Title: Check the inter-axle differential lock operation.
Course: Diesel Equipment Technology I (20107-I) > Section: Preventive Maintenance and Inspection: Servicing the Drive Train

Checking should include the following steps:

- Raise the drive axle, following safety precautions.
- Install the wheel chocks.
- Release the parking brake.
- Manually turn one drive wheel. (The other should remain stationary.)
- Engage the differential lock.
- Manually turn one drive wheel. (The other should turn in the same direction.)

ASE 3: II. Drive Train: E. Drive Axles (P-2)

Process/Skill Questions:

- What damage could be caused by leaving the inter-axle differential lock engaged when highway driving?
- What damage might happen when the inter-axle disengages at highway speeds and when it engages at high speed?
- What steps should be performed to test whether the inter-axle lock is working properly?