Threading an elbow onto the hydraulic fill might be a thought of genius. Of course, finding that elbow... I just bought a funnel with a flexible insert yesterday, which I think will solve the problem.
A couple of other issues - I'm using it a lot now, so I have a lot of time to contemplate... The hydraulic hoses had enough slack in them that they tended to rest on the extremely hot muffler. I'm pretty sure that was going to cause problems one day - solution, 3 cable ties tying them together, so they support themselves well off the muffler.
Other modifications I'd like to make are making a cradle of sorts so the log doesn't have to be held in place - this would have to be mounted on the bottom of the I beam. I just saw this on a Yard machines. I'd also like to mount some sort of bumper beam around the engine, so logs can't fall on it, and so I don't accidentally bump up against the muffler
Also, I'd like to rig a long enough handle that I don't have to stand next to the muffler while cutting. The yard machines splitter had what looks like the same system as HF, but reversed so the handle was closer to the splitting area. Just flipping the HF assembly might be the easiest.
Re the muffler exhaust - the port on mine could be angled by removing and putting the screws in different holes - I now have the exhaust firing down and a little forward, which is nice. There is a spark arrester.
Other thoughts on checking out the YM splitter at Home depot ($1300+) against the HF machine. YM splitter had a bunch of the tweaks mentioned above already done - looked like the same design updated. Engine was a 5hp honda compared to my HF 9
hp subaru. Much more steel in the HF splitter - the design philosophy seemed to be spare no I beam. YM splitter only had an I beam under log, rest was 2" square tubing. So lighter all around. Hitch of the YM was at a much less PITA height.
All in all, the YM had the nice design modifications, but the HF was much better/heftier built, and cheaper. I was pleased to see this.
I find Briggs engines to be loud and lousy - great for keeping mechanics in business. The general quality of the subaru just kills it. And the 9hp subaru is quieter than a 5
hp briggs.