CHASSIS INFORMATION - 10
179
CAYMAN 2007
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. The governor turns the compressor
off when the system reaches cutout
pressure (approximately 145 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 items should be checked when the
motorhome is in for periodic maintenance.
NOTE:
Never attempt to service the air
suspension on a motorhome with the air
springs inflated.
Inspect
the
Outer Diameter (OD)
of
the air springs. Check for irregular wear
or heat cracking.
Inspect
air lines to ensure contact does
not exist between air line and air springs.
Air lines can rub a hole in an air spring
very quickly.
Ensure 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
inch. 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.
HEIGHT CONTROL VALVES
Height Control Valves (HCV)
infl ate or
defl ate air springs to maintain proper suspension
height throughout the load range. Two Height
Control Valves are installed at the rear drive
axle to control rear suspension height and left
or right tilt of the motorhome. A separate HCV
is installed to control front suspension height.
The three HCVs mount to the main frame of the
motorhome, above the axles, with a linkage rod
connecting the valve to the axle.
Actuating components inside of the valves
are oil dampened to reduce valve reaction to
momentary suspension bounce and rebound.
When a constant suspension change occurs,
such as a load change or weight transfer through
a sustained corner, the valve reacts by adding or
purging air from the air springs as needed.
The air springs mount between the axle H-
frame assembly and the two main frame rails.
Air spring support plates mount to the main
frame and the H-frame. There is a specifi ed
distance the air spring must maintain between
the mounting plates. Other than specifi ed
distance between the plates will compromise
ride quality and handling, and affect shock
absorber travel, drive shaft angle, as well as
various other running gear components.
Summary of Contents for CAYMAN 2007
Page 12: ...GENERAL INFORMATION 1 CAYMAN 2007 8 NOTES...
Page 14: ......
Page 16: ......
Page 52: ...DRIVING SAFETY 2 CAYMAN 2007 48 NOTES...
Page 80: ...EXTERIOR INTERIOR CARE 3 CAYMAN 2007 76 NOTES...
Page 100: ...APPLIANCES 4 CAYMAN 2007 96 NOTES...
Page 132: ...WATER SYSTEMS 6 CAYMAN 2007 128 NOTES...
Page 160: ...ELECTRICAL SYSTEMS HOUSE 8 156 CAYMAN 2007 NOTES...
Page 226: ...INDEX 222 CAYMAN 2007 NOTES...