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AGMA 424.01 63rd Edition, December 1, 1963
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Practice for Helical and Herringbone Ciearing for Oilfield Mud Pumps
Includes all amendments and changes through Reaffirmation Notice , June 22, 1974
Additional Comments: CNCL NO S/S
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This Standard Practice is intended for mud pump gearing only and should not be applied to any other type of oilfield equipment.

It may be applied to mud pumps of any size and rating.

It imposes certain stipulations from Standard AGMA 420.03, "Helical and Herringbone Gear Speed Reducers and Increasers".

Ratings are based on surface durability (which is independent of pitch). The surface durability rating practice differs from Standard AGMA 211.01, "Surface Durability of Helical and Herringbone Gears", in the following respects:

a) The new Fi curve was developed by the Oilfield Gearing Committee;

b) Gear and pinion materials are limited to steel cut after heat treating and to combinations using gears of 300 Brinell or lower hardness;

c) Nodular iron gears. See paragraph 3.2.