Schwing SPB 28, Operation Manual

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78
Operation
SPB Operation Manual
should tap lightly on the pipeline, as far from the pump
as possible, and listen for the ringing sound of an empty
pipe. This will tell him that the cleanout ball has passed
his location. When he sees the concrete beginning to
pick up speed, he should tell you to shut off the air and
bleed the line by opening the air discharge regulator
valve (Figure 44). If this procedure is timed correctly,
the ball will pop out the end of the pipeline with little or
no compressed air behind it.
If the air is not bled before the ball reaches the
end of the pipeline, the expulsion of compressed
air can have tremendous force and cause the
pipeline to react violently. This concussion has
been know to break safety restraints and allow
the ball or go- devil to be launched as a projectile
along with the remaining concrete, causing se-
rious injury and property damage. Use extreme
caution!
Water/air inlet
Air discharge regulator valve
Air inlet regulator valve
Ports spaced so a cleanout
ball cannot cover both
ports simultaneously
Figure 44
Approved blowout cap
Folding up the clean boom
To fold up the boom after it has been cleaned:
1. Retract section #4 into #3, and retract #3 into #2
etc., making sure not to drag the tip hose.
2. Again watching for obstructions, rotate the boom
into the storage position. There are arrows welded
to the turret and tower on the passenger side of the
unit that will line up when the boom is rotated to the
correct position.
Emergency Procedures
Loss of remote control
The remote control box is considered the primary control
source for the boom. If you lose the remote control for
any reason, you can still finish the job, but you must use
extra caution. The manual control devices are shown in
the Product Overview section of this document. Each
manual control device does what its remote-control
counterpart does, but with less convenience. Get assis-
tance, if needed. The emergency override handles of
hydraulic valves are not positioned at a work platform,
so WATCH YOUR STEP if you need to access them.
Common safety hazards
Do not try to finish a job when safety is being compro -
mised. Some examples of problems that would compro-
mise safety include:
• Crack or break in boom or other load-bearing
structural members.
• Missing, damaged, or unusable guard.
• Malfunctioning Emergency stop button
To start the unit or to reset from E-stop:
1. Put all function controls in the “off” or “neutral” po -
sition.
2. Be sure that all emergency stop switches are in
the up (not activated) position. This will reset the
E-stop relay and allow the unit to go to the “ready”
mode.
3. If stop LED is flashing red, reset by confirming that
all control functions are off, pushing any E-stop
and then releasing it.