RC4WD 4200XL models and nomenclature?

[TheBennyB]

Ok, i've been reading all kinds of posts on this and other forums and have some questions. This is my first hydraulic r/c so please be patient on my novice questions if you don't mind. This all may be on me but it seems there are some discrepancies on models and equipment. I supposedly have the version 1.5 but have read some have a 4th servo for a "spillage valve?" Mine only has 3 servo's for the booms and bucket. The rotary knob above the left stick does nothing, neither does switching the 3 pos switch above the right stick off of N. My serial number is on the under carriage not in the operators cabin. The endpoint for the pump motor is set at 30% from factory. My lights have the exterior switch and can't be turned on via TX. Also mine came with spring loaded idler wheels. How does this compare to other newly acquired version 1.5's I was wondering? Also, 30% on the pump motor seems a bit high. What are the rest of you running at? Thanks for any input.