Common Rail Pressure Relief Valve for Isuzu 4HK1 / 6HK1 - Hitachi ZX210, Case CX210, John Deere - Replaces 8980325490

Common Rail Pressure Relief Valve — Eliminate P0087 Low Rail Pressure Codes

Your excavator replaced the injectors but still shuts down under load? Still throwing a P0087 Low Fuel Rail Pressure code? The problem isn't your fuel pump — it's this $189 valve. The Common Rail Pressure Relief Valve (also called a Pressure Limiter) is the safety device on your high-pressure fuel rail. When your injectors failed, the resulting pressure spike "popped" this valve — and now it's leaking fuel back to the return line instead of holding 26,000 PSI.

This is a Genuine OEM pressure relief valve — the exact same part installed at the factory. Replaces Isuzu/Hitachi/Case part number 8-98032-549-0 and John Deere RE516335. Do not risk your engine with cheap unbranded valves that cannot hold common rail pressure.

The Problem

You replaced your fuel injectors, but your machine still has issues:

• P0087 "Low Fuel Rail Pressure" diagnostic code
• Hard starting or extended cranking
• Engine shuts down under load
• Loss of power at high RPM
• Excessive fuel in the return line

These are classic symptoms of a blown pressure relief valve. When your injectors failed, the fuel rail pressure spiked beyond the valve's 180 MPa (26,100 PSI) rating. The valve opened to protect the rail — but now it's weakened or stuck partially open, bleeding pressure constantly.

The Solution

Replace the pressure relief valve with this Genuine OEM part. It's a 10-minute install — unscrew the old valve from the fuel rail, screw in the new one, torque to spec, and your rail pressure is restored. No fuel system teardown required.

Technical Specifications

• Isuzu Part Number: 8-98032-549-0 (8980325490) — Master Number
• Hitachi Part Number: 8-98032-549-0
• Case Part Number: 8-98032-549-0
• John Deere Part Number: RE516335
• Manufacturer: Original Equipment Supplier (Japan)
• Opening Pressure: 180 MPa (Standard Common Rail Spec)
• Application: Isuzu 4HK1-T and 6HK1-T engines
• Condition: Brand New, Genuine OEM

Compatible Equipment

Hitachi Excavators

• Hitachi ZX200-3 Excavator
• Hitachi ZX210-3 Excavator
• Hitachi ZX240-3 Excavator
• Hitachi ZX270-3 Excavator
• Hitachi ZX330-3 Excavator

Case Excavators

• Case CX210B Excavator
• Case CX225SR Excavator
• Case CX240B Excavator

John Deere Equipment

• John Deere 245GLC Excavator (Check Part # RE516335)
• John Deere 225DLC Excavator

Link-Belt Excavators

• Link-Belt 210 X2 Excavator
• Link-Belt 290 X2 Excavator

This valve fits ALL machines running the Isuzu 4HK1 or 6HK1 common rail diesel engine. If your parts manual lists 8980325490, 8-98032-549-0, or RE516335, this is the correct replacement.

Why Buy From Trenchwell?

• Save Over 50%: Dealers charge $350+ for this valve. We sell the identical Genuine OEM part for $189.
• Genuine OEM Quality: This is NOT a cheap Chinese clone. Unbranded pressure relief valves fail within weeks and can cause catastrophic fuel system damage. This is the real OEM part — made in Japan to exact specifications.
• Free Shipping: Ships fast at no extra cost. It's a small part — we want to make this an easy decision.
• Pro Tip: If you are replacing your injectors, replace this valve at the same time. It's cheap insurance to ensure your fuel rail holds proper pressure after the repair.

Frequently Asked Questions

I replaced my injectors but still have a P0087 code. Is this the fix?
Very likely, yes. When injectors fail, the resulting pressure anomaly often damages or weakens the pressure relief valve. Replacing this valve restores the fuel rail's ability to hold 26,000 PSI. It's a common oversight — mechanics replace the $2,000+ in injectors but forget this $189 valve.

Is this the same part as John Deere RE516335?
Yes. The Isuzu 8-98032-549-0 and John Deere RE516335 are the same OEM pressure relief valve. Both engines (Isuzu 4HK1/6HK1) use identical common rail fuel systems regardless of which brand of equipment they're installed in.

Can I use a cheap aftermarket valve?
We strongly advise against it. The pressure relief valve must hold 180 MPa (over 26,000 PSI). Cheap unbranded valves from overseas often fail to hold this pressure, leading to chronic low rail pressure, poor performance, and potential engine damage. The cost difference between a genuine OEM valve and a knockoff is not worth the risk to your engine.

How do I install it?
The pressure relief valve threads into the common rail. Relieve fuel system pressure, unscrew the old valve, install the new one with a new sealing washer, and torque to spec per your service manual. The entire job takes about 10 minutes with basic tools.