Main hydraulic pressure dropping or slow cycle times on your ZX120-1? A worn HPK055 pump lets the rotating group bypass internally, starving every circuit. RITO rebuilds this main pump to OEM clearances so your machine's dig force and speed come back from the first hour.
Item NO.:
HPK055Order(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In StockHPK055 Excavator Main Hydraulic Pump for ZX120-1. Precision-machined barrel bores and lapped valve face restore volumetric efficiency, while the factory-calibrated regulator maintains stable pressure-flow output across the full working range.
| Part Number | HPK055 |
|---|---|
| Part Name | Excavator Hydraulic Main Pump (Piston Pump) |
| Compatible Brand | ZX120-1 Main Pump |
| Applicable Models | ZX120-1 Excavator |
| Application | Main hydraulic pump for ZX120-1 excavator all-function operation |
| Material | High-strength alloy steel |
| Product Color | Metallic industrial finish |
| Working Temperature | -25°C~+60°C |
| Key Function | Generates main hydraulic flow and pressure for ZX120-1 work circuits |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
The HPK055 cylinder block, pistons and shoes are machined to OEM clearance, restoring volumetric efficiency on the ZX120-1.
Barrel face and valve plate are surface-matched to Ra 0.2, eliminating break-in leakage on the ZX120-1 main circuit.
The regulator is pre-set to the ZX120-1 engine power curve, preventing overload during combined boom, swing and travel demand.
HPK055 port configuration and flange are confirmed for the ZX120-1, providing direct bolt-on installation.
FAQ
Q: What symptoms indicate the HPK055 pump needs replacing on a ZX120-1?
A: Main circuit pressure falls below specification, all functions slow simultaneously, case-drain flow exceeds the OEM limit, and oil temperature rises faster than normal.
Q: Does the HPK055 pump include a matched valve plate?
A: Yes, this HPK055 assembly includes a new matched valve plate and rotating group, so the sealing interface is correct from installation.
Q: What other models does the HPK055 pump fit?
A: Cross-reference keywords HPK055 / Hydraulic Main Pump / ZX120-1 Hydraulic Pump / Excavator Main Pump / Axial Piston Pump / Hydraulic Power Unit apply. Confirm your machine serial number with our team to verify compatibility with other models.
Q: How to confirm the HPK055 is the correct pump for my ZX120-1?
A: Match the pump model plate reading HPK055 and confirm the machine is ZX120-1. Provide pump and machine serial numbers to our team for exact 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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