Schwing SPB 28, Operation Manual

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32
Overview
SPB Operation Manual
Safety Devices
The following paragraphs describe the safety devices
found on the separate placing boom. The devices list-
ed here must be maintained in good working condition
to avoid injury. Bypassing a safety device for servicing,
emergency fold-up, or clean out should only be done
by qualified personal. All bypassed devices must be set
back to their original position upon completion of the
service or emergency procedure.
Emergency Stop Switches (E-Stop Button)
There are two emergency stop switches located on the
separate placing boom and one on the remote control
box. Emergency stop switches are located near the fol-
lowing:
• Radio Remote
• Boom Handvalve on Power Pack
Pushing the Emergency Stop Switch (E-Stop button)
stops the electric motor and disables the hydraulic cir-
cuit.
To reset the system and enable the hydraulic circuit, turn
the E-Stop button counter-clockwise on the Radio Re-
mote.
E-Stop
Figure 1
The Emergency Stop Switch
Pressure Relief Valves
Pressure relief valves are the safeguards which lim-
it maximum pressure in a system by diverting excess
oil to the hydraulic tank when maximum pressures are
exceeded. The relief pressures listed on the hydraulic
schematics are not nominal figures. They are the hy -
draulic relief pressures that the separate placing boom
was designed to work with and that the components
were designed to accommodate.
Under no circumstances should you raise hy-
draulic relief pressures arbitrarily or because
you “think it might help.” Conversely, lowering
the hydraulic relief pressure settings may cause
poor performance, heat, and related premature
component failure. In some extreme cases, rais-
ing or lowering hydraulic relief pressures may
cause dangerous operation. Check with the
Schwing America Call Center before changing
any hydraulic relief pressure settings.
Boom Handvalve
Relief Valve
Figure 2
Example of a Pressure Relief Valve