Boom lift force dropping or hydraulic oil weeping from the rod on your ZX120 or ZX130? A worn 9185636J boom cylinder allows internal piston bypass to bleed away lift force until the machine can no longer hold a loaded boom, while a scored rod seal leaks oil across the cylinder head. RITO supplies this heavy-duty replacement boom cylinder to restore full ZX120-series boom lift and clean, seal-tight operation.
Item NO.:
9185636J / 44284379185636J Hydraulic Boom Cylinder Assembly for Hitachi ZX120, ZX120-3, ZX130 and ZX135 excavators. Heavy-duty double-acting boom cylinder with chrome-plated precision rod and a honed bore produced to OEM specification. Chrome layer thickness, honing surface finish and the multi-layer piston seal assembly are matched to the ZX120-class lifting duty cycle so the new cylinder delivers original boom holding force and cycle time from installation.
| Part Number | 9185636J / 4428437 |
|---|---|
| Part Name | Hydraulic Boom Cylinder Assembly |
| Compatible Brand | Hitachi |
| Applicable Models | ZX120, ZX120-3, ZX130, ZX135 Excavator |
| Application | Main boom lift hydraulic cylinder for Hitachi ZX120 / ZX130 class excavators |
| Material | High-strength steel body, chrome-plated precision rod |
| Product Color | Yellow or industrial finish |
| Working Temperature | -25°C~+80°C |
| Key Function | Provides hydraulic boom lifting and holding force for ZX120-series excavator work cycles |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Rod chrome layer thickness and adhesion matched to ZX120-series OEM specification, providing the hardness and corrosion resistance that determines boom cylinder seal service life.
Bore honed to OEM surface finish and dimensional tolerance for correct piston seal contact and low internal bypass at full ZX120 working pressure.
9185636J covers ZX120, ZX120-3, ZX130 and ZX135 boom cylinder specification across the Hitachi compact excavator range.
Rod and piston seal assembly rated for ZX120 maximum boom pressure, with buffer seals that protect the primary rod seal from pressure spikes during heavy lifts.
FAQ
Q: How do I tell if the 9185636J boom cylinder has internal bypass or rod seal leakage?
A: External leakage is visible at the rod seal. Internal bypass causes slow boom drift when the boom is held stationary under load without visible external oil. Confirm by holding the boom at mid-stroke and watching for downward drift over 60 seconds.
Q: Can I replace only the seal kit in the 9185636J cylinder?
A: If the rod chrome is undamaged and the bore is within specification, a seal kit repair is economical. Replace the full cylinder if the rod shows pitting, score marks or chrome delamination that would cut the new seals immediately.
Q: What bleeding procedure is needed after fitting 9185636J?
A: Cycle the boom slowly through full extension and retraction five times at low engine speed before applying full load. This purges air and seats the seal assembly before high-pressure operation.
Q: How to confirm 9185636J is correct for my ZX120 or ZX130?
A: Match the existing boom cylinder part number against 9185636J and confirm machine model is ZX120, ZX120-3, ZX130 or ZX135. Provide the machine serial number for cross-reference confirmation.
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
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