D4400 lube and fuel filters

Depends on what you have and if it is correct for the serial numbers.
Several filter evoltions occurred for the D4400/D4600.

My power unit engine..serial number 1S4877.
Direct electric start.
Kind of high output at 51 horsepower at 1650 rpm no load and 1550 full load.
Others i have read about are a bit less.
not sure of the year.
Has the large injectors with the single threaded retainer.
The fuel filters (4 of them) look like socks mounted to a plate under the cover.
Does the fuel go into the center of each filter and then up to the top where it then goes to the injection system ?
Im a small engine gas guy (millwright by trade).Not sure how i got into small gas stuff cause this Cat is so much better.
However the Cat thing is a bit off my scale.
But im learning every day thanks to you folks.
Thanks Chris