G 120 II V
Page 72
1st Edition, Rev. 0 Chg. 2
CHAPTER 5:
COMPRESSOR DRIVE; G 120 II V
5.1
Vertical Compressor Drive
The compressor is driven by the drive motor through a V-belt. The direction of rotation, as seen facing
the flywheel, is counterclockwise. Observe the arrow on the compressor block. Check the V-belt regu-
larly for damage and wear. See Paragraph 5.2.2. Replace if necessary.
5.2
Maintenance of the V-belt and Sheaves
5.2.1
Check The Sheaves.
Before a new set of drive belts are installed, the condition of the sheaves should be checked. Dirty or
rusty sheaves impair the drive’s efficiency and abrade the cover of the belts, which results in premature
failure. Worn sheaves shorten belt life as much as 50%. If the grooves are worn to the point where the belt
bottoms, slippage may result and the belts may burn. If the side walls are “dished out,” the bottom shoul-
der ruins the belt prematurely by wearing off the bottom corners.
5.2.2
Check the V-belt
Check the V-belt regularly for damage and wear. Replace if necessary. V-belt tension is adjusted auto-
matically by the spring tension idler.
Figure 5-1
Vertical Drive with Idler (typical)
1. Compressor flywheel
2. V-belt
3. Spring Tension Idler
4. V-belt sheave
5. Bushing
6. Electric motor
1
2
3
4
5
6
R
O
TA
TI
ON
