body and the gear circumference will surely get scraping traces. The normal scraping
trace is not more than 1/3 long of the inner periphery of the pump body. If the scraping
trace is up to 1/2 long of the inner periphery, it indicates that the bearing and gear
shaft are subject to excessive wear. When the dimension X shown in Fig.9-12 exceeds
39.180mm or the scraping trace becomes longer than 1/2 long of the inner periphery,
replace the pump body.
(2) Bushing inspection (See Fig.9-13 & 9-14)
Fig.9-13 Fig.9-14
It is desired as an ideal condition that the inner sliding surface of the bushing is
smooth and about the half portion toward the inlet side presents lustrous contact
surface. If any one of the following conditions is found, replace the bushing.
a) The whole inner sliding surface shows contact trace and gets rough to the feel
Inlet port
Striation
Exit
Repair limit size
Exit
Fig.9-12
Exit
Gear side
Striation
Inlet
-82-
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