MAYCO C30HDGA CONCRETE PUMP • OPERATION MANUAL — REV. #1 (09/09/19) — PAGE 35
MAINTENANCE
DETENT HOLE (3) INSTALLATION
1. After the bearing assembly has been is installed ,
remove the three “dog type” allen head set screws
(B) to allow detents to be drilled. See Figure 25 below
2. Use a 9/32” drill to “detent” half (minimum 1/8” deep).
Then “chase” the threads with a 3/8-16 bottom tap and
blow out the chips after drilling, to be certain that the
“dog type” allen set screws bottom in the detents to
prevent the taper bushing from sliding laterally.
NOTICE
The detent holes will prevent the bushing from sliding
away from the bearing spacer when the pump is under
load.
3. If this procedure is not followed closely the heavy
loading of the bearing during pumping operation
causes the Timken™ cone bearings to create lateral
forces which will move the taper bushing and allow the
Timken™ cone bearings to separate from the race and
subsequently fail.
4. Drill (detent) the shaft under the allen set screws “B”
to prevent the bushing from the sliding away from the
bearing spacer when the pump is under a load.
NOTICE
Position the ‘O’ ring on the O.D. of the bearing spacer
during assembly to assure proper bearing adjustment.
Figure 24. Detent Holes
