Usage:
12G, 14G, 16G, 120G, 130G and 140G Motor Graders
- SUPPLEMENT: 05/19/80
SERVICE MAGAZINE, JANUARY 7, 1980, PAGE 4. In the article, "Clearance Increased Between Sleeve Bearing And Transmission Center Shaft", the metric dimensions shown for the diameter of the end of the shafts is wrong. Change the first sentence of the third paragraph to read, "The shafts, which now have a 1.6175 ± .0004" (41.084 ± 0.010 mm) diameter at their ends, are .002" (0.051 mm) smaller than they were formerly." Change the second sentence of the sixth paragraph to read, "Modifications can be made by either grinding the shaft ends to the 1.6175 ± .0004" (41.084 ± 0.010 mm) diameter or by installation of a new center shaft assembly which has the smaller diameter ends."
Also, in the second sentence of the fifth paragraph, change "center shaft" to read "pinion shaft".
Change the paragraph between the two parts charts at the upper right corner of the page to read, "The counterbores can be added to the back side of the bearing cage during reconditioning, or a new bearing cage assembly which has the counterbores can be installed as shown in the chart."
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Description of Change: The bearing clearances have been increased at both ends of the 9P8456 Shaft Assembly and the transfer gear end of the 3P1602 Shaft Assembly in the planetary groups for the above motor graders.
Also, a counterbore has been added to the drain holes on the bearing cage on the above models, except the 14G and 16G.
The shafts, which now have a 1.6175 ± .0004" (42.545 ± .011 mm) diameter at their ends, are .0020" (.051 mm) smaller than they were formerly. This results in an increase in clearance range from the former .0013" (.033 mm) to .0057" (.145 mm) to the new .0033" (.084 mm) to .0077" (.196 mm).
Formerly, the smaller clearance range between the sleeve bearings and the center shaft some times caused overheating and seizure of the bearings.
The .625" (15.88 mm) counterbores, with a depth of .08" (2.0 mm) on the drain holes in the bearing cage, prevent the holes from being closed by the shaft. Formerly, it was possible for the end of the center shaft to move against the drain holes in the cage and close them.
Adaptable To: The clearance is adaptable to the earlier models of the above machines. Modifications can be made by either grinding the shaft ends to the 1.6175 ± .0004" (42.545 ± .011 mm) diameter or by installation of a new center shaft assembly which has the smaller diameter ends. The part numbers are shown in the chart.
The counterbores can be added to the bearing cage during reconditioning or a new bearing cage assembly which has the counterbores can be installed as shown in the chart.
