Schwing SP 750-18 - Controlling the Concrete Pump; Stroke Limiter; Cable Remote

74
Operation
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Controlling the Concrete Pump
Stroke Limiter
Stroke
Limiter
(+)
Stroke
Limiter
(-)
The stroke limiter is a hydraulic
device that can be electrically ad-
justed with the stroke limiter (+)
and (-) buttons, located at the rear
operators station or cable remote.
Its function is to raise and lower
the output of the hydraulic pumps
that operate the concrete pumpkit. This has the advan-
tage of allowing the engine to remain at higher RPM,
where horsepower is at the maximum.
The stroke limiter has an adjustment range of 95 per-
cent. That means it can go from as low as 2 strokes
per minute to maximum strokes per minute. The stroke
limiter only adjusts the output of the hydraulic pumps
while the di󰀨erential cylinders are moving. That means
that when the di󰀨erential cylinders are stopped at the
end of the stroke and the Rock Valve is moving, the
pumps don’t return to maximum output until the Rock
Valve cylinder has completed its travel.
Pressure reducing
valve (not manual
stroke limiter)
Cap nut
Lock nut
Allen head for
manual stroke limiter
Solenoid
Figure 17
Stroke limiter control block
If electrical control of the stroke limiter is lost, it
can be adjusted manually by removing the cap
nut located on the top of the solenoid assembly
and loosening the lock nut with a 1/2 inch wrench.
The adjustment is then accomplished with a
5/32 inch allen wrench by turning the screw in
(clockwise) to decrease strokes or out (counter
clockwise) to increase strokes. Always return the
manual stroke limiter to maximum strokes (full
counter clockwise out position) when electrical
power is restored.
Cable Remote
To use the cable remote, remove the dummy plug from
the rear socket and replace it with the cable remote
plug. At the operator control panel, put the Local/Re-
mote button in the remote position. Clear the E-stop by
releasing the E-stop button on the Cable remote and
pressing the horn button.
E-stop Button
Horn Button
Dummy Plug
Dummy Plug
(removed)
Cable Remote
Plug
ACC2ACC1
Figure 18
Connecting the radio remote