GUARD AS 1720201 - Caterpillar

The components of the three different types of heaters are identified in Illustrations 1, 2, and 3. After the Illustrations, the individual components are described in more detail.Jacket Water Heater
Illustration 1 g00884212
Jacket water heater's components
Table 1
Jacket Water Heater's Components    
Item    Description    Item    Description    
1     Motor's protective switch     9     Time delay relay    
2     Contactor     10     Fuse    
3     Contactor     11     24 V Relay    
4     Pressure relief valve     12     Transformer    
5     Solenoid valve     13     Fuse    
6     Flow switch     14     Pump assembly    
7     Thermostat     15     Pump seal kit    
8     Heating element     16     Motor    Lube Oil Heater
Illustration 2 g00871208
Lube oil heater's components
Table 2
Lube Oil Heater's Components    
Item    Description    Item    Description    
1     Motor's protective switch     11     Fuse    
2     Contactor     12     Fuse    
3     Contactor     13     Seal    
4     Thermostat     14     Pump    
5     Flow switch     15     Pump and motor assembly    
6     Heating element's thermostat     16     Pump motor    
7     Heating element     17     Plate (ON/OFF)    
8     Hose assembly     18     On/Off switch    
9     Time delay relay     19     Contact block    
10     Transformer     20     Panel (Control)    Combined Heater
Illustration 3 g01365909
Combined heater's components
Table 3
Combined Heater's Components    
Item    Description    Item    Description    Item    Description    
1     Fuse     13     Thermostat (coolant)     25     24 V Relay    
2     Fuse     14     Thermostat (lube oil)     26     Transformer    
3     Contactor     15     Heating element (lube oil)     27     Light    
4     Contactor     16     Thermostat (high limit)     28     Panel (control)    
5     Motor's protective switch     17     Pump and motor assembly     29     Plate (ON/OFF)    
6     Motor's protective switch     18     Pump (coolant)     30     On/Off switch    
7     Heating element (coolant)     19     Seal kit     31     Contact block    
8     Flow switch     20     Hose assembly (lube oil)     32     Motor    
9     Solenoid valve     21     Time delay relay     33     Pump and motor assembly    
10     Check valve     22     Fuse     34     Motor    
11     Hose assembly (coolant)     23     Fuse     35     Pump (lube oil)    
12     Pressure relief valve     24     Fuse     36     Seal    Control Box
The components in the control box are identified in Illustration 4. Each component is discussed below.
Illustration 4 g00883617
(1) Motor's protective switch (2) Motor's contactor (3) Heating element's contactor (4) Transformer (5) Time delay relay (6) Control relay (7) FuseMotor's Protective Switch
The motor's protective switch protects the pump motor from