3075674 Excavator Hydraulic Pump Link Parts for ZX200

Part number 3075674 is the key transmission component - connecting rod - inside the axial piston hydraulic main pump of Hitachi excavator. According to industry general information, this part is mainly suitable for Hitachi medium to large excavators equipped with Kawasaki K3V series (such as K3V112, K3V140) or Hitachi HPV series variable displacement piston pumps. This may specifically cover common 20-30 ton models such as Hitachi ZX200-3/G, ZX220-3, ZX250-3, ZX270-3, EX200-5, EX300-5, etc.

This connecting rod is the core power conversion component in the hydraulic pump that converts the swing of the inclined plate into the linear motion of the plunger. Its core function is to withstand huge alternating impact loads under high pressure (usually up to 35MPa or above) and high speed conditions, accurately and efficiently transmit the rotational motion of the drive shaft or inclined plate to the plunger, and drive its reciprocating motion to complete the oil suction and pressure process. As an original precision component, it is usually forged from high-strength alloy steel (such as 40Cr or 42CrMo) and undergoes precision machining, quenching and tempering heat treatment, and surface hardening treatment, possessing extremely high tensile strength, fatigue strength, and wear resistance.

The maintenance core of this connecting rod lies in preventing abnormal wear, monitoring fit clearance, and ensuring lubrication to extend the overall life of the hydraulic pump. Regular inspection and maintenance: It is recommended that the hydraulic pump be disassembled and inspected by professional personnel in a dust-free environment, in conjunction with a major overhaul of the equipment every 4000 working hours. Focus on checking whether the connecting rod body is bent or cracked, and measure the clearance between the ball joints or pin holes at both ends and the matching bearings. According to maintenance experience, the clearance between connecting rod bearings should usually be controlled within 0.08mm. If it exceeds 0.12mm, it is considered to be excessive and needs to be adjusted or replaced immediately.