... hardness 3high precision 4OEM accepted 5ISO9001:2008 certificate Wholesale high performance lawn mower parts of clutch assembly Features: 1High ... , striking fork, hydraulic valve pushrod seat, oil pump rotor, oil pump gear, oil pump flange, Pistons, Foot Valves, Rod ... reciprocating, rotating and oscillating movement with start frequency and difficulty to form oil film occasions 8With lower wear rate ...