Well, i just got my transmission fixed and my first pump job i had a problem. Got to the job the out riggers worked and boom function but not the agitator. Then i tried the concrete pump and nothing. No wireless or local at the back panel. My hand valves for ag and pump did however work. So i pumped the job with someone working the pump handle and rope tied off the ag to work. Started out fine then I lost the volume on the concrete. It went down to a slow pump, lucky it was only 20 yards. I lost volume to the main pumps (concrete). i got the job pumped. Took a while to suck the sponge but bagged it and got it through. Anyway I got back to the shop and called Woody and George at Schwing (Can't say enough good things about Schwing tech. support) After some diagnosis we found out that I lost AIR TO THE HANDLE VALVES. Yes if you ever wondered what that air gauge on the frame is. It runs the black and white function which is the C pump and AG. also affects the stroke limiter. I found out there is an emergency leak valve on one of the brake tanks that got clogged, air supply for the valve. I gave it a rap with a wrench and WA LA I got air to the the gauge and life was good again. Just in time for the next pump job.

Good Info BAlto, glad you got the problem figured out with a little help from your friends at Schwing.

Brian, the stroke limiter is not tied into the air system, if you have a problem adjusting the volume/strokes, you have another problem (hydraulic) besides the air leak;

I'm still not sure why the stroke limit didn't work? I think it may of had something to do with running the agitator valve at the same time as the pump valve or maybe my stroke limiter was clogged. I had a NEW SCENARIO TODAY that ties will the same problem. My first pump job the ROCK VALVE WAS SLOW, i pumped the job out then called Schwing again. Woody and I (mostly Woody) found that the manual stroke limiter is directly tied to the shift cylinder, I never knew this but it NEEDS TO BE SPUN ALL THE WAY OUT! for the rock to shift properly. Yes, I did this and my rock opens very quickly and fully. Like a new machine.

what pumpkit do you have on this truck?

BPL 1200 single stage. No accumulator. The way Woody explained it was the switching cylinder takes its pressure from the highest level of the two (electric stroke limiter and manual). If you are pumping slow you get low volume speed to your rock. If your manual is turned up even if your not using it, your rock gets full pressure. I had mine turned down from yesterdays venture with the air line. my rock had very little power and speed. I turned the manual stroke all the way out today and it gave great power to the rock, and my electric stroke still works normal.

OK Brian trade and get a PUZT.

the electric stroke limiter can only work with pressure available from the manual stroke limiter; on the stroke limiter block, your manual stroke limiter is first in line and  has to be screwed out, otherwise it overrides everything behind it and it constantly destrokes the main pumps, meaning slow shift of the rock and slow, constant pumping;

since you learned so much about Schwing lately, I think you should stick with Schwing...

Yeah its not lately though going on 7 years and still learning. Ed if i wanted a "PUD MIESTER" id a bought one. HA HA HA thought i'd share my new nick name. A RM driver was talking about my comp and said: Whats he run a PUD Miester?