I feel kind of stupid asking this, but here it goes. How do you check the gear oil level in a Raymond 550-OPC30TT order picker? There is a dip stick, and when we pulled it out it read low (no oil actually). So we added about 1 cup (1/4 quart) of oil in it. We checked it about 20 minutes later and it still read no oil, so we added about another cup (1/4 quart. It sat for about another 5 to 10 minutes and when we checked it again it still read no oil. At that point we had no more gear oil, so the truck was put back into production. About 30 minutes later it was brought back because it was leaking oil, sure enough there was about 1/4 - 1/2 quart of oil on the ground where it had been sitting during lunch. Obviously we did something wrong, and I feel horrible about it, I should know better. Thank you in advance for any and all of your help/tips.