PROALL P Series, Service Manual, Page: 26 / 118

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turning, then the cement auger itself is free. If the pressure
is low and the cement auger is still not turning check that
the drive chain isn’t broken. If the pressure is at the
compensator setting of about 3600psi then something may
be jamming the cement auger.

If the cement auger does not turn in cement unload and the
belt pressure is at max compensator pressure of about
3600psi then there may be packed cement powder around
the cement auger. Also, check the drop tube sock on the
cement auger outlet to make sure it isn’t plugged. Activate
the cement aerator circuit to loosen up the powder over
the cement metering auger. Turn the cement unload
function on and off several times to get the cement auger to
turn.

If the cement auger still does not turn and the pressure is at
compensator pressure of about 3600psi then the hydraulic
valve may be stuck/sticking. To determine if the cement
valve itself is the issue run the belt in belt unload mode and
see if belt will turn or is at the same high pressure. This is
an indication that the cement valve is stuck blocking the
flow of oil from the belt motor as well.

Replace the cement valve if required.
5.4.5 AUXILLARY 1 (POZZOLAN)

AUX1 is essentially a second cement (pozzolan) metering
system and the diagnostics steps are the same as the
primary cement metering system.

Typically, AUX1 systems run much slower than the cement
metering system, so be careful of low (<10RPM) setpoints.

The Commander control system will warn the mix design
creator / operator when the speed ratio goes below 15%
by changing the text to red.
A
B
A
A
B