A: If the upper cabin chassis continuously drifts when parked on slight inclines, or if rotation over-travel happens after releasing control levers, the brake discs are worn.
A: A blocked or restricted case drain line spikes internal housing pressure instantly, causing the main shaft seal to blow out and leaking motor oil everywhere.
A: Yes, part 121-1564 aligns perfectly with OEM mounting hole circles, splines, and plumbing interfaces on Caterpillar 320B and 320C medium machinery.
A: Built with highly efficient internal oil galleries, the assembly lowers mechanical drag and promotes continuous casing cooling, preventing oil thinning under intense continuous swinging.
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






















