If the hinge will pull up with your finger nails then it will need replacing. The hinge should be tight enough to hold the blade onto the clipper. Some models are fitted with a 'Latch' which should be pushed to release the blade if this is fitted and the release does not need to be pushed then a new latch needs to be fitted.
SOURCE: oster 76
There can also be a problem with the switch, which can be gotten to by unscrewing the the 2 screws at the end of the clipper . . .you must then test (with the thing unplugged!!!!!!!!!) to see if the switch wires are good or if the switch is broken by flipping the switch and or the toggle and then checking the wires with an ohm meter (easily available from radio shack or ?? for under 10 bucks or any kid who's into electronics. If the switch is good, when its turned on resistance goes to 0, if bad th switch shoes infinite resistance on or off . . .
If it hums and the motor is turning, but the blades don't move you need to replace the gear and or lever . . see this diagram
http://www.peasridge.co.uk/clipper-advice/clippers-products-oster-a5.shtml
SOURCE: replacing a cord on an oster 76
Very simple task. The part is under $3. The schematic and parts list is located in the link.
http://www.clipperrepair.com/parts.htm?mid=106
SOURCE: Oster 76 overheating
The most likely cause of the condition you describe is that the motor is trying to run with too little current reaching it. ( Note: Voltage is the pressure pushing the electricity down the wires. Current is the amount of electricity being pushed. An easy analogy would be gallons-per-minute of flow through a garden hose. That flow is the current that is being delivered. )
If there is a built-up coating of black residue/gunk on the commutator ( the part the brushes ride against inside ), you're probably not getting the full amount of current flow needed to run the motor. Any motor will run slow, overheat, and eventually burn out if operated on current flow that is less than that required by the unit. Too small a cord, too long an extension, dirty contacts, any of these things can restrict current flow.
Pull the brushes out and look down inside. If the armature is covered in black residue, the only fix is to clean, polish, and undercut the armature, or simply replace it.
These are well-built machines, and designed to be servicable. That said, I must caution you not to attempt this repair/replacement if you have no experience in this area. It's all too easy to end up with a unit that doesn't work at all. Even worse, a unit that goes POOF and generates a cloud of acrid smoke !
Time to turn to your local repairman. It isn't a difficult or especially time-consuming job, and should be quite affordable.
SOURCE: I need a diagram of the parts assembly for oster 76 clippers
Try (at Hemp clipper repair) http://www.clipperrepair.com/parts.htm?mid=106
Hope this helps
Hope this helps, this is a tongue guide, you hopefully recognise it on your blade. If they are not paralell, then adjust them with pliers, both need to be perfectly vertical. When you put it on the clippers push the latch in as you close the hinge.
If it still wobbles then the next fe wthings need checking
1. The hinge screws on the clipper are tight, located either side of the hinge on the clipper.
2. The drive lever may be worn, thats the maroon peice of plastic sticking up at the top of the clippers, it moves from side to side when clippers are running.
3. If all seems fine up to now, your clipper should be fixed under warranty as it will involve changing parts covered by the warranty.
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