SANY SY465H excavator-Quality improvement - boom&arm

05 May,2017

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Failure rate of boom within 10000 hours fells to 5%.
Failure rate of arm within 10000 hours fells to 4.8%.

Welding method is welding by both side;
The circumferential weld of medium support and side plate improved to X groove welding;
Medium side plate thickness increased from 22 mm to 25 mm;
Sheet strength increased from 235 MPa to 345 MPa.
Amount of side plate increased from 2 parts to 3 parts;
Thickness of side plate increased;
Sheet strength increased from 245 MPa to 345 MPa;
Add fully welding between medium plate and top plate to disperse force;
Change shaft sleeve form from step set to straight set;
Switch front support to forging, change the lubrication method to lubricate on both sides at the same time.

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