Causes

1. Too much pump oil

2. The exhaust filter is installed incorrectly or the filter material is broken

3. The exhaust filter is blocked

4. Failure of the oil return valve and blockage of the return pipe

Solution

1. Put out excess oil

2. Reinstall the exhaust filter or exchange the exhaust filter

3. Replace the exhaust filter

4. Check the oil return valve and clean the oil return pipe

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