Appendix
SP 305
Startup 250:Users:Danny:Desktop:Operation manuals:line pumps:maverick
(P305):Appendix.fm
Operation Manual -
73
Again, plot the results on a clean copy of the flowchart.
As we plot this pump, we can see that the dots are
moving quite a bit to the inside of the flow specification
(See below).
When you connect the dots, the line is completely
below the specifications. 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
pressures. Note! Never try to make up for this weak
pump by increasing the speed of the engine. If the
pump turns faster than specification, 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 specification plot for a
while but the breakpoint is too high or too low, it is
possible to make an adjustment. Contact Schwing
America’s Service Department for the procedure.
There are many different possible pump kits and power
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 differential cylinders,
material cylinders, or hydraulic pumps, because you
may need a different output chart than the one that was
originally shipped with the unit.
Piston side scales have been removed for clarity
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
000318.eps
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