Gto 52, motor problem

Hi could anyone please help me in understading whats wrong with my motor. We recently changed the back pulley ( not on the motor, the one that the belt runs from the motor to the machine) . Firstly we have this machine for about 5 years and we always run the machine at 8000sph and neva had problems. The problem i am having is that when we run the machine, after about 3 hours of running at 8000sheets per hour , the motor is absolutely hot and theres a screaching noise that we here from the belt or motor while running. When we stop the machine to clean the plate and blanket, the forward inching comes to a point where we press the inch button and the press does not move. The backward inching works but very very slow. We now do not use the inching and turn the machine with the manual handle. This handle is also quite hard to turn. Its like as almost tight to turn like when the brakes is on. My electrical guy has check electrically and says there is nothing wrong with the inching contacts. I agree with him cause when we start up the machine every morning the inching works marvelously. The inching gets tight just after about 2 to 3 hours of running when the motor is hot. Back to the noise that i get when running the machine, after about 2 - 3 hours, this sharp screaching noise is there for about a min then go's away and starts couple min later. That is the process for the whole day. My mechanic has greased and oiled the necessary parts and checked the brakes and it is working perfectly. However when the machine is running at 6000sph the noise is there but very faint. Finally about a week later my belt snapped and i had to replace with a new belt. With the new belt the machine worked perfectly for a couple of hours ( Inching worked perfectly, No Noise on the belt, No heating of the motor and the manual handle for turning the press was so loose that you could turn the press with just your thumb and index finger). Then the same problem started again. This week i got my mechanic to take out the motor for inspection. According to him the motor is getting damaged by somethng and he says its an electrical fault. I feel that the back pulley is not alligned properly to the motor and thats the reason the belt gets hot and so does the motor and causing a wear on the belt. Has anyone experienced this problem. Please help as my mechanic has no more options other than it could be electrical. Thank you

 

Hello Paven

not been on a GTO in a while so bear with me. But off the top of my head, if the Handle is tight when you try to tun the Machine Over By hand, it does suggest that its a Break issue.

One thing you could Check is if you open the Electric panel on the Op Side of the Press i think their should be 3 Sets of Fuses (this is all off the Top of my Head no So some if it maybe Wrong) one of them are for the Break, Cant emember Which one, But just check all the Fuses for Continuity if one of them doesnt have continuity change it, and see if you can cank the press

hope this helps

 

Hi Rolandman

Thank you for the reply. I will check on this as soon as my motor is installed. One more thing... On the motor there is a handle for the break. I do not know how this works but i noticed that handle has fallen of and i cannot put this back. Could there be a fault in there somehow? thanks again for the reply

Regards
Paven

 

The handle on the brake is only use to turn the machine by hand without power, doubt this is your problem. Alligment of the belt on GTO is almost dummy proof. There should be blocks the hold down the main motor plate that also allign the motor laterally, this could be an issue but doubt it. The screeching you are hearing is at high speed is probably caused by a loose drive belt. What I would do is run the machine, when the belt starts to screech pull on the handle on the brake and see if the noise goes away, it is possible that the brake is dragging and bogging down the motor, ive never seen this but i guess its possible. Next I would turn the machine by hand, Is it unreasonably hard to turn? Then take the belt off, in theory it should be no easier to turn the machine without the belt. If it is still diffucult to turn the machine without the belt you could have a cylinder bearing, or occilator bushing that could be going bad.

 

Hi exheidmech

Thank you for the reply. One thing i forgot to mention is that when my belt snapped and i had to replace, the press turns very easily when there is no belt on the motor. Any idea if this could help bring me closer to the problem? Thanks

 

If the press turns easily and your belt still snapped that tells me the tension on your belt was set incorrectly. A belt is not going to break as a result of a machine that turns freely. Usually if a belt squeels its because its too loose.

 

Exheidmech thank you for the reply. I will check with my mechanic. Yesterday my mech and electrician was here. They finally figured out that the break on the motor somehow is holding sometimes. The motor has been sent back for repairs. When i do get the motor back and the problem persists i will give my mechanic the advice you have given me. Thank you so much.

Paven