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C-30HDN PUMP — OPERATION AND PARTS MANUAL — REV. #11 (03/29/12) — PAGE 21
C-30HDN— HOW IT WORKS
The MAYCO 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 7) 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.
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 875 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 7. Pumping Cylinder