Fault Phenomenon: SANY SW956 wheel loader when shifting gears, the shift lever travel is excessive, sometimes unable to engage or engages wrong gear.

Troubleshooting Process:
– Checked linkage: shift cable or linkage ball joint worn and loose.
– Checked fork: internal transmission shift fork shaft worn.
– Checked adjustment: improper linkage length adjustment.
– Checked lock: shift lever lock mechanism failed.

Root Cause: The ball joint pin of the shift control linkage is severely worn, causing excessive free play in the shift lever and inability to accurately actuate the transmission control valve spool.

Required Parts: Replace shift linkage ball joint pin and bushings, readjust linkage length.