The reason why the diesel engine cannot crank the engine or the cranking speed is too low and how to deal with it?

The reasons why the diesel engine cannot crank the engine or the cranking speed is too low and the solutions
1. The battery is not sufficiently charged. Treatment method: Check the electronic voltage of the battery, if it is insufficient, charge the battery and replace it if necessary.
2. The main switch is disconnected. Solution: Turn on the main switch.
3. Poor contact. The line is shorted. Treatment method: Exclude any open circuit/poor contact fault, check whether the joint is oxidized, and clean if there is any.
4. Start relay failure. Solution: replace the start relay.
5. Starter motor failure. Treatment method: contact the dealer.
6. The lubricating oil temperature is low. Treatment method: Install lubricating oil heater.
7. Using the wrong type of lubricant. Treatment method: Replace the lubricating oil and filter.
8. Other reasons. Treatment method: Check whether the crankshaft can move flexibly.