m931 crane capacity

Anybody know the cranes capacity thats on the m931 its meant to change spare tire just curious what else i can pick up with it

allie said:

Anybody know the cranes capacity thats on the m931 its meant to change spare tire just curious what else i can pick up with it

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I was looking around to find the NSN and about all I found was an Upper Spare Tire Davit listed as PN#SS-DAK-5TM939. Couldn't seem to find the specs on it and there are some differences between newer trucks and older. The TM's don't specify a lifting capacity - but points more to its intention of lifting your spare tire.

I am sure it could lift other things but I wouldn't call it a crane. The military annually tests its cranes lifting capacity and this device isn't done that way - suggesting that it has one purpose and lifting things heavier than a spare tire might be a bad idea...

Mullaney said:

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I was looking around to find the NSN and about all I found was an Upper Spare Tire Davit listed as PN#SS-DAK-5TM939. Couldn't seem to find the specs on it and there are some differences between newer trucks and older. The TM's don't specify a lifting capacity - but points more to its intention of lifting your spare tire.

I am sure it could lift other things but I wouldn't call it a crane. The military annually tests its cranes lifting capacity and this device isn't done that way - suggesting that it has one purpose and lifting things heavier than a spare tire might be a bad idea...

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I agree on lifting more than a spare tire, but who hasnt done something that could be bad ? But which spare? A 16 is heavier than a 14, which is heavier than a 395. If a person stays around the wt. limit of a 16, shouldnt be a problem.
A person could fab up a beefier davit with a few 100 lbs more capacity though.

charlesmann said:

I agree on lifting more than a spare tire, but who hasnt done something that could be bad ? But which spare? A 16 is heavier than a 14, which is heavier than a 395. If a person stays around the wt. limit of a 16, shouldnt be a problem.
A person could fab up a beefier davit with a few 100 lbs more capacity though.

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Got to admit that if I was standing there looking at a really heavy toolbox that needed to get from the ground to the truck - yep - the davit is going to do that job! We all do it. Just hopefully not standing under the load when it gets lifted. Gotta always be ready to run just in case

Mullaney said:

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Gotta always be ready to run just in case

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Iv done that several times. looking like im a track star getting ready to take the gold, all the while doing something i know is gonna hurt or kill me if i get something wrong.

yeah i wont be needing the fifth wheel i was thinking take it off along with the wedges make a nice flat area on top of the chasis

allie said:

yeah i wont be needing the fifth wheel i was thinking take it off along with the wedges make a nice flat area on top of the chasis

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It should pick the fifth wheel no problem. I couldnt see it weighing more 600 lbs. which a 16R20 i remember reading on here somewhere, weighs in the 500-600 lbs range.

allie said:

yeah i wont be needing the fifth wheel i was thinking take it off along with the wedges make a nice flat area on top of the chasis

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So, I don't know for sure about weight. I just Web Searched "M1088 5th Wheel Weight" and came up with a NSN (part number). Not necessarily what you have and this weight includes the shipping container. I was pretty shocked with what it weighed!

From Part Target
Container Size: 42.7 X 36.9 X 15.7
Shipping Weight: 8,930.0000lbs

After all the babble, I guess what I am saying is that might be a little more weight (even if you took off a thousand pounds for the container) than would be safely lifted with your spare tire davit. My guess was a couple thousand pounds. This shows possibly three times that much...

EDIT: (one day later) The answer was found and posted below in Post #13 by porkysplace
Strongly suggest that the 500 pound limit in the TM is the magic number.

Mullaney said:

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So, I don't know for sure about weight. I just Web Searched "M1088 5th Wheel Weight" and came up with a NSN (part number). Not necessarily what you have and this weight includes the shipping container. I was pretty shocked with what it weighed!

From Part Target
Container Size: 42.7 X 36.9 X 15.7
Shipping Weight: 8,930.0000lbs

After all the babble, I guess what I am saying is that might be a little more weight (even if you took off a thousand pounds for the container) than would be safely lifted with your spare tire davit. My guess was a couple thousand pounds. This shows possibly three times that much...

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Wow!!!
from my days working on 18 wheelers in the late 90s, we used a 1tn eng hoist/cherry picker to rmv/instal them from/on 18 wheelers. I wouldnt there would be much difference in civi vs. mil fifth wheels on a 5tn tck. But i could be very wrong. Just like i didnt think the crane boom minus lift cylinders would weigh in the low 3000 lb range.
My kubota has a 3000 lb lift cap on the loader and i could pick the boom up bout 10”, and with a 600 lb 6’ shredder on the back, it still wanted pick the rear tires up enough i had to use 4x4 to move the boom.

charlesmann said:

Wow!!!
from my days working on 18 wheelers in the late 90s, we used a 1tn eng hoist/cherry picker to rmv/instal them from/on 18 wheelers. I wouldnt there would be much difference in civi vs. mil fifth wheels on a 5tn tck. But i could be very wrong. Just like i didnt think the crane boom minus lift cylinders would weigh in the low 3000 lb range.
My kubota has a 3000 lb lift cap on the loader and i could pick the boom up bout 10”, and with a 600 lb 6’ shredder on the back, it still wanted pick the rear tires up enough i had to use 4x4 to move the boom.

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I was shocked too! We had chain falls on a track - and 4 of them could lift a 5-Ton - but that isn't much help. I remember replacing 5th wheels on our road tractors and it was done with a single chain fall. Don't remember working hard to lift them either. Looking at the picture and assuming the steel frame would come off too I was guessing 3000# and it was almost double that.

Yeah, I keep eyeballing that boom and winch you have for sale and thinking those parts should be at my place. LOTS of parts there and rebuilding cylinders would be easy with "hot swap" spares. Mine work fine, but there isn't anything better than a bolt-on spare!

charlesmann said:

It should pick the fifth wheel no problem. I couldnt see it weighing more 600 lbs. which a 16R20 i remember reading on here somewhere, weighs in the 500-600 lbs range.

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I'm thinking it's a bad idea.

The A0 tire davit won't handle a super single.

I'd come up with an alternate plan.

98G said:

I'm thinking it's a bad idea.

The A0 tire davit won't handle a super single.

I'd come up with an alternate plan.

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That must be difference mullaney was talking about between the older and newer tcks. That does stand to reason since A0 were duals and possibly some of the early A1s even had the A0 davits.

allie said:

Anybody know the cranes capacity thats on the m931 its meant to change spare tire just curious what else i can pick up with it

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A1 and a2 had the bigger tire with a different tire carrier and beefed up davit to handle the weight and width.

Just for reference an a2 extended with #400 14.00 tire/wheel is noticeably unhappy. Be very gentle with 16.00’s or tires with run flats

98G said:

I'm thinking it's a bad idea.

The A0 tire davit won't handle a super single.

I'd come up with an alternate plan.

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Thanks for the info