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4447726 Hydraulic Pump Wiring Harness for Hitachi Excavator ZX450 ZX450H ZX500LC
Part number 4447726 is the Hydraulic Pump Wiring Harness used on Hitachi ZX450, ZX450H, ZX450H-HHE, ZX460LCH-AMS, ZX460LCH-HCME, ZX480MT excavators. This aftermarket replacement from TOPARTS is designed to fit in place of the original without cutting, splicing or rerouting.
What This Harness Does
The hydraulic pump harness connects the pump controller with the proportional solenoids, pressure sensors and swash plate control on the main pump. It is how the electronics tell the pump how much flow to deliver and how the controller learns what the pump is actually doing.
On electronically controlled hydraulic systems, pump output is constantly adjusted to match engine load and operator demand. All of that adjustment happens through the signals travelling along this harness, so its condition has a direct effect on digging power and fuel economy.
Hitachi excavators are popular on the used market, and harness replacement is one of the most effective ways to restore an older Hitachi to dependable everyday use.
Installation Guide
- Relieve hydraulic pressure and let the system cool before working near the pump.
- Wipe oil residue off connectors before unplugging them.
- Check the pump solenoids and pressure sensors for damage while the harness is out.
- Secure the new harness away from hot hydraulic lines with the original clamps.
Construction and Quality
We check connector fit, wire continuity and overall layout before shipping, so the harness you receive is ready to install. The materials are chosen for the temperature range, vibration and contamination found on construction equipment.
FAQ
How do I know it will fit my machine?
Match the part number on your old harness, or send us your machine model and serial number and we will confirm before you order.
Is this harness plug-and-play?
Yes. It is built to the original layout with matching connectors, so it installs in place of the original without cutting or splicing.
Can I replace only part of the harness?
For a reliable result we recommend replacing the complete harness, since the rest of the old wiring has aged under the same conditions.
How to Tell It Is Time for a New One
Common warning signs are:
- Higher fuel consumption than normal
- Pump or solenoid fault codes on the monitor
- Hydraulic functions feeling slow or weak
- Oil-soaked or heat-damaged wiring around the pump
When diagnostics point to a circuit fault rather than a failed component, replacing the wiring is often the most cost-effective repair.
Planning the Repair
Dealer lead times for wiring harnesses can stretch to weeks. Ordering a replacement in advance, or as soon as faults begin to appear, keeps your project on schedule and avoids rental costs for a substitute machine.
Specs at a Glance
- Part Name: Hydraulic Pump Wiring Harness
- Part Number: 4447726
- Condition: Aftermarket new
- Product Weight: 2 kg / 4.41 lbs
- Brand: TOPARTS
- Warranty: 12 months
- Feature: Original connector layout; plug-and-play installation
Application
Hitachi ZX450, ZX450H, ZX450H-HHE, ZX460LCH-AMS, ZX460LCH-HCME, ZX480MT, ZX480MTH, ZX500LC, ZX500LCH, etc
Ordering Information
- Payment Method: PayPal, Stripe, Credit card, Visa, etc.
- Shipping Method: DHL, FedEx, UPS, TNT, USPS EMS, etc.
- Track Your Order: An email containing the tracking number with a link will be sent to you as soon as it ships.
Note: Please verify your part number and match our product pictures to your original item before ordering. If you have any questions, please feel free to contact us. Thanks.
