO hp tractor weighs in on the lighter side of the scale at 8.8 tons, but is heavy-duty enough for a variety of field work.
There have been similar platforms and engines used between corporate cousins New Holland and Case IH, and this tractor follows suit. Power for the MXM 190 comes from a 7.5-liter engine, which is also under the hood of the New Holland TM 190. The test unit delivered 174 PTO hp at rated speed and a maximum of 188 PTO hp at 1,950 rpm without power boost. The boost kicks in during PTO work and while working in gear 15 and up, which meant performance jumped to 194 hp and 216 hp, respectively. At maximum output, fuel consumption was reasonable—0.380 lb./hp/hr without boost and 0.403 lb./hp/hr with boost. Fuel consumption at rated speed was recorded at 0.406 lb./hp/hr without boost and 0.409 lb./hp/hr with boost. Operators will find that the 105-gal. fuel tank is large enough for a full day's work.
This tractor hits its stride when performing PTO operations with demanding applications.
Despite its stellar overall performance there are some features that the test team found fault with. For example, the throttle level has to be set at more than 1,000 rpm for the electric throttle to operate. The memory has to be reset with each restart of the tractor, and the memory buttons themselves aren't located in the most convenient spot on the B-post.
The transmission on the test tractor has 18F/6R speeds available and featured a top speed of 25 mph. Available as an option on the MXM 190 is a creeper speed transmission that provides an additional 10F/6R speeds.
There are seven speeds in the main working range of 2.5 mph to 7.5 mph. In reverse, the tractor has six speeds and a top travel speed of 7.5 mph. A rocker on the hand throttle makes shifting easy, and the powershuttle has been touted as one of the smoothest in the industry.
By simply pressing the activation switch for the transmission twice, the auto transmission starts in ninth gear, rather than 12th. This gives the tractor a transport boost to help pull away with a heavy load while in auto mode.
One downside of the auto mode operation on the MXM 190 is that the continuing link between shift timing and the foot throttle position/engine torque engage at the exact time of the function engagement. The tractor's response to downshifting during PTO work proved to be slower than desired. Time also lagged when shifting up to the previously engaged step after the shuttle had been placed back in neutral.
Two PTO speeds are available on the Case IH MXM 190: 540 rpm and 1,000 rpm. The PTO engagement system was basically new for Case IH at the time of the tractor test. One frustrating aspect of the PTO engagement system is that it deactivates when the operator moves off the seat, even if it is just for a moment. The system won't automatically switch off the PTO at the next headland, so the operator should pay attention to the activation light when learning the system.
- December 2009