AHC Globes replacement --> PROCEDURE (1 Viewer)

[Maxb]

Hello, there are a few very extensive AHC related threads about the tuning, measuring/techstream, flushing etc. I am wondering if we can summarize the "procedure for the actual replacement of the globes". I am putting down some steps not knowing the sequence of steps. My apologies if this replacement procedure has already been captured in another thread... if yes, can someone point it?

FIRST DRAFT BELOW:

1- Put vehicle on in Low height.
2- Shut off the engine
3- Bleed the accumulator? (long cylindrical piece below driver side)
4- Bleed all four globes.... any particular order? Do we need to keep filling the reservoir in the engine bay to ensure there's always enough fluid during bleed?
5- System should now be fully de-pressurized
6- Remove old globes and install new ones using 36mm fan clutch wrench.... (any particular order to replace globes?)
7- Make sure there's enough fluid in reservoir
8- Start vehicle. Vehicle is still in Low height. Change height to Normal. Have a buddy keep an eye on reservoir to ensure it doesn't empty completely as the fluid level will drop as the vehicle goes high.
9- Bleed all the four globes again? Any particular order? Do this while vehicle is still in Normal? or put it in Low?
10- Etc. ........

Thanks a lot in advance.


EDITED VERSION BELOW:

1. Safety
   • Caution, do not put yourself under the vehicle as the vehicle will lower itself during the process.
   • It may be a good idea to put the vehicle on four ramps to give yourself extra room underneath the vehicle
   • May want to put on face shield or safety goggles just in case of any splatters
2. Height in Low. Change height position to LOW
3. Turn OFF the engine
4. Drain fluid from reservoir. Under the hood remove reservoir cap and take out the filter. Use a Fluid transfer pump to drain out all the fluid
5. Refill fluid in reservoir.
6. Start bleeding
   • Clear Vinyl tubing. ID 3/16”. OD 5/16”. (Inner Dia, Outer Dia).
   • Rear Driver. Careful, truck will lower itself
   • Rear Passenger. Not much will come out, linked to other side
   • Accumulator piston (a lot of fluid will come out. Truck should not sink, hopefully)
   • Front Driver: Careful, truck will lower again
   • Front Passenger
7. Replace globes
   • Order to replace? Not sure about any specific order.
   • You can start with rear Passenger or Driver.
   • Rear Driver. May need a strap wrench. You can put a duct tape around the globe PLUS use the strap wrench
8. Turn ON. Leave the height control in LOW position. Let the system send fluid to all globes
9. Turn OFF the engine.
10. Bleed. Crack bleeder screw on each corner. Just momentarily to see the fluid coming out.
11. Turn ON the engine and put the height to NORMAL position.

 

[BullElk]

Initial thoughts…
3. Before bleeding system, remove as much fluid as possible from reservoir with siphon or turkey baster. Less to bleed out from below.
4. Don’t continue to add fluid here or the bleeding will never stop. And make sure you are not under truck when bleeding system.
7. Make sure there is more than enough fluid in reservoir.
9. ?? I’ve never bled it twice before

 

[GremlinMobile]

Hello, there are a few very extensive AHC related threads about the tuning, measuring/techstream, flushing etc. I am wondering if we can summarize the "procedure for the actual replacement of the globes". I am putting down some steps not knowing the sequence of steps. My apologies if this replacement procedure has already been captured in another thread... if yes, can someone point it?

1- Put vehicle on in Low height.
2- Shut off the engine
3- Bleed the accumulator? (long cylindrical piece below driver side)
4- Bleed all four globes.... any particular order? Do we need to keep filling the reservoir in the engine bay to ensure there's always enough fluid during bleed?
5- System should now be fully de-pressurized
6- Remove old globes and install new ones using 36mm fan clutch wrench.... (any particular order to replace globes?)
7- Make sure there's enough fluid in reservoir
8- Start vehicle. Vehicle is still in Low height. Change height to Normal. Have a buddy keep an eye on reservoir to ensure it doesn't empty completely as the fluid level will drop as the vehicle goes high.
9- Bleed all the four globes again? Any particular order? Do this while vehicle is still in Normal? or put it in Low?
10- Etc. ........

Thanks a lot in advance.

Why would you keep adding fluid in step 4? How do you know when to stop adding fluid? When you ran out of bottles of fluid?

 

[Maxb]

BullElk and GremlinMobile, thank you. Since I am new to this I don't know how to do it so just putting these steps to "start" the draft. Sorry if there's anything silly being stated Updating steps 3 and 4 below.

1- Put vehicle on in Low height.
2- Shut off the engine
3a- Before bleeding system, remove as much fluid as possible from reservoir with siphon or turkey baster. Less to bleed out from below. Make sure you are not under truck when bleeding system.
3b- Bleed the accumulator? (long cylindrical piece below driver side)
4- Bleed all four globes.... any particular order? At this point my question is, if the vehicle is in Low height, and we have bled out everything, isn't there a risk of air bubbles getting into the system if the fluid level in the reservoir goes too low??
5- System should now be fully de-pressurized
6- Remove old globes and install new ones using 36mm fan clutch wrench.... (any particular order to replace globes?)
7- Make sure there's enough fluid in reservoir
8- Start vehicle. Vehicle is still in Low height. Change height to Normal. Have a buddy keep an eye on reservoir to ensure it doesn't empty completely as the fluid level will drop as the vehicle goes high.
9- Bleed all the four globes again? Any particular order? Do this while vehicle is still in Normal? or put it in Low?
10- Etc. ........

 

[BullElk]

After replacing globes and filling reservoir with new fluid, (getting system closed up again) then you will cylce fluid thru system and bleed just until new fluid is flowing out.....which is why you need more than enough of new fluid in reservoir. Now you know the system is solid fluid and no air.

 

[GremlinMobile]

BullElk and GremlinMobile, thank you. Since I am new to this I don't know how to do it so just putting these steps to "start" the draft. Sorry if there's anything silly being stated Updating steps 3 and 4 below.

1- Put vehicle on in Low height.
2- Shut off the engine
3a- Before bleeding system, remove as much fluid as possible from reservoir with siphon or turkey baster. Less to bleed out from below. Make sure you are not under truck when bleeding system.
3b- Bleed the accumulator? (long cylindrical piece below driver side)
4- Bleed all four globes.... any particular order? At this point my question is, if the vehicle is in Low height, and we have bled out everything, isn't there a risk of air bubbles getting into the system if the fluid level in the reservoir goes too low??
5- System should now be fully de-pressurized
6- Remove old globes and install new ones using 36mm fan clutch wrench.... (any particular order to replace globes?)
7- Make sure there's enough fluid in reservoir
8- Start vehicle. Vehicle is still in Low height. Change height to Normal. Have a buddy keep an eye on reservoir to ensure it doesn't empty completely as the fluid level will drop as the vehicle goes high.
9- Bleed all the four globes again? Any particular order? Do this while vehicle is still in Normal? or put it in Low?
10- Etc. ........

You're talking about the procedure to replace globes. As soon as you screw off the old globes, the whole system is open to air. You can't avoid getting air in the lines. I'd imagine you put the truck in low and bleed all globes until it's on bump stops to relieve pressure and hope that there is none left when you unscrew the globes. Either way, air will be getting in during the process.

 

[Maxb]

Edited the first post to enter the procedures after watching some videos.

 

[BullElk]

Imo, #5. needs to come after #7. If you refill before bleeding you will bleed two tanks full. Not necessary.

Press AHC to LOW pushing fluid into reservoir
Take out fluid in reservoir
Bleed four corners
Replace globes
REFILL reservoir more than you need
Crank engine so AHC pump can create pressure then raise to N
Bleed just a bit to insure air is out.
Get your bow and go hunting

And get this wrench to R/R globes

https://www.amazon.com/gp/product/B094NBP79L/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

 

[Maxb]

Imo, #5. needs to come after #7. If you refill before bleeding you will bleed two tanks full. Not necessary.

If vehicle is in LOW height setting, and you turn off the engine, then even if you refill the reservoir, as long as the engine is turned off it should not push the fresh fluid into the system... isn't that right?

 

[BullElk]

It should not push fluid with normal high pressure but it may still keep coming out due to pressure of just the fluid. Just no need to refill until new globes are on.