From what I read of the specs on the unit that was purchased, I think you need more pressure and more flow to clean greasy equipment better. From what I've learned over the years, 4 GPM @ 4K psi is a good choice. You can always turn the pressure down for sensitive areas. A good degreaser like Citrol will break down the chemicals for faster removal and cleaner results.
I run a large hot water unit that heats to 180 F and 4 GPM @ 4000 psi which works well most of the time. Pretty much the same as this unit listed on the web. Not a high priced unit but works good for hours at a time.
If it is really greasy, I skip heating the hot water and run the discharge through the "Hot Box" that produces steam. Can't see much with steam on a colder day but it surely cleans off heavy grease/oil residue much quicker. My truck's PTO mounted pressure washer is cold water only but I can also run that through the hot box when I need steam on a site. It has a variable temp control so it's anything from warm water to blistering 230 F steam.