Gear making a grinding noise

it could be a bad toner cartridge
try replacing each toner cartridge one by one to see if grinding gear noise goes away.
Or
it could be jammed paper somewhere inside the printer

Dear
Pl. do test as per following.
1- empty paper tray.
2- pull the toner cart. and close the door.
3- power ON the printer. Listen the sound of initial motor run,
(If smooth not grinding noise, check the toner cart OPC drum for jam. If yes check the fusser drive gear and fusser gear and assembly)
If all are ok.
4- Check the paper pick up roller shaft, (sometimes it takes a bunch of paper and jammed if you forcible pull the bunch in reverse direction the shaft may gets bend cause the grinding noise during paper pickup. in that case you have to replace the paper pickup shaft.
Thanks.

Hopefully one of the first four suggestions helped you. If not if you could post more detail as to what kind of noise is the machine making: a grinding noise, a squealing noise, how loud is it. descriptions such as that would be helpful in diagnosing the issue. Without a description of the noise any of those first four posts could be relevant. The easiest thing to try first would of course be a toner cartridge I have experienced them many times making noises especially if they're aftermarket cartridges. Other than that grinding noises are typically fuser related in that machine, with squealing and high pitch noises the description of the noise is very important because it could be a fuse or it could just be dirt in a gear cluster rubbing on a shaft or it could be the laser assembly. Ireally hate to post absolute diagnosis without enough detail especially when it comes to you having to spend more money. Hope this helps.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/charles_45d8d6c78cd9f0b6

front, rear ? I'd say fuser assembly gears or drum on toner cartridge; check the gear teeth on the toner cartridge's drum.

Un load the drum unit, check the drum/s gear, is it wear off, if so change it along with the drum's drive gear at machine base, check also the gears of developing unit

Probably worn gears for the rollers along the paper path or the gears that mesh with the imaging roller in the toner cartridge. Remove the toner cartridge and reseat it. Also look for any rounding of the gear teeth on any of the rollers while you have to cartridge out.

CHECK RS PRINTER PARTS FOR HP LASERJET 2400 2420 2430 PRINTER GEAR KIT

Power the machine on with drum and toner removed, check for noise....

It will be either the Fuser, Toner or the drum.

If it is non gen. or refill toner, fault found.

The drum is a normal consumable that you change every 3 to 4 toner cartridges, so if any of you have used more than 4 toners and havent changed the drum, I'd say that we have found your problem.

......now to the hangers on .....

Fuser, thats the hot bit at the back, these have a gear that cracks because the whole fuser assemble is old, brittle and stiff, you can pull it all apart and change the gear and be off, but soon it will more than likely break again, I know cause if I do that as the fix they come back within 6mnts.

Replace fuser, or have it replaced
LINK to P/n and price

the gear that breaks/cracks
LINK to gear info

Fuser is a HiVolt, HiTemp part. Caution!!!!

-Open the Front Cover. -Remove the Toner Cartridge -Remove the Drum Cartridge -Next locate the black gear attached to the end of the Drum and turn it with your fingers. -Check to see if the gear is locked, or difficult to turn. The gear will only turn in one direction. -If the gear won't turn at all, or if it catches while you are turning it, or if you hear the same noise when you turn the gear that you heard when the machine was on, the Drum Cartridge is the cause and will need to be replaced.

Does it only make the noise when printing. Do you hear the noise when sending out faxes? I have heard grinding noises onlt when using poor quality toner refills, or the fuser gear and or drive gear asm is stripped. First try a known good OEM toner.

I’m happy to help further over the phone at https://www.6ya.com/expert/jayw_0e86fb055a7b73de