3056E Industrial Engine Caterpillar

Removal Procedure

Start By:

1. Remove the front cover. Refer to Disassembly and Assembly, "Front Cover - Remove".

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Illustration 1	g00943846

1. Rotate the crankshaft until the timing marks on the crankshaft gear, the camshaft gear, and the idler gear are aligned.
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   NOTICE
   The valve timing and the fuel injection pump timing will be lost if the crankshaft is rotated when the idler gear is removed.

2. Remove bolts (3) from idler gear (1).

3. Remove idler gear (1), retaining plate (2) and the idler gear hub. If necessary, remove the bushings from idler gear (1).

Installation Procedure

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Illustration 2	g00943872

1. Position the idler gear hub and install bolts (3) in order to locate idler gear hub (5). Tighten the bolts in order to seat the idler gear hub.

   Note: The Lubrication Hole (X) of the idler gear hub must be positioned at the top of the idler gear hub.

2. Use a suitable press and Tooling (A) to install bushings (4) on each side of idler gear (1).

3. Remove bolts (3) from the idler gear hub. Install idler gear (1) with the timing marks toward the front on idler gear hub (5).

   Note: Ensure that the timing marks on the crankshaft gear, the camshaft gear, and the idler gear are aligned.

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   Illustration 3	g00943846

4. Install retainer plate (2) and bolts (3). Tighten the bolts to a torque of 44 N·m (32 lb ft).
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   Illustration 4	g00944081

5. Check the end play for the idler gear. The end play for the idler gear is 0.10 to 0.20 mm (0.004 to 0.008 inch).
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   Illustration 5	g00944084

6. Check the backlash between the idler gear and the camshaft gear. The backlash for the gears is 0.052 to 0.107 mm (0.0020 to 0.0042 inch).

End By:

1. Install the front cover. Refer to Disassembly and Assembly, "Front Cover - Install".