307.5, 308, 308.5, 309, and 310 Mini Hydraulic Excavator Machine Systems Caterpillar

Removal Procedure

Start By:

1. Separate track assemblies. Refer to Disassembly and Assembly, "Track - Separate".

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Illustration 1	g00551666

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Illustration 2	g00551668

1. Pull the front idler and recoil spring assembly (1) partially out of the undercarriage frame. Attach a suitable lifting device to the front idler. Pull the front idler and recoil spring assembly out of the undercarriage frame until the recoil spring is exposed.

2. Reposition the lifting device to the front idler and the recoil spring assembly. Remove the front idler and recoil spring assembly (1) from the undercarriage frame. The weight of the unit is approximately 81 kg (179 lb).
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   Illustration 3	g00551670

3. Position the front idler and recoil spring assembly horizontally. Block the unit in position to keep the unit from falling. Attach a suitable lifting device to recoil spring (2). Remove four bolts (3) and separate recoil spring (2) from front idler (4). The weight of the recoil spring is approximately 27 kg (60 lb). The weight of the front idler is approximately 54 kg (120 lb).