ZX70 or ZX75 hydraulic system responding sluggishly or pump making a whining noise under load? A worn 4437197 main pump loses the high volumetric efficiency required for the compact ZX70/ZX75 LS system to maintain stable actuator speed. RITO supplies this Korean-standard heavy-duty pump assembly, restoring the fast-response flow your ZX70 or ZX75 system demands.
Item NO.:
4437197-HDOrder(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock4437197 Hydraulic Main Pump Assembly for Hitachi ZX70 and ZX75 excavators (Korean OEM-grade / HD quality). Compact axial piston pump with internal regulator matched to Hitachi ZX70/ZX75 engine power and LS signal specification. Korean OEM-sourced key components provide the dimensional accuracy and material quality needed for high-duty LS pump performance in compact excavators.
| Part Number | 4437197 |
|---|---|
| Part Name | Hydraulic Main Pump Assembly (HD / Korean Grade) |
| Compatible Brand | Hitachi |
| Applicable Models | ZX70, ZX75 Excavator |
| Application | Compact axial piston main pump for Hitachi ZX70 / ZX75 LS hydraulic system |
| Material | Korean OEM-grade alloy steel rotating group and housing |
| Product Color | Industrial finish |
| Working Temperature | -25°C~+60°C |
| Key Function | Provides variable flow for Hitachi ZX70 / ZX75 load-sensing hydraulic system |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Key rotating group components sourced from Korean precision manufacturers, providing dimensional accuracy and material hardness comparable to Hitachi OEM pump specification.
Low-bypass rotating group maintains the tight volumetric efficiency required for the ZX70/ZX75 LS system to hold stable standby pressure and respond quickly to load changes.
Single part number 4437197 covers both ZX70 and ZX75, simplifying spare part procurement for dealers servicing both compact models.
Regulator pre-set to Hitachi ZX70/ZX75 engine power limit, protecting the compact engine from overload during full-power hydraulic demand.
FAQ
Q: What are the symptoms of a worn 4437197 pump on ZX70?
A: Actuators slow progressively across all functions, standby pressure on the LS gauge drops below specification, pump makes a high-pitched sound at high pressure, and hydraulic oil overheats faster than normal.
Q: What does HD (Korean origin) mean for 4437197?
A: HD indicates this pump assembly is assembled with heavy-duty key components sourced from Korean precision component suppliers, providing a higher-quality alternative to standard aftermarket pumps for ZX70/ZX75 applications.
Q: How to flush the ZX70 hydraulic system before fitting the new 4437197?
A: Drain the tank, clean the tank interior, replace all filter elements including the suction strainer, refill with fresh hydraulic oil and run the new pump at low pressure for 30 minutes before applying full load.
Q: How to confirm 4437197 fits my ZX70 or ZX75?
A: Verify the existing pump model is 4437197 and confirm the machine is ZX70 or ZX75. Match SAE port sizes and engine flange bolt circle. Contact our team with the serial number for cross-reference.
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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