Fault Phenomenon: Lonking 855 wheel loader transmission shifts sluggishly, occasionally neutral.

Troubleshooting Process:
– Checked strainer: fine strainer at transmission control valve inlet clogged.
– Checked oil quality: transmission fluid extremely dirty.
– Checked pressure: transmission oil pressure fluctuates.
– Checked spools: spools sticking due to dirty oil.

Root Cause: The fine strainer in front of the transmission control valve is completely clogged with friction material powder and debris, causing insufficient oil flow to the valve body and sluggish shifting.

Required Parts: Clean transmission control valve strainer, replace transmission fluid and filter.