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Check the solenoid valve on the rinse piping at the top back of the machine. shut water off and take the coil and the top off of the solenoid, carefully remove the innards (so as not to lose them and to remember how they went together) check for debris inside and clean out. Put it back together and try it. If that doesn't work, you will need to replace the solenoid valve. Cost is around $100 at Grainger for a suitable valve or if you want factory part, it is around $350 from Hobart.
I assume you mean the (smaller) rinse arm? You most likely have debris inside your water fill solenoid valve. Turn off water supply and disassemble valve carefully to avoid losing parts and clean out valve, you can also crack water supply to flush it out briefly while solenoid is apart. reassemble in same order that it came apart and try it again. If that doesn't fix it you need to replace solenoid valve. $100 at Graingers or $350 from Hobart.
Check that your supply faucet is open, Check if there is a screen in the supply line, these can become blocked due to scale deposits from the mains. If there is no screen check that the inlet solenoid valve has not got blocked. If none of the above help, check that there is power getting to the solenoid valve when the machine is supposed to be on the fill cycle. If no power is getting to the valve, the timer might be faulty. (You can try hand filling the machine and see if it goes through a cycle, at least up to the rinse stage, this will tell you if the timer control is working).
The WM-1D does not have any internal heating devices. You have to supply the machine with the proper water temp. It has two fill valves, one for wash and one for rinse. It should have 150F supplied to the wash fill valve and 180F to the rinse fill valve.
ck. flow press. of water , when fill solenoid opens press. should be @20 p.s.i because this is a time fill machine. this is important .not static press. flow press. also ck the screened washers in the fill hose to see if they are plugged .let me know what you find so i can futher assist. dont forget to vote tks
If i remember correctly, a KD7 was built in the 70's or early 80's, we used to service them before being sold to Inglis. Seeing it uses the same water solenoids to fill, and asuming it is filling ok, I would suspect worn arms and hubs. If it doesn't fill completely, the fill valve coils may be opening when they get hot from the water flow. The fact that you need a new rack would indicate wear thhoughout and may be too old to justify repair. Find your local Inglis dealer to check on parts availability.
Todd - A pressure regulator will REDUCE pressure only. There is no back pressure - the machine's gauge is reading the incoming water pressure as it fills/rinses. Assuming the gauge is OK, the machine is only seeing 7 psi. There is an inline strainer in teh machine, check that for blockage. You said the machine was operating on 45 psi with a reading of only 12 psi. There may be some kind of pressure reducer - I have seen Hobart use special supply hoses with builtin orifices.
hope this helps, if not email me, i service commercial machines and came across your question as I was looking for help myself!