What procedure is required when assembling a twin countershaft transmission main section?

When assembling a twin countershaft transmission main section, it is crucial to measure and set the shaft endplay. This procedure ensures that there is the correct amount of axial movement allowed for the shafts within the transmission. Proper endplay is essential not just for smooth operation, but also to avoid excessive wear and potential damage to transmission components over time. If endplay is not set correctly, it could lead to issues such as increased friction, overheating, or even catastrophic failure of the transmission due to binding or misalignment.

The measurement of shaft endplay involves using a dial indicator to check the movement of the shafts. After determining the endplay, appropriate shims or adjustments may be used to achieve the desired specifications. Setting the endplay is a meticulous process and a critical step that cannot be overlooked in ensuring the longevity and reliability of the transmission system.