Can't find greasing location for universal joint on D7e 48A.

You might have to turn the u joints to find the zerk. As far as the final plugs. I believe it is a 3/4 bolt about 2in long with 2 nuts jambed and welded on the end will work just fine. I believe Cat still has them new for a price also.

The new plugs are 3/4" square. Should be a serial # plate on the dash near the lower right side above where the compression release lever would go.

There may be two plugs instead of grease nipples in the U/J, take them out, fit nipples, grease them and put the plugs back, do not over grease.

Am I wrong? That looks like a crack in the housing in the second pic.

Thanks for everyones help,i will crank the motor over a little to see if i can find the grease nipples or even plugs like you mentioned catsilver,the manual says there are two.Its not the easiest to get to,should i be looking at the knuckle ends or the centre,i'll have another look today.
The housing side is covered in thick grease where it looks like a crack,i'll scrape it away and see what it reveals.
The filler plugs have had a hard time over the years with not having the right tool for the job,i will see if Westrac can help me or might make the tool with bolt heads like you suggested kracked1.
There are two plates under the dash,they were covered in paint,think one is a caution advice,i'll have a closer look at the one nearer the compression lever and remove a bit more paint to see what it reveals.

That should be the plate just above the lever. The lever positions are to the right for "START" and to the left for "RUN". You should be able to turn the yoke by hand, the fittings should be between the universal yolks like it shows in the manual, not the center link. That lever looks out of position, it should be more straight up. Is it even working correctly? Ok, I see it is electric start, must just have a worn detent behind the dash. Then you would leave it to the left.

The drain plug number is 0L-0827 and gasket is 0L1124. Put the "open" side of the gasket towards the plug flange.

The drain plug number is 0L-0827 and gasket is 0L1124. Put the "open" side of the gasket towards the plug flange.

Thanks for the info Rome K/G,i had another look at the dozer today and found the 2 grease nipples by turning the uni joint,i was thinking of manual transmissions when i said i might have to crank it over,it turned easy by hand.So all grease points found.I still have to check the final drives and just happened to find a nut the same size as the filler plug hex,i will buy a bolt,weld it together and take the plugs out and buy 3/4" square plugs.
I had another look at the tags under the dash again,a fair few microns of paint rubbed away with thinners,(no scraping), found altitude information and warnings.My manual tells me only 2 serial number locations at the back and on the motor so i will have to rely on the information someone has written in the parts book.Thanks everyone for helping,
regards John.