A: If the bucket drifts without input but no external oil is visible, the internal piston seals of the 4448400 kit have likely failed. This internal leak allows oil to move between cylinder chambers, leading to sluggish performance and increased fuel consumption.
A: Beyond cleaning, ensure the seal grooves are inspected for metallic debris. When installing the 4467381 rod seal, use a "kidney fold" technique cautiously to avoid permanent kinking. Proper lubrication and checking the gland nut torque are essential for a long-term leak-free result.
A: This kit is the direct equivalent for OEM numbers 4448395, 4448397, and 4463493. To confirm, match the number of internal components in your old kit with our 4467381 manifest or verify the boom/stick/bucket cylinder coding on your machine's identification plate.
A: Yes, our specialized TPU blend is rated for -35°C to 110°C. It prevents the seals from shrinking and cracking in arctic conditions and resists the softening or "extrusion" that causes failure during high-frequency operation in intense desert heat.
Q: What quality options are available?
A: We provide original, OEM, and high-quality aftermarket versions with stable supply capability.
Q:Why Choose RITO?
A:Listed Factory
Stable&Reliable Quality
OEM Factory for Chinese Top Excavator Brands
Supplier to Fortune 500 Companies





















