TROUBLESHOOTING /SYSTEM PERFORMANCE Troubleshooting
Ａ-9.Abnormal noise or inability to travel
（２）Lack of oil in reduction gear box or its deterioration
Remove the reduction gear box level plug ① to check for the oil level. Also sample the oil by removing the drain plug ② and check it for contamination, emulsification (entry of water) and viscosity.
Lack of oil or deterioration
Refill the reduction gear box to the specified level or change oil. （For specified oil, refer to the Operation and Maintenance Manual.）
Oil level too high
Normal
If the oil level is excessive, remove the drain plug ② to reduce oil to the specified level. Then, operate the machine to check whether the oil level rises again.
Oil level too high
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Hydraulic fluid is leaking into the reduction gear box due to faulty HST motor rear oil seal ③ or faulty brake piston O-ring ④. Perform repair immediately if the HST motor rear oil seal is faulty. Operating the machine with a faulty rear oil seal leads to significant reduction of hydraulic fluid and ultimately to serious accidents possibly resulting from seizure and sticking-up of the HST pump and ｍotor, dragging brakes, seizure and premature wear of brake disks.
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