Our power shears work really hard from mid-season pruning to fall, when cedar pruning begins. The days are busy and it's very tempting to pack up and go home; or just return your power shears to your garage. But I suggest taking the time to lubricate your blades after every use.
Lubrication is especially important on rainy days. Take your professional lubricant and spray your blades liberally. WD40 might be OK if nothing else is available but it doesn't last as long.
The blades will be cleaned and they will run better next time you use them. I recommend the Stihl lubricant because it also does some cleaning at the same time. So get a bottle from your nearest dealer and keep it handy.
Vas Sladek, B.Sc., CLHT