Last year I mentioned my happiness with the Oster Classic 76 clippers. One of the attributes I called out was its serviceability. Today, after five years of personal use, I decided it was time to remove the faceplate, clean the innards, and replace the grease. I followed the instructions in Oster’s maintenance video (which appears to be straight out of 1998). It’s a simple process. I only cut my hair once every 4-8 weeks, so I suspect performing the deep cleaning every five years is about the right schedule. I lubricate the blade every 3 or 4 uses.
No special tools were needed. Something pokey and scrapey is helpful for cleaning out the small crevices. I used a titanium Norton Universal Cleaning Stick because I had it close to hand, but a flathead screwdriver would work just as well. All parts appear to be in excellent condition, and when reassembled the clippers pur like an angry kitten.