6
Inspection and Maintenance
Before you begin
Operating Instructions – Explosion-Proof VARIMOT
®
Variable Speed Gear Units and Accessories
33
6.2
Before you begin
Required
tools/resources
• Set of wrenches
• Hammer
• Drift or punch drift
• Snap ring, mounting press
6.3
Checking torsional play
The torsional play of the output shaft is increased through wear of the friction ring.
The torsional play can be checked as follows:
1. Remove fan cover of drive motor
2. Adjust output speed to 1:1 (approximately value "80" on the scale of the position indi-
cation, see figure 3 on page 11)
3. Check torsional play
• At motor fan blade
• With fixed drive shaft
4. Torsional play > 45°:
• Check friction ring (see "Checking and replacing the friction ring")
