Mud Pump Pony Rod

Pony rod also called the intermediate rod, is an important part of the connection between the crosshead and the piston rod. It is the key component that connects the power end and the hydraulic end of the mud pump. One end is connected to the crosshead and the other end is connected to the piston rod by a clamp. Its outer circumference is filled with a packing box assembly. In the reciprocating motion, the outer circle of the intermediate tie rod and the sealing member in the packing box rub against each other. To ensure it’s wear resistance, the outer surface of the intermediate rod is hard chrome-plated.

We can offer a wide range of extension (pony) rods for triplex mud pumps that are made of high quality alloy steel (40Cr).   After strict heat treatment of quenching and high temperature, the rods have the features of high intensity on surface and high tough inside. The surface is treated with galvanization or nitrogen for high intensity and low abrasion.

1.The intermediate/extension rod (Pony Rods) is the critical part for the power end outlet of the mud pump.

2.The larger end connects the crosshead and the smaller one connects the piston rod through the clamp.

3. Its excircle is sealed by the two-lip seal and o ring in the stuffing box.

4.The blank of intermediate/extension rod is 45 steel forging.

5.The excircle went through hard chromium plating treatment.

6.The roughness is Ra0.4.

7.All manufacturing processes confirm to the standard SY5138-92 and GB/TI9001-2000-ISO9001-2000 Quality Management System Certification.