Schwing SP 750-18 - Safety Devices

34
Overview
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Safety Devices
The following paragraphs describe the safety devic-
es found on the stationary pump. The devices listed
here must be maintained in good working condition to
avoid injury. Bypassing a safety device for servicing or
emergency clean out should only be done by qualied
personal. All bypassed devices must be set back to
their original position upon completion of the service or
emergency procedure.
Emergency Stop Buttons (E-Stop)
There are three emergency stop buttons located on the
concrete pump and one on the cable remote. Emergen-
cy stop buttons are located near the following:
• Driver side hopper
• Passenger side hopper
• Waterbox
• Cable/Radio Remote
Pushing the Emergency Stop Button (E-Stop) disables
the hydraulic circuit.
To reset the E-stop and enable the hydraulic circuit, turn
the E-Stop button clockwise and press the horn button
on the operator panel or cable/radio remote.
Press to engage
Turn clockwise to release
Figure 1
Emergency stop button
Dump Valve
The dump valve (Figure 2) is a safety device that con-
sists of a 2-way solenoid valve with override button.
Override Button
Solenoid Energized, 2-Way V
alve Closed
(Hydraulic circuit pressurized)
2-Way Valve - Normally Open
(Oil routed back to tank - no pressure)
Figure 2
Dump Valve with Override Button
The 2-way solenoid valve is in the normally open po-
sition. When electrical current is applied to the dump
valve solenoid, the 2-way valve will over take the spring
and put the valve in a the closed position. This will block
the hydraulic oil from escaping to tank, allowing pres-
sure to build in the circuit.
If an E-stop button is pressed, the electrical current
to the solenoid is lost, the spring will return the 2-way
valve to the normally open position. Hydraulic oil will be
routed back to tank and pressure in that circuit will be
lost.
To bypass the dump valve, press and hold the override
button.