HP laserjet M2727nf does not seem to print on both sides, when it goes to print the back of the page it grinds and then stops

SOURCE: HP Color Laserjet 2840

You might find that it is the gear driving the fuser, these plastic gears get very worn when driving the ceramic fuser gear. Right Rear plate assembly RG5-7580 with the gears that connect the fuser motor to the fuser.

SOURCE: my HP LaserJet 4L printer just makes a grinding sound-won't print

That printer has a gear on the motor that cracks. You can fix it with a new or used motor. Or get a different machine on craigslist. Thank you, Steven 805-520-3003

SOURCE: My HP LaserJet 4L printer just makes a grinding

Common issue with these older 4L printers. The problem is a small plastic gear on the main drive motor has cracked. This is what causes the noise and since the machine is not "running" there is no paper feed and thus the paper jam light. Basically there is no drive to any of the printers components. May be hard to find a replacement motor these days but that is what you would need to fix the printer.
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Seeker5211

• 1089 Answers
• Posted on Nov 23, 2010

SOURCE: HP Laserjet P3005dn printer makes a loud grinding

Replace the fuser and the fuser drive gear. When you order the fuser make sure that they include the gear.