844K Wheel Dozer Caterpillar

• Know if the symptom is a characteristic of normal operation or a failure.

• Use all available service literature to understand the machine systems and perform troubleshooting.

• Refer to Electrical Schematic, UENR4996, "844K Wheel Dozer (T4F) Electrical System Schematic".

• Refer to Electrical Schematic, UENR1697, "844K Wheel Dozer (LRC) Electrical System Schematic"

• Refer to Hydraulic Schematic, UENR4895, "844K Wheel Dozer (T4F & LRC) Hydraulic System Schematic".

• Refer to Systems Operation/Test & Adjust, UENR4599, "844K Wheel Dozer (T4F & LRC)Machine Systems Operation/Testing & Adjusting "

• Refer to Specifications, UENR4598, "844K Wheel Dozer (T4F & LRC) Machine Systems Specifications".

1. Speak with the operator about the symptom to acquire the following Information:

   • Machine performance prior to the failure.

   • First occurrence of the symptom.

   • Operating conditions at the time of the failure.

   • Sequence of events prior to the failure.

   • Troubleshooting steps that have been taken.

2. Inspect the machine for problems and unusual odors or noises.

3. Research machine records for:

   • Machine preventive maintenance history.

   • Machine repair history.

   • Related specific serial number service information.

1. Operate the machine.

   Repeat the conditions that caused the failure.

2. Check the gauges.

   Look for unusual indications.

1. Determine if an electronic control module (ECM) has detected any faults.

2. Use the information from the operator and your inspection.

3. If there is more than one symptom, identify a common cause.

Use the form in the Service Information System (SIS) web site or Component Based Troubleshooting (CBT).

Write a brief description about the symptom, testing, and repair. Include your phone number or e-mail address so you can be contacted. This feedback helps Caterpillar improve service information.