SHAFT-CLUSTER GEAR 1011378 - Caterpillar

For basic troubleshooting, perform the following steps first in order to diagnose a malfunction.
Gather information about the complaint from the operator.
Verify that the complaint is not due to normal operation. Verify that the complaint is not due to error of the operator.
Perform a visual inspection. Inspect the following items:
Engine oil level
Coolant level
Wiring and electrical connectorsFor problems that are related to the electrical system, be sure to check the electrical connectors. This is specially true for problems that are intermittent.If these inspections do not reveal any problems, identify the probable causes of the symptoms.This section provides the symptoms of some possible problems. Some probable causes and recommended repairs are suggested. The service technician must determine the most likely probable causes.All of the probable causes and recommended repairs cannot be provided. Additional work beyond the recommendations may be needed. A problem is not normally caused by a single part. Most problems involve the relationships of parts.The probable cause of a problem only provides an indication of the location of a possible problem. Conditions such as contamination or improperly adjusted components can cause some engine symptoms.Narrow the probable cause. Consider the operator's information, the operating conditions, and the heater's maintenance record. Service personnel may remember similar complaints which were corrected by a previous method of troubleshooting. However, a similar complaint can have a different cause.The Fluid Does Not Heat
Probable Causes
No electrical power
Blown fuse
Problem with the flow switch
Problem with the thermostat
Problem with the heating elementRecommended Repairs
Electrical Power
Make sure that the control box's "ON/OFF" switch is in the "ON" position. Observe the power light on the control box.If the power light is not on, make sure that the main power supply and the 24 V supply are ON.If the power supplies are ON but the power light on the control box is OFF, troubleshoot the electrical system.Fuses
Inspect the fuses for the main power supply. Inspect the fuses in the control box. Replace any blown fuse.If the fuse is blown again, troubleshoot the electrical system.Flow Switch
If the flow switch is not operating properly, the flow switch can improperly remove the power supply from the heating element.Make sure that the flow switch is operating correctly. Inspect the flow switch and clean the flow switch. For instructions, refer to Systems Operation Section, "Maintenance".Replace the flow switch, if necessary.Thermostat
The thermostat's contactor is normally open. If the temperature is less than the thermostat's rating, the thermostat's contactor closes in order to energize the heating element. If the temperature becomes greater than the thermostat's rating, the thermostat opens again.To verify whether there is a problem with the thermostat, measure the thermostat's resistance at a temperature that is less than the thermostat's closing temperature. If the resistance is