A: Extend the boom fully, lock the control valve, disconnect the cylinder rod-end hose safely, apply load, and observe if oil streams out of the open port.
A: Trapped air pockets cause severe hydraulic sponginess, destructive diesel effect ignition, and internal seal burning due to micro-dieseling phenomena during rapid extension.
A: Yes, this item directly replaces parts 187-8959, 187-8960, and 216-4322, matching original dimensions across Caterpillar 325C and 325D lifter layouts.
A: The double-lip metal-cased scraper aggressively clears hard packed mud, ice, and fine silica dust from the rod surface before it passes through pressure seals.
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






















