Cayman 2006 Chassis Information — Section 10 • 231
Air Dryer Cycle
The governor turns the compressor on when the supply tank pressure drops below cut-in pressure.
Compressed air passes into the air dryer at the inlet port:
1. Moisture-laden air and contaminants pass through the desiccant.
2. Moisture is retained by the desiccant. Moisture also collects in the base of the dryer.
3. When the compressor unloads the purge valve opens. The governor turns the compressor off when the
system reaches cutout pressure (approximately 120 psi).
4. The dryer purges and expels water collected in the dryer base.
5. When the regeneration valve opens, the dry system air fl ows back through the dryer. A small charge of
air from the front air tank backfl ows through the fi lter. The backfl ow dries the desiccant, preparing it for
the next cycle.
AIR SPRING INSPECTIONS
Listed below are items that can be checked when the motorhome is in for periodic maintenance.
NOTE:
Never attempt to service the air suspension on a motorhome with the air spring inflated.
• Inspect the Outer Diameter (OD) of the air springs. Check for irregular wear or heat cracking.
• Inspect the air lines to make sure contact does not exist between the air line and the OD of the air springs.
Air lines can rub a hole in an air spring very quickly.
• Check to see that there is suffi cient clearance around the complete circumference of the air spring while at
maximum diameter.
• Inspect the OD of piston for buildup of foreign materials. (On a reversible sleeve style air spring, the
piston is the bottom component of the air spring.)
• The correct ride height should be maintained. All motorhomes with air springs have a specifi ed ride height
established by the manufacturer. This height should be maintained within ¼". This dimension can be
checked with the motorhome loaded or empty.
• The leveling valves (or height control valves) assist in ensuring the total air spring system works as
required. Clean, inspect and replace if necessary.
• Make sure to check shock absorbers for leaking hydraulic oil and worn or broken end connectors. If a
broken shock is found, replace it immediately. The shock absorber will normally limit the rebound of an
air spring and keep it from over-extending.
• Check the tightness of all mounting hardware (nuts and bolts). If loose, tighten. Do not over-tighten.
Cleaning:
The approved cleaning method is to use soap and water, methyl alcohol, ethyl alcohol or isopropyl alcohol.
Unapproved cleaning methods include all organic solvents, open fl ames, abrasive and direct pressurized
steam cleaning.
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