Section 10
--- Chassis Information
The Executive 2005
504
Hydraulic Fan System
The hydraulic fan drive system cools the radiator, charge air cooler, hydraulic fluid cooler, trans-
mission cooler and the dash air conditioning condenser. The components of the hydraulic fan system
are: hydraulic reservoir, filter, pump, hydraulic fan motor(s), hydraulic switching valve and thermovalve.
Cooling fan speed is proportional to engine speed and coolant temperature. When coolant temperature rises
above 185º F, the thermovalve slowly closes off the bypassing hydraulic fluid from the switching
valve. As coolant temperature rises, a spool valve begins to move in the switching valve. The spool
valve directs the pressurized hydraulic fluid to the fan motors. The higher the coolant temperature, the
further the spool valve is moved in the switching valve, providing a higher volume of pressurized
hydraulic fluid to the fan motors. Fan motor speed is increased to meet the demand for cooling. The
action of the thermovalve is designed to move the spool in the switching valve to ramp up fan motor
speed. This design saves horsepower and increases fuel mileage by precise control of hydraulic fan
motor speed. The fan motors will increase in speed when the motorhome is ascending long hills or
operating in high ambient temperatures. It is normal for the fans to "roar" when they are operating.
Fan motor speed and engine RPM are approximately the same with the switching valve at full engage-
ment.
Thermovalve (ISM & Series 60 Engines)
The wax filled thermovalve, mounted at the top of the radiator, controls the action of the switching
valve. When the radiator is cool, hydraulic fluid is allowed to flow through the inlet and outlet ports of
the thermovalve and return to the hydraulic reservoir. As coolant temperature inside the radiator rises to
approximately 185º F, wax inside the thermovalve begins to melt and expand, which restricts hydraulic
fluid flow through the thermovalve. The restricted hydraulic fluid pressure then begins to move the
internal spool valve of the switching valve. This process will continue until coolant temperature
inside the radiator reaches approximately 199º F. At this temperature, hydraulic fluid flow through
the thermovalve is stopped, moving the spool valve to full open position.
Summary of Contents for Executive 2005
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Page 30: ...Section 1 General Information The Executive 2005 30 NOTES...
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Page 92: ...Section 2 Driving Safety The Executive 2005 92 Weight Label 100179D...
Page 98: ...Section 2 Driving Safety The Executive 2005 98 020254...
Page 101: ...Driving Safety Section 2 The Executive 2005 101 020263 WEIGHT RECORD SHEET 020262...
Page 102: ...Section 2 Driving Safety The Executive 2005 102 WEIGHT RECORD SHEET 020262...
Page 103: ...Driving Safety Section 2 The Executive 2005 103 010763d 010689d VIEWS Front Rear...
Page 104: ...Section 2 Driving Safety The Executive 2005 104 010687e 010688c Roadside Curbside...
Page 119: ...Driving Safety Section 2 The Executive 2005 119 NOTES...
Page 120: ...NOTES 120 The Executive 2005 Section 2 Driving Safety...
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Page 132: ...Section 3 Exterior Interior Care The Executive 2005 132 Fabric Specifications Charts...
Page 133: ...Exterior Interior Care Section 3 The Executive 2005 133...
Page 134: ...Section 3 Exterior Interior Care The Executive 2005 134...
Page 135: ...Exterior Interior Care Section 3 The Executive 2005 135...
Page 136: ...Section 3 Exterior Interior Care The Executive 2005 136 Ralph Lauren Fabrics Optional Package...
Page 137: ...Exterior Interior Care Section 3 The Executive 2005 137...
Page 138: ...Section 3 Exterior Interior Care The Executive 2005 138...
Page 164: ...Section 3 Exterior Interior Care The Executive 2005 164 NOTES...
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Page 204: ...Section 4 Appliances The Executive 2005 204 NOTES...
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Page 264: ...Section 5 Equipment The Executive 2005 264 NOTES...
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Page 299: ...Water Systems Section 6 The Executive 2005 299 TYPICAL WATER BAY 040496c...
Page 301: ...Water Systems Section 6 The Executive 2005 301 NOTES...
Page 302: ...Section 6 Water Systems The Executive 2005 302 NOTES...
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Page 321: ...LP Gas Systems Section 7 The Executive 2005 321 NOTES...
Page 322: ...Section 7 LP Gas Systems The Executive 2005 322 NOTES...
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Page 380: ...Section 8 Electrical Systems House The Executive 2005 380 Wiring Systems Interfaced...
Page 381: ...Electrical Systems House Section 8 The Executive 2005 381 NOTES...
Page 382: ...Section 8 Electrical Systems House The Executive 2005 382 NOTES...
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Page 419: ...Electrical Systems Chassis Section 9 The Executive 2005 419 ENGINE NO START FLOW CHART...
Page 420: ...Section 9 Electrical Systems Chassis The Executive 2005 420 NOTES...
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Page 523: ...Chassis Information Section 10 The Executive 2005 523 METRIC U S CONVERSION CHART...
Page 525: ...Chassis Information Section 10 The Executive 2005 525...
Page 526: ...Section 10 Chassis Information The Executive 2005 526...
Page 527: ...Chassis Information Section 10 The Executive 2005 527...
Page 529: ...The Executive 2005 Index...
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Page 538: ...Index The Executive 2005 538 NOTES...