I twisted the shaft of my nylon strap wrench like a pretzel trying to change the filters on my neighbour's CK27 even though it worked fine when I did my DK35 a few years earlier. I got a Channellock filter plier:
https://www.channellock.com/212-Oil-Filter-PVC-Plier.aspx
I think it works better than the strap wrench. They are available on Amazon in 9, 12 and 15" sizes. I got the 12" which worked fine on my neighbour's very tight filters. It also fits all the filters on my DK from the small engine filter to the large HST filter.
I changed my oil, etc. at 50 hrs and then at the specified intervals from that. e.g. at 150, 250, 450, etc.
The CK maintenance chart is different than the DK series in that the CK seems to suggest changing engine oil at 100 hr intervals and the filter every 2nd oil change (i.e. 200 hr intervals).
My DK manual's chart only shows "Engine oil" being changed at 100 hr intervals (does not mention the filter on the chart). However, further along in the manual under service item "L" there is a note: "The engine oil filter should be replaced when changing the engine oil."
Although your chart specifies changing oil every 100 hrs and filter every 200 hrs you might find a note in the manual saying something different. The engine oil filter is cheap so I'd be inclined to change it every oil change.
I notice the CK specifies 400 hrs for changing the transmission/hydraulic fluid. The DK is the same but on the advice of my dealer I did not change mine (after the initial 50 hr change) until around 700 hrs after the initial 50 hr change. I do change all filters as specified.
Checking all bolt torques is important. The DK loader says to check it every 25 hrs and I noticed they needed tightening the first few times. My dealer recommended blue Loctite on the large loader frame mounting bolts and they have never moved since. I also noticed slight movement on the wheel bolts until they settled in.