LC200 AHC 2017 dumped all fluid from reservoir

[swiftie]

Greetings from Scotland ! Anybody got any ideas on what might have failed on my AHC as it has pumped the entire AHC fluid from the reservoir (RHS rear) over the rear axle. Obviously I will investigate but initially I wondered if this had happened to anyone else. My concern is I might have a damaged pump now.

 

[radman]

any other information you can provide? Has anyone serviced the system recently or this is completely random?

 

[lx200inAR]

Did it dump out on the left or right side as far as you can tell? There is a somewhat common hydraulic line failure that occurs over the axle on the left side (across from the pump/reservoir).


Most of the moving parts after the pump are between the axles on the left side. There is a primary trunk between the pump and the leveling valves that runs over the rear axle.

I doubt the pump is shot as long as you didn't let it run dry for a while.

 

[swiftie]

Did it dump out on the left or right side as far as you can tell? There is a somewhat common hydraulic line failure that occurs over the axle on the left side (across from the pump/reservoir).


Most of the moving parts after the pump are between the axles on the left side. There is a primary trunk between the pump and the leveling valves that runs over the rear axle.

I doubt the pump is shot as long as you didn't let it run dry for a while.

Yes I,d say left side above the axle. So we're saying that its odds on that a metal pipe has rubbed on axle/suspension ?

 

[lx200inAR]

Yes I,d say left side above the axle. So we're saying that its odds on that a metal pipe has rubbed on axle/suspension ?

edit; adding some links

I've seen two reasons it's failed around that location. One was where the main trunk and the line that goes to the rear left shock were contacting each other and rubbed a hole in the line (i may be mis-remembering exact details on this, but i think I'm close).

My AHC failed

forum.ih8mud.com

All that to say the primary failure reason is caused by rust. The main trunk line where it goes over the muffler has a heat wrap form the factory that can stay wet and cause rust underneath and the line eventually fails.

(from the same thread as above, i believe there are a few on this one dedicated to the issue)

My AHC failed

forum.ih8mud.com

 

[swiftie]

I've seen two reason it's failed around that location. One was where the main trunk and the line that goes to the rear left shock were contacting each other and rubbed a whole in the line (i may be mis-remembering exact details on this, but i think I'm close).

All that to say the primary failure reason is caused by rust. The main trunk line where it goes over the muffler has a heat wrap form the factory that can stay wet and cause rust underneath and the line eventually fails.

That makes a lot of sense, thanks. Of course in Scotland we don't have rust as its always dry & sunny ! I will investigate but it sounds as if its nothing too complicated. Thank you.

 

[lx200inAR]

That makes a lot of sense, thanks. Of course in Scotland we don't have rust as its always dry & sunny ! I will investigate but it sounds as if its nothing too complicated. Thank you.

Haha....that's exactly what I was thinking when you originally posted....i almost felt dumb suggesting it might be rust in such an arid climate.

 

[lx200inAR]

I think also there have been a few failures nearer the height control valve where the line cracked for no apparent reason at a bend in the line. I'd start there and start working back towards the pump. If you lost all your fluid, and the truck didn't drop (you didn't mention that one way or the other), then it almost has to be that run of tubing.

Also, don't do anything to lower the truck (eg. putting truck in L or driving over 100km/h), or you will dump all the fluid that is currently holding the truck up out the same hole. IF you can pull the AHC fuse so it won't open the leveling valves or run the pump while dry, it's probably okay to drive if you absolutely have to. Maybe just using the AHC Off button would work, but that sounds risky.