ROTATING GP-PUMP 2052438 - Caterpillar

Component Testing
Valve Assembly
To test the valve assembly, remove the ether bottle and jumper around the temperature switch. With the toggle switch in the Auto position, crank the engine. Observe the valve to see if it is functioning (valve will actuate). It is important to make sure that the resistor is still in place to protect the solenoid.Control Group
Test the control group using the test diagram shown. Perform the tests in sequence at both 18.0 0.5 VDC and 32.0 0.5 VDC. Start the test with SW1 and SW2 open.
Test Circuit DiagramNormal Operation
With SW1 open, close SW2. The solenoid should pull in.Short Circuit
Turn power on by closing SW2. Close SW1. Maximum current reading on ammeter should be 500 mA.Reverse Polarity
1. With the power off, reverse leads. Connect Lead No. 1 to -Battery and Lead No.2 to +Battery.2. Turn power on by closing SW2. The solenoid should not pull in.3. Turn power off by opening SW2. Reconnect leads for normal operation.Resistor Check
The resistance of the Resistor Assembly should be 20 1 Ohm. Be certain to check the resistor itself, not just the leads from the resistor. There is a diode in the lead line. Testing here will not give the desired results.
Resistor Assembly CheckTemperature Switch Assembly
Remove the Temperature Switch Assembly from the system. Immerse the Temperature Switch Assembly in an ice bath. Using an ohmmeter check the resistance between the pins in the receptacle. At a temperature of 13°C (55°F) the resistance should be less than 1 Ohm. Warm the sensor and measure the resistance. At a temperature of 18 to 24°C (61 to 82°F) the resistance should be greater than 20k Ohms.Ether Cylinder Removal
Non-Empty Cylinders
Ether is poisonous and flammable. Breathing ether vapors or repeated contact of ether with skin can cause personal injury. Use ether only in well ventilated areas. Use ether with care to avoid fires. Do not smoke while changing ether cylinders. Do not store ether cylinders in direct sunlight or at temperatures above 48°C (120°F). Discard ether cylinders properly. Do not puncture or burn ether cylinders. Keep ether cylinders out of reach of unauthorized personnel.
1. Turn the disconnect switch to the OFF position.2. Remove ether cylinder(s).3. Perform the desired service operations.4. Install the ether cylinder(s). Hand tighten the ether cylinder to the solenoid valve.Warm Climate Applications
In warm climates, [(temperatures never below 10°C (50°F)], it may be desirable to remove the ether cylinders but keep the system intact for future use. It may also be desirable to remove the ether cylinders during summer months.Ether Cylinder Replacement
Ether is poisonous and flammable. Breathing ether vapors or repeated contact of ether with skin can cause personal injury. Use ether only in well ventilated areas. Use ether with care to avoid fires. Do not smoke while changing ether cylinders. Do not store ether cylinders in direct sunlight or at temperatures above 48°C (120°F). Discard ether cylinders properly. Do not puncture or burn ether cylinders. Keep ether cylinders out of reach of unauthorized personnel.
Always check the following before installing the