4P-0990 Caterpillar fuel pump camshaft for engine spare part

4P-0990 Caterpillar fuel pump camshaft for engine spare part Featured Image
  • 4P-0990 Caterpillar fuel pump camshaft for engine spare part
  • 4P-0990 Caterpillar fuel pump camshaft for engine spare part
  • 4P-0990 Caterpillar fuel pump camshaft for engine spare part

Short Description:

4P-0990 Caterpillar fuel pump camshaft, the core drive shaft of injection pump for 3406B/3406C, which controls fuel delivery timing and plunger stroke.


Product Detail

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description

The 4P-0990 camshaft is installed inside the mechanical fuel injection pump. Its cam profile pushes the pump tappet to precisely regulate high-pressure fuel injection timing and fuel supply volume, ensuring stable engine power output. It fits Caterpillar 3406B and 3406C diesel engines, widely used on heavy-duty equipment including scrapers, motor graders, pipelayers and wheel loaders. It works under continuous heavy loads, requiring strict standards on surface hardness, concentricity and cam profile accuracy.

Part No.：4P-0990
Name：Fuel Pump Camshaft
Fit Models：CAT 3406B, 3406C
Dimension：L502.92mm, W114.30mm, H114.30mm
Material：Alloy structural steel with hardened cam lobe surface

Maintenance & Replacement Tips

1. Inspect pump housing bores and tappets before installation. Service worn bores to avoid premature damage to the new camshaft
2. Clean all oil passages and apply specified lubricant; never dry assembly. Align timing marks strictly to meet injection advance angle specs
3. Run test after installation, check for abnormal noise, unstable fuel supply or black smoke, correct timing errors promptly
4. Replace fuel filters regularly. Dirty fuel with particles will scratch cam lobes and shorten service life sharply

FAQ 

1. Can 4P-0990 replace the main engine camshaft?
No. 4P-0990 is an internal camshaft for fuel injection pump only, driving pump plungers. The main camshaft controls valve train. They differ in profile, mounting and load, non-interchangeable.

2. Can the camshaft be used if pitting or spalling appears on cam lobes?
It is not recommended. Spalling of hardened surface will scratch tappets quickly, leading to irregular fuel delivery, power loss or pump seizure.

3. Does it fit all 3406C engines?
It only fits 3406C equipped with mechanical inline injection pump. Electronic pump versions are not compatible. Confirm pump tag before purchase.

4. What causes large injection advance angle error after replacement?
Mostly misaligned timing marks or worn drive gears and keyways. Inspect gears and keys during installation.

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