Multiquip C30HDN - Manual (Page 22)

PAGE 22 — C-30HDN PUMP — OPERATION AND PARTS MANUAL — REV. #11 (03/29/12)
Figure 9 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.
The pumping piston (Figure 8) 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 8. Pumping Pistons
Figure 9. Return Spring, Compensator Spring and
Rocker Arm Interaction
C-30HDN PUMP — HOW IT WORKS
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.