20-02245 REV E
13
SPRING-LOADED BELLOFRAM:
When the pan and tilt is sealed except for the pan axis, insert an appropriately sized
screw with a nut on it into the hole in the compensator cover. Use the screw to draw the
piston back and the nut to retain it thus relieving any pressure on the compensator. Add
compensating fluid (Shell Spindle Oil or equivalent) to the level of the shaft snap ring
groove.
IMPORTANT:
Completely fill the top snap ring groove in the housing with O-ring
lubricant. If this is not done, the O-ring on the end cap could be damaged by the snap
ring groove and the unit will leak.
Position the end cap assembly into the housing without pressing it in. Since fluid may
be ejected through the seal screws holes, place a towel over the end cap to reduce the
losses. Push the end cap down until the O-ring is fully seated into the housing.
Replace the seal screws.
DO NOT
apply large forces to the end of the shaft. If the
harmonic drive does not want to mesh easily, it is helpful to slightly rotate the output
shaft allowing the gear teeth to engage while applying moderate pressure to the end
cap. Install the snap ring, which retains the end cap, and replace the seal screws.
Remove the screw retaining the compensator piston. The unit will now been under
positive pressure. It is recommended that the unit be observed for several hours to
determine if there are any leaks.
