Guide to Removing and Installing the Engine Camshaft Gear in a Caterpillar 311F LRR – JFT Crawler Excavator

This guide outlines the process for removing and installing the engine camshaft gear on the Caterpillar 311F LRR – JFT Crawler Excavator. Follow these steps carefully to ensure proper handling and maintenance of your excavator’s engine.

Removal Steps:

Rocker Shaft and Pushrod Removal:

Begin by removing the rocker shaft and pushrod. Refer to the Disassembly and Assembly manual, section “Rocker Shaft and Pushrod-Remove” for detailed steps.
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Important: Keep all parts clean and free of impurities to avoid rapid wear and reduce the lifespan of the components.

Fluid and Impurity Precautions:

When performing inspections, maintenance, or repairs, ensure that all fluids are contained and disposed of according to local regulations.

Idler Wheel Removal:

Remove the idler wheel as described in the Disassembly and Assembly manual, section “Idler-Disassembly”.

Camshaft Gear Removal:

Ensure tool (A) is securely in place.
Remove tool (B).
Unscrew the bolts (3) from the camshaft (4).
Detach the camshaft timing ring (2) from the positioning pin (5).
Using tool (C), remove the camshaft gear (1) from the camshaft (4).

Installation Steps:

Part Inspection and Preparation:

Ensure that all parts are clean, and check for wear or damage. Replace any worn or damaged parts as necessary.

Idler Wheel and Tool Preparation:

If tool (A) was removed, reinstall it following the instructions in the Disassembly and Assembly manual, section “Idler wheel-Disassemble”.

Lubrication:

Apply clean engine oil to the teeth of the gears (1).

Camshaft Gear Alignment:

Align the timing mark on the camshaft (4) at position (V) with the timing mark on the front housing at position (W).
Position the camshaft gear (1) onto the camshaft (4), ensuring the positioning pin (6) fits into the hole (X) on the camshaft.

Gear Installation:

Confirm that the chamferals on the crankshaft gear at position (Y) are aligned between the timing marks on the camshaft gear at position (Z).
Reinstall tool (B).
Place the camshaft timing ring (2) on the positioning pin (5).
Insert and tighten the bolts (3) into the camshaft (4) to a torque of 25 N-m (221 lb in).

Final Steps:

a. Idler Wheel Installation:

Install the idler wheel as directed in the Disassembly and Assembly manual, section “Idler wheel-Install”. b. Rocker Shaft and Pushrod Installation:
Reinstall the rocker shaft and pushrod according to the steps in the Disassembly and Assembly manual, section “Rocker shaft and pushrod installation”.

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By following these detailed instructions, you can successfully remove and install the camshaft gear of the Caterpillar 311F LRR – JFT Crawler Excavator. Ensure all tools and manuals are readily available to facilitate this process effectively.

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