Schwing SP 500 - Page 133

133
Appendix
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Again, plot the results on a clean copy of the owchart.
As we plot this pump, we can see that the dots are mov-
ing quite a bit to the inside of the ow specication (see
below).
When you connect the dots, the line is completely be-
low the specications. This pump is very weak and will
completely stop pumping oil soon. You may notice high
heat with this unit if you are pumping at high oil pres-
sures.
Never try to make up for this weak pump by in-
creasing the speed of the engine. If the pump
turns faster than specication, it will not be able
to draw oil as fast as it is turning (“cavitation”),
and immediate failure could result.
If the plotted curve matches the specication plot for a
while but the breakpoint is too high or too low, it is possi-
ble to make an adjustment. Contact Schwing America’s
Service Center for the procedure.
There are many di󰀨erent possible pump kits and pow-
er settings for this unit. If you accidentally destroy your
original output chart, please have your serial number
handy when you call to get a replacement. Also, please
advise us if you have changed di󰀨erential cylinders,
material cylinders, or hydraulic pumps, because you
may need a di󰀨erent output chart than the one that was
originally shipped with the unit.
13
CONCRETE OUTPUT (cu yd / h)
NUMBER OF STROKES
(stroke / min.)
OIL VOLUME
(liter / min.)
26 39 52 65 78 92 105 118 131 1440 157 170 183
ROD SIDE
ROD
SIDE
350
100 200 300 40050 150 250
51015202530
ROD SIDE
(bar)
CONCRETE
PRESSURE
(BAR)
7
14
21
28
34
41
48
55
62
70
76
83
CONCRETE
PRESSURE
(PSI)
100
200
300
400
500
600
700
800
900
1000
1100
1200
52758
50
100
150
200
250
300
350
OIL PRESSURE (BAR)
196
170.5
26
Breakpoint
breakpoint
178 bar
250 bar
300 bar
0 bar
100 bar
200 bar
(138) (204) (274) (332) (366)(390)
WEAK
3checking output.eps
Note: Piston side scales have been removed for clarity.