Differential won't lock. model 924118 - Snowblower Forum : Snow Blower Forums
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post #1 of 18 Old 01-08-2017, 09:40 AM Thread Starter
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Differential won't lock. model 924118

Bought new in 2003. never had this problem. The black knob in photo turns pulled out and does slide back into both "lock" and "unlocked" options. My drive is a steep hill and I prefer to run it locked both up and down the hill.
I'm asking you experts for your thoughts before I try to take it apart.

Thank you,
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post #2 of 18 Old 01-08-2017, 09:49 AM
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When the Lock is in the "Locked" position, it should click into a hole on the Axle Flange. You can see if it is engaged in a hole if you look carefully. Sometimes, they are just sticky, a bit of pb blaster will loosen things up. If it is in a hole, then the Differential is Bad. If you find you need a differential, send me a PM. I have them available for reasonable money. GL.
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post #3 of 18 Old 01-08-2017, 10:02 AM
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Mine will be tough to get in when on the ground, If I roll the machine into svc position it clicks and engages instantly. Also if it's -10 or lower it's almost impossible.

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post #4 of 18 Old 01-08-2017, 10:45 AM Thread Starter
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Thanks Jack!! Like I said, the knob does move in and locks at each position. I will look closer and also check to determine if it clicks. I probably won't get back to it for a few days and will report back.
Should I try to take it apart to check differential and if so, what am I looking for to determine if differential is bad? I found online a part diagram with diff being part # 52405300.

Thanks again
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post #5 of 18 Old 01-08-2017, 10:47 AM Thread Starter
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Thanks Duff,
I did put it in the service position and sprayed Kroil in outside of black part and on the inside of wheel but still didn't lock. I'll try again this week.

Last edited by Fred9; 01-08-2017 at 11:35 AM.
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post #6 of 18 Old 01-09-2017, 09:06 AM Thread Starter
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After watching this youtube I realize I need to inspect and or pb the differential where the axle goes into it.

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post #7 of 18 Old 01-09-2017, 10:41 PM
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Good find. I've always wondered how these differentials are lubricated. Can you soak it in a penetrating solution to try to free it up?

What do guys typically do to make sure it doesn't freeze up again?

My machine:
1979 Ariens 924039 (24", 8hp w/ differential)
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post #8 of 18 Old 01-10-2017, 07:15 AM
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I may well be mistaken but I think the grease fitting on the right axle is to lubricate the inside of the axle. The left axle slides into the right one by means of the lock.
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post #9 of 18 Old 01-10-2017, 05:25 PM
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Quote:
Originally Posted by Fred9 View Post
Bought new in 2003. never had this problem. The black knob in photo turns pulled out and does slide back into both "lock" and "unlocked" options. My drive is a steep hill and I prefer to run it locked both up and down the hill.
I'm asking you experts for your thoughts before I try to take it apart.

Thank you,
If your in the locked position and knob is down as far as it goes and your tires are not both turning the same direction ( live axle / positraction ) when you spin them you have a broken lock pin. Only other thing that can cause not locking the axles into posi is the tapered pin or 1/4 bolt that holds the lock knob hub to the axle. THATS ALL IT CAN BE....
When the lock pin is engaged fully to the axle flange the differential gear is rendered useless as a differential. I have attached pixx to see all parts involved.

Fred please take a Really good look at your pin engagement, from what you describe... A broken pin is your problem. Ive broken them myself by having machine in 5th gear and slamming the drive lever down too fast.
Your knob will move as it should and and ( SEEM ) to engage & disengage, but there is no pin to lock axles together. Good luck in your repair.
Attached Images
File Type: jpg FullSizeRender.jpg (136.5 KB, 15 views)
File Type: jpg 20170110_173102.jpg (98.2 KB, 14 views)
File Type: jpg 20170110_173003.jpg (139.2 KB, 15 views)

Ariens 24" 910962 7HP
Ariens 24" 924117 Modified Pro 342cc / 15.50 GT
Ariens 32" 924044 Modified Pro 342cc / 16.50 GT
Ariens / Troy Bilt 36" Frankenblower
MY ARIENS =
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Really
Intense
Exceptionally
Nasty
Snowblower

Last edited by Shaw351; 01-10-2017 at 05:40 PM.
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post #10 of 18 Old 01-10-2017, 05:52 PM
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After reading my post it did occur to me that by a miniscule possibility the differential could be broken in the ( Open ) position, but ive never seen one in all my years of repair. They always break as shown in the video, locked up, which would make your machine a locked axle / positraction all the time regardless of lock knob position.
Here is a pixx of the differential gear taken apart, as you can see its pretty intricate. What usually happens is one of the smaller gears break or gets rusted to the piviot its mounted on, stopping the others from rotating as designed to, which in turn locks up the whole differential assembly. Hope these pixx help others to see whats going on and how there machines work.
Attached Images
File Type: jpg IMG_6570(1).JPG (173.5 KB, 14 views)

Ariens 24" 910962 7HP
Ariens 24" 924117 Modified Pro 342cc / 15.50 GT
Ariens 32" 924044 Modified Pro 342cc / 16.50 GT
Ariens / Troy Bilt 36" Frankenblower
MY ARIENS =
Awesome
Really
Intense
Exceptionally
Nasty
Snowblower
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