I'm reparing a C30L, the problem is with lift hoses, the tower has this serial number: 45dmq8860 0001M 2807290, We change the hoses every two or three weeks. When the tower goes up or down the hoses moves out the hose reels and they pass around the gears located in the midle of the tower, then we look... and the hoses have an oil leak. I want to know if the tower has manufactured defects or...if you know what can i do to make work the reels and the hoses property?