Each model will differ slightly and it is always advisable to check your operating manual for exact instructions. There is no strict rule that determines when you should change the oil on your forklift but there are a few telltale signs it needs changing.
- The old looks dark brown or black
- The engine sounds louder than normal
- The exhaust fumes are black and sooty
Forklifts are a big investment so checking fluids is important. To check the oil
You should only check the oil after the engine has had a chance to cool down and return to the galleries / cylinder head valleys to avoid any misreadings.30-45 minutes should be ok.
Park the forklift on a flat, level surface and open the hood to locate the oil dipstick which should be clearly marked ( use the owners manual for exact location ). Hook your finger through the dipstick loop and pull up to reveal the metal stick / gauge. Use a rag or paper towel to remove and oil on the stick, then re-insert as far as it will go. Remove once again and this will give you a reading. When done replace the dipstick. The dipstick will have markings a low and high marker. if low then top up your oil until the correct level is achieved ( again check your manual ).
While your at it you should also check coolant levels, brake fluid and/or power steering fluid