Question about Makita 7" Electronic Sander - Polisher 9227CX3

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How to replace the head gear

I have teeth broken and missing, so it sounds like it is knocking. I want to replace it, but how do you remove the old one.

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I'm going to assume your 7" is like my 9" and say that after you remove the backer pad and expose the spindle you should have access to the gearbox cover that's held in with 4 screws. if you remove those 4 screws and remove the cover you should have the bevel gear exposed.

of course the handle and guard will have to be removed to make it easier.
hold down the spindle lock when unscrewing the backer pad.

Posted on Nov 22, 2008

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Posted on Jan 02, 2017

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Engine knocking


Hi,
Good news is - I don't think you need a new engine.

As there are many moving parts that could create a knocking sound, it usually needs careful inspection to identify where it is from.
I will give a list of some of the causes and remedies. Yours will probably be one of them, but unless I was there - it could be any.

Loose exhaust component (causes rattles and thumps) - replace parts or joints.
Loose Engine mounts - Engine will move about a lot more than normal - Replacement of mounts.
Fraying Belts - causes continual ticking or slapping - Replace belts and check tension.
Timing is off - bad running, lack of power, pre ignition or knocking at low revs. Check timing belt - Replace, Tune engine.
Cracked valve - slight misfire worse at low revs - Replacement valves.
Clutch Problems - Broken spring or loose bolt - Check clutch plate - replace clutch plates.
Older engines - often accompanying smoke -
Broken Piston ring - continual ticking or occasional misfire - Replace Piston rings
Worn Piston bearings - Piston Slap - Replacement of all piston bearings.

Transmission Problems (only heard when in gear or with clutch out) - Broken gear teeth or worn bearings - Replacement of Transmission or rebuild.

Some of these remedies require engine removal and strip down, others are a simpler fix.

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I turned the gear arround and put it on backwards
doitdel
I still need a new gear since it is still missing a couple of teeth

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