Just fired up my new diablo, psi was set at 400, heat 240, everything is going good for about 5 min then it gets so much pressure you cannot squeeze the trigger. Turned machine off and had to crack a fitting to relieve the pressure. worked good for couple min then bam, does it again.? Blew the o-ring in the stair tool plunger. Anyone have this problem? Oh yeah , it only seems to do it when the heater is on.
I had it happen a couple of times early on. Went out and released the pressure from the bleeder line I have in the second quick connect. It hasn't happen since. I have no idea why, so if they tell you a cause let us know. Thanks.
it might be air pressure in the system. It will build up to the point it will decompress a little bit. but will keep a constant pressure. Start it up with a blank qd so it flows free to get air out. PS. secure the end of the hose to a solid object. whiplash hurts like a mofo.
I don't think air will cause this problem because the unloader should let that go just like water. It sounds like your unloader is getting hung up and not letting the water by. Remember that the pump will always deliver the same volume of water and it needs to be relieved by the unloader spring and sent into the bypass line. Always have a whip hose at the truck in the second port it is nice for getting hot water from for chems also.
Extreme heat will increase pressure over 400psi causing trigger to become difficult. Turn down heat. After valves are destroyed, next is busting of steam lines.
Problem fixed. (I hope). Called rep at Masterblend, they claim its the flow swicth to the heater. The heater is only suppose to come on when the machine is triggered. My flo swicth was sticking so heater was staying on, creating to much heat. Lucky I kept shutting it down so it did not cook anything. Anyway, you have to get under the heater and take cap off from the valve that the gray wire is going to. Remove cap, take out spring, start engine at idle and turn on pump for 5 seconds, this blows the magnet stem and debris out. put back together with slotted side of stem going in first, then sring , then cap. Pretty easy only this did not cure mine, I had to do it again and still heater was coming on without wand triggered. I had to take mine back apart and remove spring and leave it out , this did work, El Diablo is cooking right !!! They changed the valve, I guess it use to be mounted horizontally, yes you do need the spring on this type. The newer ones the valve sits upright, and gravity does the job of the spring. So I would say if your having this type of trouble and you have a hoizontal one, you might need a new valve? Or maybe replumb the thing so it sits upright? Thought I would pass this along to the board. Its all I have for you El Diablo operators. If you have any quirks with yours fill me in please!!!
Aaaaa The old flow switch- or shall or we say, detonator..... Kerosene is a great source of high heat, what's bothersome is the way Truck Mount Manufactures play around with the "safety devices" to get it to work for the Carpet Cleaning process. Potential accidents are waiting to happen (IMHO)- be it electrocution or your occasional explosion.
so they don't have a high temp. kill sensor on those things for problems like that??? that seems very dangerous to me. --Kevin--
