Oh, dude, to add hydraulic fluid to a New Holland 545D tractor, you'll want to locate the hydraulic reservoir, which is usually near the back of the tractor. Just pop open the cap, pour in the hydraulic fluid until it reaches the proper level, and voila! You're good to go, like, ready to tackle those farm chores with hydraulic finesse.
right beneath the oil filter. There is a blue wire attaching to it.
The Ford 545 C Tractor -- serial number withC would manufactred between the years of 1990 and 1991 , replaced by the 545D model in 1994 - 2000