My Longstaff Cyclon "MTB" trike doesn't have grease nipples either.
I tried mountain triking but the one wheel drive didn't help & I got stuck frequently .
I've put Nimbus slicks on which are better for our local rural roads. I still have hairy moments cornering fast, but have kept out of hedges for nearly a year now.
I still want to extract the MTB frame & use the conversion on a lighter frame without front suspension. LBS says I should take it to a specialist, but no-one replies. How do I get a wheel off without losing the vital bits from the hub? Do I just unscrew the allen headed bolt in the middle of the hub, what keeps the wheels on? Secrets of the black art of tricycling.....