Main pump pressure fluctuating or failing to cut back under load on your ZX450-3? A faulty 4658831 pump regulator loses control of swashplate angle, causing the pump to either over-pressurize or under-deliver. RITO's precision regulator restores accurate power-limit control and protects the engine from stalling.
Item NO.:
4658831-DMOrder(MOQ):
1pcsPayment:
T/T, WESTERN UNION, CHINESE BANK,PAYPALProduct Origin:
JAPANShipping Port:
Huangpu,GuangzhouLead Time：
In Stock4658831 Pump Regulator (Lifter Assembly) for Kawasaki K5V200 piston pump on Hitachi ZX450-3 excavator. The regulator reads pump outlet pressure and engine speed signals, then adjusts swashplate tilt angle to balance hydraulic power demand against engine output. Precision servo spool and calibrated spring pack maintain stable pressure-flow characteristics across all load conditions.
| Part Number | 4658831 |
|---|---|
| Part Name | Pump Regulator / Lifter Assembly |
| Compatible Brand | Hitachi |
| Applicable Models | ZX450-3 Excavator K5V200 Main Pump |
| Application | Swashplate angle control servo for K5V200 variable-displacement piston pump |
| Material | Precision-machined alloy steel spool, body and servo piston |
| Product Color | Metallic industrial finish |
| Working Temperature | -25°C~+60°C |
| Key Function | Controls K5V200 swashplate tilt angle to match hydraulic output to load demand |
| Condition | 100% New Aftermarket OEM Quality |
| Packaging | Wooden Case Reinforced Carton Neutral Packing Customized Box |
Servo spool lapped to bore clearance within 5 micrometres, ensuring fast, accurate swashplate response to pressure changes without hunting or oscillation.
Calibrated spring pack sets the power-limit curve to prevent the pump from demanding more torque than the ZX450-3 engine can deliver without stalling.
Precise spring pre-load and spool geometry maintain a consistent P-Q curve across the full operating temperature range, from cold start to full working temperature.
All mounting ports, servo piston diameter and spring specifications match the ZX450-3 OEM regulator for direct swap without pump disassembly.
FAQ
Q: What symptoms indicate the 4658831 regulator has failed on my ZX450-3?
A: Engine speed drops suddenly under light load (pump over-delivering), main relief valve chatters continuously (pressure hunting), or the machine feels sluggish and pump outlet pressure is lower than spec on a gauge test.
Q: Can I adjust the 4658831 regulator spring without replacing the unit?
A: Spring adjustment requires specialist tools and a calibration bench. Field adjustment without correct equipment will displace the power-limit curve and risk engine overload or severe pump under-performance. Replace the regulator assembly as a unit.
Q: Does a faulty 4658831 regulator damage the K5V200 pump?
A: Yes. A regulator that fails to cut back pump displacement allows the pump to operate continuously at full displacement against the relief valve, rapidly overheating the hydraulic oil and accelerating barrel and piston shoe wear.
Q: How to confirm 4658831 is the correct regulator for my ZX450-3?
A: Match the existing regulator part number 4658831 and pump model K5V200. Contact our technical team with the pump serial number for 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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