Help identifying a pump please

Gents,
The Tees Cottage pumping station in Darlington have restored a triple pump. It has fast and loose pullies at one end of the crank and a pair of cogs at the other end. As you can see from the picture the middle cylinder is cracked but it works well.
Unfortunately there is no makers plate or any other identification on the pump apart from on either side, cast into the block is  "N2  136LG" (the inverted commas are mine), hopefully someone can identify it,
There is just the one photo at the moment but I will be able to get more on Wednesday if needed. As a rough idea of size in the back ground is a Lister D and its carb.
Thanks in anticipation

It might be a Drake and Fletcher, what are the general sizes.

Maryalice

I'd say a Weeks?

Gents,
Thank you for your suggestions, I had toyed with a D&F but the ones I have seen on orchard sprayers have different big end connections and seem a 'lighter' build presumably to make them easier to move. Googling Weeks triple pump gets some unexpected results!!
I have attached more photos and these are the dimentions:-
The fast and loose pulley is 15" diameter, the cylinders are 3.5" diameter, not sure of the throw. The large gear on the crank is 17" diameter and the small one on the pulley shaft is 5" diameter. The pressure vessel is 21" tall and 5" diameter.

The sizes match the dimensions of the Drake and Fletcher I owned, wish I never sold it.

Maryalice

Can you remember the model by chance please, everything seems to be associated with orchard sprayer

No, just a three cylinder pump, will "try" to find pictures

Maryalice

Thanks