Possible reasons:
(1) Oil filter blockage
(2) The oil level in the fuel tank is low, and the oil pump cannot pump oil
(3) The oil pump is severely worn and leaking.
(4) The overflow valve is damaged.
(5) Serious oil leakage in the hydraulic system (oil pipe rupture: excessive wear or aging of hydraulic seals). (6) Hydraulic oil with high viscosity cannot enter the oil or with low viscosity causes serious leakage.
Troubleshooting:
(1) Replace the oil filter or filter the oil
(2) Keep going
(3) Replace the oil pump
(4) Replace the overflow valve
(5) Replace with the appropriate oil.
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