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64 BCXC-SVX01B-EN
Maintenance
sheaves and pull tight. Adjust sheaves and tighten the sheave set screws to the correct torques
recommended in Tab le 31.
Fan Assembly Set Screws
Check and adjust fan wheel, bearing, and sheave set screws whenever a component is removed
or an adjustment is made. Refer to Table 31 for recommendations.
Fan Belt Tension
Proper belt tension is necessary to endure maximum bearing and drive component life and is
based on fan brake horsepower requirements. Replace belt when frayed or worn.
Fan belt tension should only be tight enough so the belt does not slip and maintains adequate
airflow.
Note: Check fan belt tension at least twice during the first days of new belt operation since there
is a rapid decrease in tension until belts are run-in.
Be careful not to over-tension fan belt. Excessive tension will reduce fan and motor bearing life,
accelerate belt wear and possibly cause shaft failure. Clean the sheaves and belt with a dry cloth.
Keep oil and grease away from the belt because they may cause belt deterioration and slippage.
Trane does not recommend belt dressing.
Figure 15. Clearance recommendation to
prevent fan frame and belt interface
Figure 16. Correct sheave alignment
Table 31. Recommended torques for tightening sheaves and bearing thrust collar
Torque (in.-lb) Ft-lb N-m
Sheave setscrew 144 12 16.3
Bearing thrust collar 66 5.5 7.5
Fan wheel screw 144 12 16.3