General Information - MULTIQUIP MAYCO Series Operation Manual

The pumping piston (Figure 3) is forcing the material past
ball (B) and out to the nozzle, also seating ball A so that the
material will not flow back to the hopper. This action also
fills the compensating piston for the next stroke.
Figure 4 shows the relationship between the return spring,
the compensator spring and the rocker arm to maintain a
smooth performance. DO NOT tighten the bolt (Item 1)
completely, the rod end must be able to move.
Figure 4. Return Spring, Compensator Spring and Rocker Arm Interaction
PAGE 16 — MAYCO C30HDGA CONCRETE PUMP • OPERATION MANUAL — REV. #1 (09/09/19)
The return spring 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 (3-inches) as shown to produce proper pre-
loading of the spring for a smooth performance.
Figure 3. Pumping Pistons

GENERAL INFORMATION