PUMP GP-GOV & FUEL INJ 7C8972 - Caterpillar

Troubleshooting
To reduce troubleshooting difficulty, find the problem in the Problem List that best describes the fault that is occurring. To make a repair to a problem, make reference to the probable cause.This list of problems and probable causes give an indication of where the possible problem is and what repairs are needed. Sometimes more or other repair work is needed beyond the recommendations in the list. Remember that a problem is not normally caused by one part, but by the relation of one part with other parts. This list does not give all possible problems and probable causes. The serviceman must find the problem and its source, then make the necessary repairs.Problem List
1. Alternator does not charge.2. Alternator charge rate is low or not regular.3. Alternator charges too much.4. Alternator is noisy.Problems
Problem 1: Alternator Does Not Charge
Probable Cause:1. Loose drive belt for alternator: Adjust the alternator drive belt.2. Loose alternator drive pulley: Check the pulley for wear. If it is worn, install a new pulley. Tighten the pulley nut to a torque of 100 7 N m (75 5 lb ft).3. Charging or ground return circuit or battery connections are defective: Inspect all cables and connections. Clean and tighten all connections. Replace defective parts.4. Field coil or regulator is defective: Install a new field coil or regulator.Problem 2: Alternator Charge Rate Is Low Or Not Regular
Probable Cause:1. Loose drive belt for alternator: Adjust the alternator drive belt.2. Loose alternator drive pulley: Check the pulley for wear. If it is worn, install a new pulley. Tighten the pulley nut to a torque of 100 7 N m (75 5 lb ft).3. Charging or ground return circuit or battery connections are defective: Inspect all cables and connections. Clean and tighten all connections. Replace defective parts.4. Regulator is defective: Replace the regulator.5. Rectifier is defective: Replace the rectifier.Problem 3: Alternator Charges Too Much
Probable Cause:1. Alternator or regulator has loose connections: Tighten all connections to alternator or regulator.2. Regulator is defective: Install a new drive belt for the alternator.Problem 4: Alternator Is Noisy
Probable Cause:1. Drive belt for alternator is worn or defective: Install a new drive belt for the alternator.2. Loose alternator drive pulley: Check the pulley for wear. If it is worn, install a new pulley. Tighten the pulley nut to a torque of 100 7 N m (75 5 lb ft)3. Drive belt and drive pulley for alternator are not in alignment: Make an adjustment to put the drive belt and drive pulley in correct alignment.4. Alternator bearings are worn: Install new bearings in the alternator.Alternator Output Test
These procedures are for testing the alternator while on the machine. However, the listed output specifications apply to On Machine testing or Bench testing.1. Put the multimeter positive (+) lead on the POS terminal of the alternator. Put the negative (-) lead on the GRD terminal or the frame of the alternator. Put the clamp-on ammeter around the positive output wire of the alternator.2. Turn off all