Where do you check hydraulic fluid on a Massey Ferguson 399 with hi-line cab?

To check the hydraulic fluid on a Massey Ferguson 399 with a hi-line cab, locate the hydraulic reservoir, which is typically found under the left side of the cab. Use the dipstick attached to the cap to check the fluid level; it should be within the marked range. Ensure the tractor is on level ground and that the engine is off for an accurate reading. If necessary, top off the fluid with the appropriate type specified in the owner's manual.