Husqvarna PG 680 Operator's Manual page 26

The effectiveness of the planetary seal can be moni-
tored by the simple removal of the planetary motor
/ gearbox system by removing the four bolts shown
below.
If the planetary seal is working effectively, there should
be a very minimal amount of dust observed under
the cover of the machine. If there is a build-up of 5-
6mm (1/4 inch), then it is more than likely it is time to
remove the machine cover and check the condition of
the planetary seal.
26
- English
Maintenance
Remove 2 bolts either
side.
Inspect for dust build
up here
Remove this bolt.
Lift off machine cover to reveal chain ring and planetary
seal.
If planetary seal is worn or needs replacement, contact
your Husqvarna Construction Products distributor for a
new planetary seal replacement kit.
Remove 2 bolts either
side.
Remove this bolt.
Remove cover off motor
terminal box.
Remove these bolts.