Engine Maintenance 9-36
SLe, SLX, SLXe, SLXi and Spectrum Belt Adjustments
SLe, SLX, SLXe, SLXi and Spectrum units have an automatic tensioning polygroove belt system driving the condenser and
evaporator fanshaft. The lower polygroove belt runs from the engine or electric motor to the intermediate jackshaft. The upper
polygroove belt runs from the intermediate jackshaft to the fanshaft and includes the drive for the alternator.
Water Pump Belt Replacement and Adjustment
The water pump belt tension should read 35 on the belt gauge. Thermo King Belt Gauge Tool (P/N see tool catalogue)
NOTE: On model 30 units, the lower fan belt must be removed to remove the water pump belt. (SLe and Spectrum SL units
only)
1. Remove the bolts on the water pump pulley. Refer to “Belt Arrangement – SL 30 Models”, or “Belt Arrangement – SL 50
Models” for illustrations of the adjustable water pump pulley.
2. Remove the pulley sliding section and remove the belt.
3. Install new belt on the stationary pulley.
4. Replace the sliding pulley section on the pulley. Add or remove shims to adjust the belt tension.
5. Tighten the mounting bolts on the water pump pulley. The belt tension should read 35 on the belt gauge.
Belt Arrangement – SLe and Spectrum SL 30 Models
1. Water Pump Belt
2. Lower Polygroove Belt
3. Idler
4. Teinioner Assembly
5. Jackshaft Pulley (Lower Polygroove Belt)
6. Alternator
7. Fanshaft Bearing Assembly (Control Box Side)
8. Fanshaft Pulley
9. Upper Polygroove Belt
10. Alternator Pulley
11. Jackshaft Pulley (Upper Polygroove Belt)
12. Jackshaft
13. Engine Pulley
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