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looks like i have 400hz

So when you say A2, A24, etc., are you referring to their label on a wiring schematic? Im still working on deciphering it. Worries me though with other people having their greedy little hands in this and just rigging it… So remember that pesky Idle/Run switch? So it is the one on the right in...

So the GPU box is a Hobart TR-1528, snagged a manual and was going through it. The panel is missing a switch so referenced the manual and viola, its the main contactor switch...well thats a good place to start on why there's no DC output from the box haha.

Yeah i don't think i have access to anything but an airplane that could actually stress test this unit.

So…what can i plug into this other than a coffee maker(from a previous post lol) that incan test without burning it up, any ideas? Haha Sent from my iPhone using Tapatalk

Yeah i think youre right for it being an air leak source, and also correct on the location, that is from the fuel selector to the first pump. So cleaned out everything, new filters and it will run. Remember that IDLE/RUN toggle on the front i told yall about? Well it will change the rpm from...

So when i very first got it running, the charge voltage was one of the first things i checked and it showed like 34vdc, i had to manually turn down the output to like 26v. I have a feeling the alternator needs to be replaced since even after lowering the output it had voltage creep past the...

So the one that isn’t running, if i take it apart and clean it then it should work again? That has literally never happened to me with fuel pumps haha. I have gasoline sitting in the filter housing overnight to help clean it. On another note, how important is the bus fuse on the back of the...

Well the filter canisters were deff nasty, water inclusion and stuff, only the rear pump is working, easy options for jut removing them and going to a more readily available shelf item that functions the same? Also, best gasket replacement for the canister lip?

If i had to guess, the AC from the wires im pointing at(which are doubled onto the wires going to the main connection terminal) goes into the 28vdc control box and is stepped down…

Yep only to start airplanes, that's it.

It is a 400hz unit, and yes we are at an airport. The usefulness of the 28vdc 1000amp starting power is the end use of the unit, there is no planned usage of the AC generation power.

Thats a lot of good points. Some diesel injection pumps will pull past INOP pumps so wasn't sure if that applied to this model. So this is the problem with getting something second hand, the IDLE-RUN switch i'm talking about looks like its the LOCAL-REMOTE switch in the manual, IDLE and RUN is...

They left the diagrams, all they did was paint the outside, interior is still OD Green. So with direct power the pump towards the rear(control panel) runs, but the front(towards radiator) does not. Bought new filters today so will test that. With start switch in RUN and BATTLE SHORT-ON...

Hello group, my partner snagged a MEP0114A GPU for me to fix and get running (was retrofitted with a 28v DC starting unit for aircraft by Hobart for probably the Air Force, the Hobart tag has a contract and NSN number). He purchased from an airport FBO that had it sitting in their boneyard for...