PROALL P Series, Service Manual, Page: 17 / 118

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5.3 HYDRAULIC CIRCUITS
5.3.1 DIAGNOSTICS
The Diagnostics page provides a quick few of all the hydraulic system operating conditions.

The belt pressure and auger pressure are used for
troubleshooting and pump/valve setup.

The charge pressure is used to verify proper operation of
charge relief in the return filter housing and overall charge
circuit function.

The oil temperature is a good indicator of overall system
operation as well as oil cooler function.

The filter indicators allow maintenance personnel to
pinpoint which individual filters are in bypass or have

potential indicator issues.
5.3.2 BELT
IMPORTANT!
The belt hydraulic circuit is powered by the second (middle) load sensing piston pump that is referred to as
the belt pump. The belt circuit also operates the water pump, cement and any other auxiliary functions such as
fly ash and color. The belt function is the first function in the circuit with cement and auxiliary functions running
in series after the belt. The water pump is the only parallel function that runs with the belt and is independent
of the belt operation.

When testing individual functions on the belt circuit it is
best to run them independently using the “UNLOAD”
functions in the Mixer Control screen or on the keypad.

By watching the belt pressure, the technician can see what
loads are on the belt circuit.

If the pump sounds like it’s loading up more than normal or
if a function or functions have stopped working, then start
running functions individually to narrow down where the
issue is coming from.

Run the water pump then the belt individually first and
check if the pressure changes.

If the pressure increases when the water pump or belt are
run individually then run the series functions individually
B A
D
C
E
A
B
C
D
E
A
A
B