Run-in treatment provides a protective coating on turbopump gear surfaces so that they are capable of operation under marginal conditions in mineral oil and diester lubricants. This treatment protects highly loaded gears during relatively short-term operation

Hartman, M. A.

English

NASA Technical Reports Server

February 1966	 Brief 66-10069 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U. S. space 
program and to encourage their commercial application : Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Run-In With Chemical Additive Protects Gear Surface 
.
The problem: 
Scoring of highly loaded gears of the Mk 3 turbo-
pump is a problem which lubricants such as MIL-L-
25336, MIL-L-7808, and kerosenes in RP-1 rocket 
fuel and Ri-I ramjet fuel have been unable to prevent. 
The solution: 
Employ a run-in procedure on the turbopump gears 
prior to their actual use in an engine. 
How it's done: 
The gear assembly is cleaned, vapor-honed, and 
subjected to controlled running-in on a back-to-back 
gear stand. During the run-in, the gears are step-
loaded up to a point exceeding full operational load-
ing while being subjected to a highly reactive, extreme 
pressure additive. The run-in treatment apparently 
applies a protective coating on the gear surfaces so 
that they are capable of operation under marginal
conditions in mineral oil (including kerosene) and 
diester lubricants. 
Notes: 
1. This procedure can be used to protect highly 
loaded gears during relatively short-term opera-
tion. 
2. Inquiries concerning this innovation may be di-
rected to: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama, 35812 
Reference: B66-10069 
Patent status: 
No patent action is contemplated by NASA. 
Source: M. A. Hartman 
of North American Aviation, Inc., 
under contract to 
Marshall Space Flight Center 
-	 (M-FS-548) 
Category 05 
This document was prepared under the sponsorship of the National 	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States 	 will be free from privately owned rights.
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Run-in with chemical additive protects gear surface

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