2
3. Install Jam Nut 7/8-14 and Spring Retainer Nut onto Threaded Stem.
4. Install the Threaded Stem and nut assembly, then the Spring and next the Arbor Stem onto Spring
Rod.
5. Replace bushing (P/N12-400803-000) and reassemble rubber bumper, washer and jam nuts.
Adjustments
1. Place a standard size ball between the ball lift rods and ball elevator wheel and manually rotate
the ball elevator wheel until the ball wedges itself, thus lifting the ball lift rods. Loosen the jam
nut and turn the adjusting screw on the clapper block until the bottom of the screw is 1/2 inch (±
1/16) from the surface of the lower clapper block stem. Refer to
Figure 2.
Figure 2
2. Place a standard size ball between the lift rods and bail elevator wheel near the top of the lift
rods. Loosen jam nut (P/N 11-125208-001) and turn the adjusting nut on the spring rod until a
3/8” (+1/16-0) gap is obtained between the rubber bumper and the ball trip bracket. Tighten the
jam nut against the adjusting nut. Refer to
Figure 1.
3. To increase or decrease riser rod tension on the ball, simply turn the Spring Retainer Nut to ob
-
tain the proper pressure (ideally this is the minimum pressure required to elevate an oily ball).
IMPORTANT: Do not allow the spring to reach less than 7/16”
open; the spring will not function at solid height.
4. Place a standard size ball at the lower center of the ball wheel so that it is resting against the rear
ball lift rod. With the pit shaker in its rear most position, there should be 1/16” minimum clear
-
ance between the lower portion of the ball and the rear edge of the pit shaker clamping plate.
LOWER CLAPPER BLOCK STEM
(GAP 1/16)
+
-
