The valve stack has quite a complex arrangement with a lot going on despite its size. An explanation of the the valves and their functions is therefore posted beside them so during fault finding the problem can either be found or ruled out quicker. You still need the manuals for the full hydraulic diagrams but hopefully the visual diagram means people are at least looking at the right thing. Especially useful if someone wants to try to move something manually.
As simple as it gets - the arrow shows quickly what direction the motor / pump should be turning especially useful on first start up after a wiring, electrical component or motor change. We have all seen a motor run in the wrong direction at some point with the results that follow especially if there is an electrical technician doing the work who is not familiar with hydraulic pumps.
I have found the best place to mount the arrow is on the bell housing as it most likely stays for the life of the machine. Motors and pumps can get changed out so any arrows placed on them disappear with the changed out component.
The tank sight glass marked up to show where an acceptable level is allowed and what point the low level alarm and cut out kicks in. The technicains and operators know that they do not need to top up until the oil gets close to the bottom of the green band. Previously they either were topping up too regularly is the system was losing oil through small leaks or they assumed that as long as there was oil in the sight glass it would be ok. An oil level close to the bottom of the sight glass kicks in the minimum level alarm and then the low level machine stop.
