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Spare Tire Cylinder

coachgeo

Well-known member
4,929
3,314
113
Location
North of Cincy OH
Well after our tire problems I've ordered the amazon ram mentioned above. Fingers crossed.
report back your success/failure. One thing those rams will NOT have is a safety check valve like the OEM ram does. Granted the safety check valve my well be what is the issue. They prevent sudden fall of the tire if hydraulic issue occurs.

I found a possible work around if one is safety conscious person. A seat belt (or system like it used for fall protection ive seen used ones...see link below) as in a seat belt that will belay out slowly but if it goes fast (like a fall) it snugs tight.... aka- how shoulder strap of a seat belt works.

 
Last edited:

Stixsmarsh

New member
13
22
3
Location
CO
Ok, so I'm still waiting on my ram to arrive but figured I would show this.

In the meantime I wanted the spare on the truck. So I disconnected the existing faulty ram and plugged the hydraulic lines. And removed the ram so I could move the arm. I ordered a 7:1 pulley system and used that anchored off of our box corner to raise the tire into place.

For those familiar with climbing / rope work, I used 2 prusiks for assistance, one to lock the pull rope so I didn't have to hold the weight the whole time, and a second on a with a biner so I could get a grip on the thin diameter rope it came with.

PXL_20210205_224327700.jpg
 

Ronmar

Well-known member
3,185
6,477
113
Location
Port angeles wa
report back your success/failure. One thing those rams will NOT have is a safety check valve like the OEM ram does. Granted the safety check valve my well be what is the issue. They prevent sudden fall of the tire if hydraulic issue occurs.

I found a possible work around if one is safety conscious person. A seat belt (or system like it used for fall protection ive seen used ones...see link below) as in a seat belt that will belay out slowly but if it goes fast (like a fall) it snugs tight.... aka- how shoulder strap of a seat belt works.

you can buy inline velocity valves(hydraulic fuses, velocity fuses, velocity checks) that would perform the same function as the safety checks in the OEM cylinders, but they are not particularly common and not particularly inexpensive...

An even simpler workaround is to put the same sized restricted orifice as is found in the control valve into the port where the fitting is attached to the cylinder on the lowering side. Any failure in the plumbing and the descent won’t stop, but it will only continue to lower at the normal rate...

A slightly fancier option but very cost effective at $25, would be to add one of these at the same spot on the lowering(rod end) side of the spare tire cylinder. They are an adjustable restricted orifice(needle valve?) in one direction for lowering safety and control, but are unrestricted in the other(raising) direction...

 

Third From Texas

Well-known member
2,700
6,312
113
Location
Corpus Christi Texas
Ok, so I'm still waiting on my ram to arrive but figured I would show this.

In the meantime I wanted the spare on the truck. So I disconnected the existing faulty ram and plugged the hydraulic lines. And removed the ram so I could move the arm. I ordered a 7:1 pulley system and used that anchored off of our box corner to raise the tire into place.

For those familiar with climbing / rope work, I used 2 prusiks for assistance, one to lock the pull rope so I didn't have to hold the weight the whole time, and a second on a with a biner so I could get a grip on the thin diameter rope it came with.

View attachment 825332

Thinking outside the hab....err box.

:)
 
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