Hi,
I don`t think there is. If you want to make your bearings last along time try putting grease nipples on each wheel, I use Straight nipple 6mm dia. x 1mm thread drill hole angled to come out just behind bearing to fit a grease gun on. Remove both the inner seals of the bearings , pack the area between the bearing spacer with grease.
You then only need a couple of pumps with a grease gun (don`t use a lever type gun they clip over the grease nipple to tight), but a small hand pump type) to fill back up with grease after a buggy session to replace any lost grease that comes out.
Important not to put to much in.
I always clean the out side of the bearing off after a buggy session and lightly grease the out side to stop the bearings rusting near the seals which will damage them. I also put washers next to the bearing when bolting the wheels this stops sand getting near the inner diameter of the bearing where it rubs on the seal.
This works very well and bearings lasts a long time
Dave A