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III-65
Heater System Operation
Heater and air conditioner systems both have the same basic function of moving heat.
They take advantage of nature
·
s laws where heat energy always moves from a warmer
to a cooler area. In a heater system there is no “change of state” involved in system
operation. The system is sealed and operates under pressure, but the pressure is low
when compared to an air conditioner.
A heater system uses the engine coolant to carry excess heat energy to the cab air.
The heart of the system is the water pump. The water pump forces hot coolant through
a hose from the engine block and through the heater core. The coolant is returned to the
engine cooling system either at the suction side of the water pump or to the radiator.
A control cable, attached to a water valve between the water pump and the heater
inlet, is used to control the flow of coolant to the heater. The heater fan or blower forces
cab air through the heater core where heat energy moves from the engine coolant to
the air in the cab. Figure 2-9 illustrates the main heater system components. In-cab
controls, component housing and air vents are not shown.
The following heater components are discussed in detail in this section:
1.
Heater Core
2.
Water Valves
3.
Defrosters and Ducts
4.
Blowers and Fans
Additional heater controls, ducts, air vents, blend-air doors, temperature regulating
devices and auxiliary heaters may be installed as part of a heater system. These may be
air, vacuum, electrical or mechanically operated.
System Operation
Figure 2-9
This view of a heater system
shows the main components
and how they are connected.
Summary of Contents for TL150
Page 1: ...TL150 Track Loader BOOK No CT7E901 WORKSHOP MANUAL Serial No 21500004...
Page 4: ...0 4...
Page 5: ...I 1 I GENERAL...
Page 18: ...I 14 GENERAL...
Page 19: ...II 1 II SPECIFICATIONS...
Page 44: ...III 1 III MACHINE CONFIGURATION...
Page 94: ...III 51 MACHINE CONFIGURATION ELECTRICAL SYSTEM ELECTRICAL SYSTEM ELECTRICAL WIRING DIAGRAM...
Page 122: ...III 79...
Page 146: ...MACHINE CONFIGURATION III 103...
Page 147: ...IV 1 IV HYDRAULIC UNITS...
Page 152: ...IV 6 HYDRAULIC UNITS HST PUMP 1 Plug 2 Plug 3 Plug 4 Screw 5 Seal Nut 6 Plug Pump Assembly 4 4...
Page 189: ...IV 43 HYDRAULIC UNITS GEAR PUMP INSPECTION AND ADJUSTMENT IV 36 38 TROUBLESHOOTING IV 39...
Page 230: ...IV 84 HYDRAULIC UNITS PILOT VALVE INSPECTION AND ADJUSTMENT IV 79 TROUBLESHOOTING IV 80...
Page 261: ...IV 115 HYDRAULIC UNITS TRAVEL MOTOR DISASSEMBLY AND ASSEMBLY Special tools...
Page 263: ...IV 117 HYDRAULIC UNITS TRAVEL MOTOR...
Page 282: ...IV 136 HYDRAULIC UNITS TRAVEL MOTOR...
Page 283: ...V 1 V TROUBLESHOOTING...