Parts replacement principle
If main pump needs to be repaired to reach the original performance index, parts replacement principle must
be followed to replace parts, following is the detailed replacing rules:
1 Side plate: replace side plate when it is scratched, there is pit, spray and finishing layer sheds, burnt,
deformed and cavitation corrosion.
2 Gear: replace gear when one of the following conditions happens: shaft diameter of gear shaft is
scratched or worn in sealing zone; teeth surface of gear is worn, scratched, broken or deformed; addendum
circle is damaged seriously; multiple spline or flat key and spindle nose are worn, deformed and broken.
3 Castings (front cover, pump body, and rear cover):
3.1 If there is flaw on castings, and sealing zone has chip, rust, deformed pin hole, then replace castings.
3.2 Replace pump body when one of the following conditions happens: oil mouth is broken, pump body is
broken and rusty; when bore depth of pump body 0.08mm.
4 Round pin: round pin must be replaced when the matching does not comply with requirements, pin is
broke and deformed, replace the front cover, pump body and rear cover matched with round pin when it is
necessary.
5 Rolling bearing: new parts must be replaced when quill roller drops, retainer is damages, quill roller has
surface pitting, roller path has surface pitting, oversintering.
6Secondary sealing ring: replace with new parts when there is inner diameter abrasion, end face abrasion,
thickness is milled, deformed, surface is coarse.
7 Non-metal sealing parts: all non-metal sealing parts must be replaced.
8 Outboard bearing: replace with new parts when parts are worn and rusty.
9 Fastener: replace it when it is drawn out, deformed and damaged.
Main Pump SPC000012
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