35
Overview
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Emergency Stop (E-Stop) manifold
The emergency stop manifold is a safety device that
consists of two dump valves with override buttons.
Figure 3
Emergency stop manifold
The dump valves are a normally open, which means
that electricity must be present before the valve can
close and pressure can develop in the hydraulic circuits.
If there is an electrical problem or an emergency stop
switch is activated, power is lost to the solenoids, the
dump valves open and route all oil from the hydraulic
pump directly back to the hydraulic tank, causing a loss
of hydraulic pressure and disabling the hydraulic circuit.
If power is lost to the emergency stop dump valves,
press and hold the override buttons (Figure 3) to re-
store hydraulic pressure. The concrete pump can now
be placed into forward or reverse with handle located
on the S1/S2 control block. You can also restore power
by connecting the Emergency Power Cable Plug to the
emergency stop manifold, see “Electrical power loss”
on page 87.
Manual Forward/Reverse
Handle
Figure 4
Concrete pump forward/reverse handle
Hopper Grate Interlock Switch
The Hopper Grate Switch consists of a switching cam
and pressure roller switch. The switching cam is at-
tached to the hopper grate. The pressure roller switch
is wired through the concrete pump forward / reverse
solenoids and the agitator dump valve. When the hop-
per grate is lifted, the pressure roller switch will move
out of the switching cam groove and break the circuit.
The concrete pump will go into the neutral position and
the agitator will stop moving.
Shutting the hopper grate will reconnect the electrical
circuit, the concrete pump will remain in neutral until
you activate a forward or reverse function, the agitator
will continue moving.
Hopper Grate Closed Hopper Grate Open
Hopper Grate
Hopper Grate
Switch
Switching Cam
Pressure
Roller
Switch
Figure 5
Hopper grate switch
Never put any part of your body in
the hopper or in the concrete valve,
either from above (through the hop-
per) or from below (through the outlet
pipe or clean out door). Serious inju-
ry can result.
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