MULTIQUIP MAYCO Series Operation Manual page 15

HOW IT WORKS
The C30HDGA concrete pump has one main pumping
piston which is valved by means of two ball checks. (A
inlet, and B outlet.)
The secondary piston is used as a compensator piston to
smooth out the pulsations of a single piston action. Note:
The compensator will not start operating until material is
pumped into the line and back pressure develops.
The compensator spring, which is installed on the
compensator piston rod, deflects with each piston stroke.
This "spring cushion", in conjunction with the cam profile,
produces and uninterrupted smooth flow of material under
average pumping conditions.
The pumping cylinder (Figure 2) retracts drawing the
material past the ball (A) and filling the cylinder. The
compensator piston is pumping the material out to the
nozzle and causing ball (B) to seat preventing the material
from returning to the pumping cylinder intake.
MAYCO C30HDGA CONCRETE PUMP • OPERATION MANUAL — REV. #1 (09/09/19) — PAGE 15
An automatic, centrifugal clutch is installed to engage and
disengage the pumping action without stopping or starting
the engine. The centrifugal clutch is set at 1100 R.P.M. The
engine idle speed is approximately 900 R.P.M.; therefore,
the clutch is completely disengaged at idle. The throttle
settings while pumping should always maintain an engine
R.P.M. high enough to prevent the clutch from slipping and
burning the clutch lining.
The return spring which is installed on the rocker arm, is
installed to eliminate shock and stress between the cam
roller and the cam weldment when the pump is in operation.
If the return spring is removed or replaced for any reason,
maintain the backing plate dimension of 3" as shown on
Figure 3, to produce the proper pre-loading of the spring
for a smooth performance.
Figure 2. Pumping Cylinder
GENERAL INFORMATION