[APWS]

hi guy's
cleaning a tarmac car park today  using my posiden 5-67 washer, everything was going fine when all of a sudden i lost pressure, the lance started shuddering it felt like there was an air lock in the system, checked to see if the nozzel was blocked it was'ant,
cheecked the water inlet filter that was fine as well, even tried pulling the trigger on & off several times to try and force the air lock out if that was the problem but no joy, when not pulling the trigger the machine was running fine and the up loader valve was working ok,
any idea's guy's,
thanks.
jim.

[trevor perry]

could be a bit of muck stuck in one of the valves on your pump

[Matt Gibson]

I had the same problem a while ago except i lost pressure and it was surging. someone gave me the advice that trevors just given, cracked the nuts to clean the valves and two had broken apart.

[APWS]

Thanks for the replays chaps,
I took my other machine on Sunday
(tech-clean 250) and it appeared to
Have the same trouble,
Could be one of my hoses are damaged
Will check this week if not I will look at the valves.
Cheers,
Jim.

[Matt Gibson]

If both machines are doi g it, it sounds like a water feed issue. same thing happens when my tank gets to empty.