Fuel Injection Pump 326-4635 for Caterpillar CAT Engine C6.4 Excavator 320D 320DFM 320DGC 320DL 320DLN 320DLRR 320DRR 321DLCR 323D 323DL 323DS
This fuel pump is engineered as a direct replacement for the Caterpillar CAT Engine C6.4 Excavator 320D 320DFM 320DGC 320DL 320DLN 320DLRR 320DRR 321DLCR 323D 323DL 323DS. Manufactured to meet or exceed OEM specifications, it delivers reliable performance in demanding conditions. Each unit is tested for fuel flow, pressure rating, and durability before leaving the factory to ensure consistent quality across every order.
Vehicle Compatibility
| Application | Details |
|---|---|
| Caterpillar | See product specifications |
| CAT Engine: C6.4 Application: Fit for | See product specifications |
| CAT Excavator:320D, 320D FM, 320D FM RR, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 320D RR FM, 321D LCR, 323D, 323D L, 323D LN, 323D S, 323D SA | See product specifications |
Replaces OEM Part Numbers
326-4635 • 32F61-10302 • 3264635 • 32F6110302 • CA3264635 • CA10R7662 • 10R-7662 • 10R7662 • CA2959126 • 295-9126 • 2959126 • 32F61-10301
Signs You Need a Replacement
If your equipment is showing any of these symptoms, the injection pump may be the cause:
- Engine cranks but won’t start — The pump may have lost prime or stopped delivering fuel. Check for fuel at the filter outlet before replacing the pump.
- Stalling under load — A weak pump can’t maintain pressure at high demand. The engine runs fine at idle but dies when you put it to work.
- Fuel pressure warning (if equipped) — Modern Caterpillar equipment monitors fuel rail pressure. A low-pressure warning often means the pump is failing.
- Loud whining from fuel system — A failing pump makes a high-pitched whine that gets louder as it warms up. Normal pump noise is a low hum.
- Air in fuel lines — If you see bubbles in the transparent fuel line or the primer bulb won’t stay firm, the pump may be drawing air through a worn seal.
- Excessive return flow — Too much fuel returning to the tank instead of reaching the injectors indicates internal pump wear.
Before You Replace the Pump
Before replacing the pump, check the fuel filter and fuel lines for restrictions. A blocked filter causes the same symptoms as a failing pump on Caterpillar equipment. When installing the new pump, fill it with clean fuel before connecting the lines — this reduces priming time and prevents dry-run damage. After installation, bleed the system fully and check for leaks at all connection points. Replace the fuel filter at the same time as the pump to protect the new unit from debris.
Frequently Asked Questions
Will this fit my Caterpillar 320D?
Yes. This part is designed to fit the Caterpillar 320D, 323D among other models listed in the compatibility table above. Verify your specific model and engine code before ordering to ensure the correct fit.
Can I cross-reference 326-4635 with 32F61-10302?
Yes. Both 326-4635 and 32F61-10302 are interchangeable OEM numbers for this part. They refer to the same component with the same specifications, just different part number revisions.
How long does a Caterpillar fuel pump typically last?
Fuel pump life varies by application, but on Caterpillar equipment you can generally expect 5,000 to 10,000 hours of operation. Running the tank dry, using contaminated fuel, or neglecting the fuel filter are the top causes of premature failure.
What tools do I need to install this on a Caterpillar?
Standard metric hand tools will handle most of the job – sockets, wrenches, and a torque wrench. For Caterpillar equipment, check the specific service manual for any special tools or torque values.
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