Mack ASET AC, Service Manual

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Page 138
MAINTENANCE
1. Rotate the knob on the air line shut-off valve
to the horizontal (off) position. When the
valve is closed, residual pressure in the filter
and lines is bled to the atmosphere.
2. Turn the filter counterclockwise to loosen
and remove it from the adapter.
3. Apply a thin film of clean engine oil to the
gasket of the new filter.
4. Install the filter to the adapter and
hand-tighten until the gasket contacts the
base. Tighten the filter one additional turn.
5. Rotate the shut-off valve knob to the vertical
(on) position.
DRIVE BELT REPLACEMENT
AND TENSIONING FOR ASET™
AC ENGINES
[216 AA]
General Information
The service life of the poly-V belts is considerably
improved over other systems and allows the use
of higher horsepower cooling fans. All ASET™
engines are equipped with poly-V belt systems.
ASET™ AC ENGINES
In the AC dual poly-V drive belt arrangement, the
fan drive is driven directly from the crankshaft
pulley by a 10-rib poly-V belt. In turn, the water
pump, alternator and the air conditioning
compressor (if equipped) are driven off the
fan-drive hub by a 6-rib poly-V belt (Figure 119).
Two automatic tensioners are used, one for the
fan drive and one for the accessory drive.
119
Figure 119 — AC Belt-Drive Arrangement
1. 10-Rib Poly-V Belt
2. Tensioner
3. Fan-Drive Hub
4. 6-Rib Poly-V Belt
5. Tensioner 6. A/C Compressor
7. Water Pump
8. Alternator
9. Idler Pulley
10. Crankshaft Pulley
maintenance.fm Page 138 Tuesday, July 11, 2006 10:49 AM