71
Operation
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Shutting the Machine Down
Stopping the engine immediately
after the engine has been working
under load, can result in overheat-
ing and accelerated wear of engine
components.
Avoid accelerating the engine prior to
shutting down the engine.
Avoiding hot engine shutdowns will
maximize turbocharger shaft bearing
life.
To shut the machine down, put all functions in the neu-
tral or OFF position. Reduce engine RPM to a low idle,
allow the engine to idle for 5 minutes in order to cool.
When the engine has cooled, turn the ignition keyswitch
to the OFF position.
After key-o, the DEF pump will circulate the DEF uid
for a given time, in order to cool the DEF injector. The
DEF pump will also purge the DEF system of uid to
protect the lines from freezing in cold conditions. The
SCT screen will remain ON during this process. When
nished the SCT system will shut o and the screen will
go blank.
Disconnecting the battery power too soon may pre-
vent purging of the DEF uid lines after the engine has
shutdown. Do not disconnect the battery until “Wait to
Disconnect” symbol is no longer displayed on the SCT
screen (Figure 23).
Connected
Wait to Disconnect
symbol
Disconnected
Figure 12
Wait to Disconnect symbol / Battery switch
Lubricating Slurry
Shovel a couple loads of sand or dirt into the bot-
tom of the Rock Valve housing, above the cleanout
door. This will prevent concrete from lling the door
area and setting during the course of the day. See (Fig-
ure 13).
Shovelingwpt.eps
Figure 13
Sand to Cover Hopper Cleanout Door
Lubricating the pipeline
When the ready-mix trucks arrive on the job, the pipe-
line can be lubricated. Schwing America highly recom-
mends that you pre lubricate the pipeline each time you
pump into dry pipe. In some parts of the United States
and Canada, the concrete is so rich with cement nes
that operators do not pre lubricate before beginning
pumping operations. This practice is not recommend-
ed. The time you save by skipping pre lubrication is far
less than the time you will spend removing pipe sec-
tions from a separately laid pipeline to remove a rock
jam caused by dry pipe. Most importantly, the blockag-
es caused by failure to lubricate can be dangerous (see
the information on blockages in the Safety Manual.)
There are commercially available products that will
lubricate a pipeline with much less volume (meaning
much less weight) than portland cement and water.
These products usually come in sandwich sized plastic
bags, and lubricate about 100 feet of 5 inch pipe per
bag. Instructions for mixing vary by the dierent man-
ufacturers. These products are less expensive than
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