Newbie Alert! New LMTV in DFW

[IronhorseTX]

To clarify, the reservoirs are full but nothing is happening after hand cranking. I’ve been checking to make sure the reservoirs are full after 5 mins of cranking each time.

 

[Ronmar]

Once the pump is pushing fluid, it does not take all that many pumps to make anything move if things are working right.

again, this could be as simple as the hoses are connected backwards on one of the pumps…

that is a good idea to confirm pump operation, connect a cylinder directly to the hand pump output port.

You could raise the cab this way, by connecting the output line from the hand pump to the port on the frame rail that feeds the base end of the cab cylinder and the cab latch. It is on the frame rail near the front of the fuel tank…

unfortunately lowering the cab afterwards is the advanced class and will be a little messy as you would then have to loosen a fitting(BUT NOT REMOVE IT) enough to allow fluid to leak out slow enough to not trip the cab safety with too much flow. Once the fitting is loose, you must push the cab back over the balance point and it will come down as the fluid leaks out of that loosened fitting.

How loose does the fitting need to be? good question. I guess you could learn this by lifting the cab a few inches with the hand pump then loosen the output fitting on the pump to let the fluid leak out and practice lowering the cab that way till you get a feel for what is needed… You will need something under the pump to catch the fluid… Messy but it would work.

 

[IronhorseTX]

Hey Folks, just now getting back out to work on the truck today, day job getting in the way.

question: does the hand pump work for both the cab tilt and the wheel lower? As I’m testing the what’s working and what’s not, I didn’t know if the manual pump powers both functions.

 

[Mullaney]

Hey Folks, just now getting back out to work on the truck today, day job getting in the way.

question: does the hand pump work for both the cab tilt and the wheel lower? As I’m testing the what’s working and what’s not, I didn’t know if the manual pump powers both functions.

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Yes. One pump lowers the spare tire and raises the cab.

Turn the knob on the manifold to engage which ever one you want to activate (raise of lower)

 

[IronhorseTX]

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Yes. One pump lowers the spare tire and raises the cab.

Turn the knob on the manifold to engage which ever one you want to activate (raise of lower)

thanks - that’s what I thought! Just wanted to make sure.

 

[Ronmar]

Yep, both pumps are in parallel. I did a system pressure test video and disconnected the output line on the hand pump and connected it to a pressure gauge. This showed me system pressure generated by the AOP while raising the cab and spare tire.

thats why I suggested your hydraulic issues could be as simple as someone connected one of the pumps backwards as this would send the pressure from the pump you are using, right into the reservoir of the other pump…