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:
1Side plate: replace side plate when it is scratched, there is pit, spray and finishing layer sheds, burnt,
deformed and cavitati on corrosion.
2Gear: 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.
3Castings (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.
4Round 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 and sliding bearing
5.1 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.
5.2 Sliding bearing: if one of the following conditions happens, bearing must be replaced: bearing
surface is scratched, painting coat sheds, or copper basement is exposed.
6Secondary sealing ring: replace with new parts when there is inner diameter abrasion, end face abrasion,
thickness is milled, deformed, surface is coarse.
7Non-metal sealing parts: all non-metal sealing parts must be replaced.
8Outboard bearing: replace with new parts when parts are worn and rusty.
9Fastener: replace it when it is drawn out, deformed and damaged.
Preparation before disassembling
1Clean the surface of pump, and check if the surface has chip and rust.
2Check model and factory releasing number on nameplate, if there is no nameplate on pump, check
factory releasing number at seam allowance of front cover.
3Fill in relative information on main pump returned for maintenance card before disassembling, such as
manufacturer, applicable machine model, applicable working condition, pump model, factory releasing
number, factory releasing date, head and marks of fabricator, working parameters (pressure, rotation, impact
and the constant running time at the highest pressure) on main machine, total working time of main pump
and reason for returning for maintenance, etc.
4Make sure the production is released from the factory as a whole and it is not disassembled after
releasing, otherwise it is not maintained.
5. If there is external leaking, do gas tightness checking to the entire pump and find out leaking position.
6Check tightening torque of bolts (screw down bolts again with torque wrench, record the Max. tightening
torque), learn if tightening torque of all bolts have reached the required specification.
SPC000013 Steer Pump
Page 6
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