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CC4175 Gearbox problem??

Have a 3 year old Cub Cadet 4175. The head won't rotate. I checked and the flexible shaft is rotating down to the gearbox so I'm assuming the gearbox needs to be replaced. One of the gears apears to be worn. Is this a common problem with this trimmer. Hate to buy a new gearbox if it could be something else. Suggestions/Comments appreciated.

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Posted on Jan 02, 2017

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SOURCE: CUB CADET BROKEN SHAFT

If you have a invoice of your purchase, Check your owners manual it should have a contact for your nearest warranty agent. Give them a call, make shore you have your D.O.P and model number.Hope that helps

Posted on Jan 12, 2009

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SOURCE: Homelite strin trimmer head wont rotate

The only way to access the bottom of the metal shaft is to break it. This is fused on at the factory. It sounds like your flexshaft has twisted in two. Remove the flex shaft from the engine end and see if it is in one whole piece or is damaged in someway. If it rotates at the top but doesn't rotate at the string head this is probably the problem. However, Homelite no longer offers just the flex shaft for purchase. You would probably have to purchase the shaft and the tube as a unit.
But if you are saying the spool and string is not turning at the bottom it could be that the cup which holds the string has worn and can not longer be turned by the shaft. Replace the cup that holds the string.
Another possibility is that the shaft have moved forward, away from the engine and just need to be jammed back in, and retightened (the handle grip and the boom clamp).

Posted on Jun 17, 2009

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1 Answer

Fix the flexible drive shaft has a problem


The Metal Clamp referenced clamps directly on the end of the '2-Piece Gear Box Assembly'. The gear box assembly is an aluminum casting held together by 3 machine screws. The Metal Clamp does not actually lock the drive shaft housing into the gearbox assembly. The flexible drive shaft cable engages the engine output shaft, and the gear box assembly. This is a fixed length (non-adjustable) assembly.

First ensure that the drive shaft assembly is fully engaged at the quick connect fitting and that the "snap" is engaged. Then make sure the knob is fully tightened. The quick connect allows you to quickly switch between various attachments offered on this unit.

Now, based on your description, it sounds like the 'anti-rotation screw' 791-182519 has backed out or is gone. This will allow the entire cutting assembly (gearbox forward) to slip off of the drive shaft housing and disengage the flexible drive shaft. If your cutting assembly is attempting to rotate while in operation, or the drive is not engaged as you described.
Do not continue to operate the unit until you get this fixed as you could strip out the drive shaft end or cause other serious damage to the equipment or yourself.

If it is the anti-rotation screw, then make sure to push the drive shaft housing firmly into the gear box and ensure to align the holes in the drive shaft housing and the gear box. If the screw is lost, then find one similar sized, but be CERTAIN that it is not too long as it will actually engage the flexible drive shaft and prevent rotation, or cut the drive shaft.

Back to the clamp: If it is still wanting to move, then remove the lock nut and place slightly oversized washers on the bolt head and the lock nut. This will force more pressure (does not take much) on the clamp and will lock it down.

I just fixed mine today (071809) in fact and had to drill a new hole in the drive shaft housing as the original was completely wallowed out.

I hope this helps.

DROPNDEAL

Jul 18, 2009 | Troy Bilt Tb70ss Gas Trimmer

2 Answers

Remove the trimmer head from shaft


The entire trimmer assembly (from the gearbox forward) will slide off of the drive shaft cover. On the side of the aluminum gearbox assembly, you will find a single screw. This is the "anti-rotation screw" (do not lose this). Then remove the small (approximately 1" diameter) clamp from the end of the gear box assembly and simply pull the entire cutting assembly off of the shaft.

If you just want to remove the trimmer bump head assembly, then you will need to lock the bump head assembly to prevent rotation while you are working. If you purchased this new, then there should be a small metal rod included with your accessories. This will fit in a small hole in the base of the gear box assembly 791-182193 and prevents the trimmer head from rotating.

Then proceed to remove the following items:

791-180814B (replaces 791-180814) Bump Head Knob Assembly
791-147495 Inner Reel (hold the trimmer string)
791-610636B (replaces 791-610636) Spring
791-612026 Retainer (be careful removing this so you do not inadvertently destroy it). If you intend to reuse the trimmer head. If not, then hack, pry, stab, etc.. until you mangle it enough to remove.
791-683301 Outer Spool & Eyelet Assembly should now slide out leaving only 791-612483
Spool Shaft which I will assume that you want to keep.


I replaced my entire string head assembly a couple of years ago (and subsequently misplaced it and am in fact wanting to purchase one) and replaced it with a grass-gater or similar.

I hope this helps.




Jul 16, 2009 | Troy Bilt Tb70ss Gas Trimmer

1 Answer

Homelite strin trimmer head wont rotate


The only way to access the bottom of the metal shaft is to break it. This is fused on at the factory. It sounds like your flexshaft has twisted in two. Remove the flex shaft from the engine end and see if it is in one whole piece or is damaged in someway. If it rotates at the top but doesn't rotate at the string head this is probably the problem. However, Homelite no longer offers just the flex shaft for purchase. You would probably have to purchase the shaft and the tube as a unit.
But if you are saying the spool and string is not turning at the bottom it could be that the cup which holds the string has worn and can not longer be turned by the shaft. Replace the cup that holds the string.
Another possibility is that the shaft have moved forward, away from the engine and just need to be jammed back in, and retightened (the handle grip and the boom clamp).

Jun 17, 2009 | Homelite Mighty Lite Lawn Trimmer

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