PUMP GP-PISTON 3524500 - Caterpillar

Starting System
When the engine has a prelube system, check it first to be sure all components function correctly. See PRELUBE SYSTEM. After checking the prelube system, put a wire temporarily between the connections of the oil pressure switch. This will let the following checks be made which is the same as checking engines that do not have a prelube system.Use a D. C. Voltmeter to find starting system components which do not function.Move the starting control switch to activate the starter solenoid. Starter solenoid operation can be heard as the pinion of the starter motor is engaged with the ring gear on the engine flywheel. The solenoid operation also closes the electric circuit to the motor. Connect one lead of the voltmeter to the solenoid connection (terminal) that is fastened to the motor. Ground the other lead. Activate the starter solenoid and look at the voltmeter. A reading of battery voltage shows the problem is in the motor. The motor must be removed for further testing. No reading on the voltmeter shows that the solenoid contacts do not close. This is an indication of the need for repair to the solenoid or an adjustment to be made to starter pinion clearance. Pinion clearance is .36 in. (9.1 mm).If the solenoid for the starting motor will not operate, current from the battery may not be getting to the solenoid. Fasten one lead of the voltmeter to the connection (terminal) for the battery cable on the solenoid. Ground the other lead. No voltmeter reading shows there is a broken circuit from the battery. Further testing is necessary when there is a reading on the voltmeter.Further test by fastening one voltmeter lead to the connector (terminal) for the small wire at the solenoid and the other lead to the ground. Look at the voltmeter and activate the starter solenoid. A voltmeter reading shows that the problem is in the solenoid. No voltmeter reading shows that the problem is in the starter switch or wiring. Fasten one lead of the voltmeter to the battery wire connection of the starter switch and ground the other lead. A voltmeter reading indicates a failure in the switch.A starting motor that operates too slow can have an overload because of too much friction in the engine being started. Slow operation of the starting motor can also be caused by shorts, loose connections and/or dirt in the motor.Pinion Clearance Adjustment (Delco-Remy)
Whenever the solenoid is installed, make an adjustment of the pinion clearance. The adjustment can be made with the starting motor removed.1. Install the solenoid without connector (1) from the MOTOR connection (terminal) on solenoid to the motor.
CONNECTION FOR CHECKING PINION CLEARANCE
1. Connector from MOTOR terminal on solenoid to motor. 2. SW terminal. 3. Ground terminal.2. Connect a battery, of the same voltage as the solenoid, to the terminal (2), marked SW.3. Connect the other side of battery to ground terminal (3).4. Connect for a moment, a wire from the solenoid connection (terminal) marked MOTOR to the