ENGINE AR- 5160811 - Caterpillar

3. Make sure each solenoid is connected to the ground screw on the vibratory valve body. Secure ground connection if necessary.4. With the key switch and the vibratory switch both on, use a voltmeter to check whether the solenoid is getting 12 volts.5. If the solenoid is not getting 12 volts, check whether 12 volts is available at the vibratory switch.6. If there is 12 volts at the vibratory switch but not at the solenoid, the vibratory switch may have to be replaced, or the wiring between the switch and the solenoid is faulty.7. If 12 volts is not available at the vibratory switch, check ignition terminal of key switch for 12 volts. If 12 volts is present, check wire continuity from key switch to vibratory switch.8. If 12 volts is not present at ignition terminal, either the key switch is faulty or 12 volts is not available from the alternator or battery.9. Repair or replace faulty components or wiring. If the solenoid itself seems to be all right, and the tach/hour meter and oil pressure light are not working, the wiring to the key switch may be faulty or the key switch may be damaged.D. Vibratory System Pressure Check
1. Raise the entire machine on blocks so the drums can rotate without moving the machine.2. Install a 0 to 34 500 kPa (0 to 5000 psi) pressure gauge with a suitable hose and tee, in the pressure line to the vibratory motor being tested. 3. Start engine and run at full throttle. 4. Move the propel lever forward just enough so the brake light goes out and the drums rotate slowly. 5. Turn on the vibratory system for the motor not being tested. 6. Now turn on the vibratory system for the motor being tested. Observe the pressure gauge.7. Hydraulic pressure should peak at about 13 800 kPa (2000 psi), then decrease to about 12 400 kPa (1800 psi) as the motor gets up to speed.8. If the peak pressure is higher than 13 800 kPa (2000 psi), adjust the relief valve following the procedure in section E.9. If the operating pressure is too low, adjust the relief valve (section E). If this does not solve the problem, refer to the Troubleshooting Guide or the Test Procedure Flow Chart to identify and solve the problem.10. Repeat this procedure for the other vibratory motor if desired. If the pressure in the front vibratory motor is too low, the problem may be in the parking brake system. If the operating pressure is very low but the motor seems to be running well, the hoses might be plumbed wrong at the motor or at the vibratory valve, causing the motor to run backwards.E. Relief Valve Adjustment
1. Perform the vibratory system pressure check (section D). Leave the pressure gauge installed to the motor.2. The vibratory valve block contains two relief valves; one for the front drum, and one for the rear drum. Note relief valve locations in relation to ports "P1" and