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MAYCO C-30HDNI (PRECISION) PUMP — OPERATION AND PARTS MANUAL — REV. #7 (04/03/12) — PAGE 43
C-30HDNI (PRECISION) PUMP — MAINTENANCE (PUMP)
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 26 below.
The detent holes will prevent the
bushing from sliding away from the
bearing spacer when the pump is
under load.
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.
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.
Figure 26. Detent Holes
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.
NOTE
Position the ‘O’ ring on the O.D. of the
bearing spacer during assembly to
assure proper bearing adjustment.
NOTE