The t4a T6.175 are 6cylinder, so are the T6.155 and T6.165. Then when the T4b models came out the 180 became the only 6cyl until they brought out the 160 a couple years later
Didn’t need it, 956xl pulled it out no bother. That’s why I like to use a wee tractor on most of our ground, easy to pull out when this happens, not so easy to pull a 4 or 5 ton 4wd tractor out