113
Maintenance
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Setting main relief / Pressure cut o
Pressure settings must be made with the oil at
normal operating temperatures (40°– 60°C).
Main system adjustments are preset at the facto-
ry. The following procedure begins with adjust-
ment of the main relief cartridge and pressure
cuto. If proper pressures can not be obtained
through these steps, contact the Schwing Ser-
vice Department.
It is vital that each adjustment screw be proper-
ly identied prior to making any adjustment. All
screw adjustments for the system relief must be
made with the pumpkit in the neutral position,
and adjustments for pressure cuto must be
made with the engine shut o.
S2
A1
XA
PR
AB
S1
S2
A1
XA
XR
P2
MP
T2
B1
XB
XP
P1
T1
MX
X1
T
X3
1.2
1.4
1.1
100
bar
330 bar
20 bar
1.7
mm
1.1
mm
Concrete Pump
Main Relief Valve
Soft Switch
Relief Valve
Pressure Cut-Off
GA
M
Y
V
g max
V
g min
S
M
1
T
1
T
2
R
300 bar
Figure 37
Relief cartridges and pressure cut-o screw
1. With the engine running and E-Stops cleared, in-
crease the throttle to maximum RPM. Close the
quarter turn and soft switch valve (Figure 38).
Quarter Turn
Shutoff Valve
Soft Switch
Shutoff Valve
Figure 38
Close the Soft Switch and quarter turn valve
2. At the rear operator panel, select “local” control
with the “local/remote” button. Press and hold the
stroke limiter (+) button until the stroke limiter is at
maximum output (Figure 39).
ACC2ACC1
ACC3
98413629-00
Local / Remote
Button
Stroke Limter (+)
Button
Figure 39
Rear control panel, stroke limiter and pressure gauges
3. The main system control block pressure must be
set rst to properly set the pressure cuto on the
pump.
4. Go to the pressure cuto screw on the hydrau-
lic pump, and back o the jam nut with a 13mm
wrench. Turn the adjustment screw in (clockwise)
one quarter turn with a 4mm allen wrench then
tighten the jam nut. This should raise pressure
cut-o above the main relief valve pressure set-
ting. Restart the engine and place the concrete
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