Hitachi, AAT and India team,
U375 Rear dampers are more robust towards external contamination. They use tougher oil seals with higher hardness material, more interference to piston rod and stiffer springs to apply more uniform contact pressure.
The dust shield also has longer overlap length in full rebound condition (nearly 49 mm), which obviously is more robust towards external contamination entering into the rod/seal area during the full damper travel.
The radial gap between the dust shield and the bump cap is also very optimal which leads to optimal ventilation rating preventing the dust to get sucked up and also preventing bigger particles to enter into the rod/seal area.
Having said that we didn’t see a single failure from U375 Rear dampers (we had one issue from Front and a couple from P375, Ranger) during the entire DV, PV stage from AAT and JMC vehicles (neither from Durability nor from VOCF).
Hence I would request you to provide with more information to understand more about this issue.
- Did the subject vehicle has the rear JB/dust shield intact with the damper when the damper was removed from the vehicle? Can India team send me the pictures of the damper assembly from the other side of the vehicle?
- Hitachi team, I want to see the Internal Contamination test data on U375 rear dampers from the past batches (this is an IP test listed in SCCAF). Please send this info.
- Hitachi team, I want you to go through the teardown analysis once again to see if we are missing anything here?
Hitachi, AAT and India team,U375 Rear dampers are more robust towards external contamination. They use tougher oil seals with higher hardness material, more interference to piston rod and stiffer springs to apply more uniform contact pressure.The dust shield also has longer overlap length in full rebound condition (nearly 49 mm), which obviously is more robust towards external contamination entering into the rod/seal area during the full damper travel.The radial gap between the dust shield and the bump cap is also very optimal which leads to optimal ventilation rating preventing the dust to get sucked up and also preventing bigger particles to enter into the rod/seal area.Having said that we didn’t see a single failure from U375 Rear dampers (we had one issue from Front and a couple from P375, Ranger) during the entire DV, PV stage from AAT and JMC vehicles (neither from Durability nor from VOCF).Hence I would request you to provide with more information to understand more about this issue.- Did the subject vehicle has the rear JB/dust shield intact with the damper when the damper was removed from the vehicle? Can India team send me the pictures of the damper assembly from the other side of the vehicle?- Hitachi team, I want to see the Internal Contamination test data on U375 rear dampers from the past batches (this is an IP test listed in SCCAF). Please send this info.- Hitachi team, I want you to go through the teardown analysis once again to see if we are missing anything here?
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