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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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