There is a cap right next to the gear shifters. It's about 1-3/4" dia or so with a hex head on top. The hydraulics share the same fluid as the transmission.
Filter is inside the tank.
The power steering can not be adjusted on a Massey Ferguson 165 tractor. Check to make sure the hydraulic reservoir is full. This is usually the cause of most steering issues.
To change the hydraulic fluid filter in a Massey Ferguson 165, first, ensure the tractor is turned off and is on a flat surface. Locate the hydraulic filter, typically found near the rear of the tractor, and place a drain pan beneath it to catch any spilled fluid. Unscrew the old filter using an appropriate tool, apply a thin layer of new hydraulic fluid to the rubber gasket of the new filter, and install the new filter by hand until snug. Finally, refill the hydraulic system with the recommended fluid and check for leaks.
What year is a massey ferguson 165 with a serial number of 37786240?
To drain the hydraulic fluid from a Massey Ferguson 165, locate the drain plug on the bottom of the hydraulic oil reservoir, which is typically found on the left side of the tractor. Before draining, ensure the tractor is on a level surface and the engine is off. Remove the drain plug and allow the fluid to completely drain into a suitable container. After draining, replace the plug securely before refilling with new hydraulic fluid.
a 165 Massey-ferguson oil pan holds 8 1/2 quarts
1974 http://www.tractordata.com/farm-tractors/000/7/4/746-massey-ferguson-165.html
1973
1971
in the oil filler hole
1974
that would be 1968