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80w90 Gear oil
If you are referring to the engine motor oil, a good practice is 200-300 hours. All forklift maintenance is performed by the hourmeter. The hydraulic oil is usually changed every 1-2 years, depending on how dusty the operating environment is. The hydraulic system has several filters to clean the fluid during operation.
G32 or G36
Replace the front seal on the pump
The front seal is out on your pump. Replace the seal
oil will not evaporate as quickly as hydraulic fluid even though hydraulic fluid does not evaporate easily therefore you will not have to change the oil as often
150 to 250
A forklift generally gets it mechanical advantage from hydraulic rams, not pulley systems...
where is the drain plug for hydraulic fluid on 743 bobcat
A forklift nameplate is only required when the capacity is unknown
A hydraulic ram raises the fork frame.
You'll thin out the oil more than it already is which can lead to internal damage or even catastrophic failures of moving hydraulic parts, pumps, cylinders etc.