Hiitachi UHO-83 Swing MotorIhave an Hitachi UHO-83

I have an Hitachi UHO-83 with a swing motor problem, in that it turns to the left ok but is very slow turning right, would anyone have any ideas as to why this would happen? thank you.

Hiitachi UHO-83 Swing MotorIhave an Hitachi UHO-83