Significantly Improve the Manufacturer's Suggested Duty Cycle, from Intermittent Use: ON=6min / OFF=30min to CONTINUOUS USE
My comments below are addressing these 3 issues:
1 How to permanently fix the motor overheating
2 How prevent motor thermal shut-down
3 How considerably improve the duty cycle
I am sharing this info with you with the hope it may save you some time.
Did purchase this unit from Costco about 6 years ago, in 2010.
This unit is functioning well today except its motor was overhearing and going into automatic thermal shut-down.
The ROYAL PX1201 model # is PCUA: 29127H-FE ; the Lot # 111155925.
Had to open the motor enclosure quite few times for cleanup and cooling.
Note the manufacturer's recommended duty cycle is ON=6min / OFF=30min. Nobody I know has 30min time to babysit a shredder.
In thermal shut-down mode the motor would not turn in any direction.
Today I modified the ROYAL PX1201 by adding an external 12V DC computer fan for motor cooling.
Cut a fan-placement, round, 3.25inch hole into the shredder top, at the upper right of the paper-insert slit: ____O
External, room-air is being forced into the motor-and-gear enclosure at all times, non-stop.
The paper-insert slit provides the hot-air exhaust.
The fan is an ordinary plastic PC fan: 12V DC, 0.12A=120mA, XYZ=72*72*20mm ; diagonal=101mm (hole-to-hole).
Fan cost is around $5.- and the fan power supply was a separate 12V DC adapter.
Did not have time to electrically connect the fan to the shredder's internal power supply.
Today I used the shredder continuously for 8 hours with neither overheating nor thermal shutdown.
Did fill TEN 13-gallon plastic bags with shredded paper / hand compacted confetti.
On average I shredded 6 letter-size, normal thickness pages at a time / per feed, continuous feed for about 8 hours.