I brought my clippers out after them being packed away for about ten or more years. They used to work perfectly and haven't had a great deal of use in their lifetime, but now when I switch them on, the motor is going quite slow. It gets slower and slower and then stops within a minute or two and then I can feel a grinding sensation about an inch beyond the removable gear plate. The machine heats up very quickly. There is no sqealing noise from it and it says on the instructions only to add oil to the motor if it does this. Any ideas what could be wrong with it. I added grease to the gears under the removable plate and it's still the same. It quickly stops even when the blades aren't attached so nothing to do with
SOURCE: Bought Oster Golden A5 clippers new but did not
There is a small gun-metal colored bar at the very rear, just below the back of the blade. It pushes inward, in the direction of the blade. Push it firmly in and pull up on the teeth of the blade. It should pop upward. You can then remove the blade from the tongue that it sits upon. When you want to put it back, slide the blade back on the tongue, then, WITH THE MOTOR TURNED ON, push the blade down to its seated position. It will click into place.
Terms regarding these devices are all too often assumed as understood. For most purposes, these are what you have to know for the A5 Oster. The cover plate is the part with two screws that has the name and other info on it. If you remove the two screws and the plate, you will see a nylon part that moves the blade back and forth--that is the lever. The other end of the lever, with a hole in it, is connected to a metal part called the link. Both parts are easily removed by simply pulling them upward from the device. The bakelite gear is the part that the link sits on (the larger hole in the link). It too can be simply pulled up off the metal shaft that it rides upon (careful not to lose the washer under it). That gear is turned by the armature gear of the motor (which is where things get much too involved to cover here, but from that point on the device very rarely has problems). Incidentally, the lever, the link, and the gear can all quite simply be replaced. They are available quite inexpensively at Amazon under Oster A5 Clipper parts (note that the one speed and the two speed take different bakelite gears, but the lever and the link are the same). If you were to replace parts such as these or simply lubricate them, remember that a good white lithium grease is recommended in light application for the gear and the shafts (lever and gear shafts and armature gear). Also, the gear shaft has a hole down its middle (and two small holes that lead to the outside of the shaft. The shaft should be filled with grease so that grease can get through those small holes to lubicate the inside of the bakelite bearing. The two pads (one on each side of the lever) should be oiled. The simple way to tell if you need to replace parts is to grip the blade end of the lever while all parts are in place and try to move it back and forth, as though it were running the blade. If there is any more than the slightest movement, replace the lever (replace that anyway if the part that contacts the blade is rounded off) link and gear.
Good luck.
SOURCE: Where do you grease and oil clippers at?
The cover plate is the part with two screws that has the name and other info on it. If you remove the two screws and the plate, you will see a nylon part that moves the blade back and forth--that is the lever. The other end of the lever, with a hole in it, is connected to a metal part called the link. Both parts are easily removed by simply pulling them upward from the device (if they are worn, they should be replaced. They, and the Bakelite gear, are available from various dealers through Amazon under Oster Parts). The bakelite gear is the part that the link sits on (the larger hole in the link). It too can be simply pulled up off the metal shaft that it rides upon (careful not to lose the washer under it). Check it for worn or missing teeth.
If you don’t have a tube of oster grease, a good white lithium grease is recommended in light application for the gear and the shafts (lever and gear shafts and armature gear). Also, the gear shaft has a hole down its middle (and two small holes that lead to the outside of the shaft. The shaft should be filled with grease so that grease can get through those small holes to lubicate the inside of the bakelite bearing. The small pads on each side of the lever (in the case) are oiled, not greased.
The bearings for the Oster are sleeve bearings that require oil (the one closest to the blade is served by the oil port; the little round chrome looking thing with the spring loaded ball in it). The other end is more difficult and would require disassembly, at which time it probably should be replaced.
Oster clippers, by the way, are known for getting pretty warm. Oster blade wash will help with that, as well as oiling the blades.
Hope this helps you.
SOURCE: Where do I put the oil in my oster a5
Find a manual for the Oster Clipper Motor here:
http://manualfox.com/link/oster.htm
Oster Hinge
A5 Latch 
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