PUMP A. 2A4424 - Caterpillar

Illustration 1. Damage to solenoid contacts because of low batteries. See Illustration 2 for similar damage to contact disc.
Illustration 2. Damage to contact disc because of low batteries. See Illustration 1 for similar damage to solenoid contacts.
Illustration 3. Damaged contact disc because of low batteries.
Illustration 4. Normal wear pattern on contact disc.Possible causes of the above results or faults are:
... low or no alternator output.... loose fan belt(s) causing low or no alternator output.... battery problems such as a shorted cell.... poor/loose connections between the batteries and starting motor. This means anywhere in the positive or negative (disconnect switch) leads.