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Old 10-11-2021, 08:51 PM   #1
Mini-Skoolie
 
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Broke both rear shocks off

Was driving for the past 2 days, noticed the bus was bouncing a lot more than usual.

Looked under the bus at the rear shocks and the top bolt of one and the bottom bolt of the other was sheared off.

What do you supposed caused that.

I just had the shocks replaced 2 months ago. The shop put Monroe shocks on.

Kevin

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Old 10-11-2021, 09:38 PM   #2
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The shock is

Too long or too short.

In other words,,, it is the wrong shock.

Or perhaps you are missing a bump stop.

My bet is wrong part.

William
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Old 10-11-2021, 09:40 PM   #3
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Not enough air in the shock. Causing it to bottom out (hard).

Pivot bolt not torqued. Too much play can cause a break.

Or just the wrong shocks, as William suggested.

I attached a list of Monroe school bus shocks which may be helpful in identifying whether or not the parts installed are correct.
Attached Files
File Type: pdf 2021-MonroeCV-SchoolBuses.pdf (1.00 MB, 12 views)
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Old 10-11-2021, 10:56 PM   #4
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I vote wrong shocks. see if they have the old ones and do some detective work, you shouldn't be liable and have to purchase new ones they do.
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Old 10-11-2021, 11:28 PM   #5
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Quote:
Originally Posted by sportyrick View Post
I vote wrong shocks. see if they have the old ones and do some detective work, you shouldn't be liable and have to purchase new ones they do.
I left that service shop a few months ago in cape cod
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Old 10-11-2021, 11:28 PM   #6
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Quote:
Originally Posted by DeMac View Post
Not enough air in the shock. Causing it to bottom out (hard).



Pivot bolt not torqued. Too much play can cause a break.



Or just the wrong shocks, as William suggested.



I attached a list of Monroe school bus shocks which may be helpful in identifying whether or not the parts installed are correct.
Thanks...I'll check in the am
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Old 10-12-2021, 09:03 AM   #7
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Quote:
Originally Posted by DeMac View Post
Not enough air in the shock. Causing it to bottom out (hard).

Pivot bolt not torqued. Too much play can cause a break.

Or just the wrong shocks, as William suggested.

I attached a list of Monroe school bus shocks which may be helpful in identifying whether or not the parts installed are correct.
That pdf does not list air shocks.

Not surprising as shock mounts are not built to be load bearing components of the suspension. That is true for most vehicles.
It amazes me that some ambulance chaser has not sued the air shock sellers out of the business of selling them.
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Old 10-12-2021, 12:26 PM   #8
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As it turns out, the shop in cape cod installed the wrong shocks.

That cost me $1200 for new shocks and a shock mount
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Old 10-12-2021, 05:55 PM   #9
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I would stay in touch with that shop, maybe head out that way when the weather improves. That $1200 is on them
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Old 10-12-2021, 07:21 PM   #10
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Quote:
Originally Posted by kevinstotz View Post
As it turns out, the shop in cape cod installed the wrong shocks.

That cost me $1200 for new shocks and a shock mount
GD!
$shocks are what? less than $100 a piece last I looked.
Install time is what? 5 mins each, last I did them.
That is one hellava shock mount.
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Old 10-12-2021, 07:29 PM   #11
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Quote:
Originally Posted by kevinstotz View Post
As it turns out, the shop in cape cod installed the wrong shocks.

That cost me $1200 for new shocks and a shock mount
I'd be filing a suit right about now.
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Old 10-12-2021, 07:31 PM   #12
Mini-Skoolie
 
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Quote:
Originally Posted by Mountain Gnome View Post
GD!
$shocks are what? less than $100 a piece last I looked.
Install time is what? 5 mins each, last I did them.
That is one hellava shock mount.
Ya. It's expensive..
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Old 10-12-2021, 08:34 PM   #13
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Shocks were an hour job on my dev bus when I got it and they were rusty crusty been on for 20 years look!! And still only an hour
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Old 10-12-2021, 08:38 PM   #14
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Ya. It's a typical scenario..
The bolts sheared off. Stuck in the support and upper mount.
I could drill and work them out. But doing so in a park is not real nice place to work.
We have been on the road for 5 months.

I am Capturing j1939 data though.

Priorities.

Kevin
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Old 10-17-2021, 05:09 PM   #15
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If it’s airbag suspension, if you don’t let the bags fully inflate you will bust off the shocks.
Unless the wrong shocks were installed. But if the bags don’t fully inflate you will bust the shocks.
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Old 10-17-2021, 05:15 PM   #16
Mini-Skoolie
 
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Hmmm...how does one know if the bags are fully inflated?

The CIT trucking said the wrong shocks were installed.
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Old 10-17-2021, 07:19 PM   #17
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Run the air compressor up to 100 Lbs and climb u fee the bus amd look at them. At 60 psi the alarm stops, sure you can drive but the bags won’t be fully inflated.
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Old 10-17-2021, 08:27 PM   #18
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the bags dont even start to inflate until the alarm stops (if the protection valve is working like its supposed to)
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Old 10-17-2021, 10:49 PM   #19
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Ah, yes, if that's the case, then the bags were full. The air pressure is never less than 90 while I'm driving
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Old 10-18-2021, 06:12 AM   #20
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Never less? It should be around 120psi. I’d inspect and do a R&R on the whole air system. What’s your leak down test look like?
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