6251-71-8210 Priming Pump Suitable for Komatsu PC400-7 PC400-8

The 6251-71-8210 priming pump is a hand-operated fuel priming/transfer pump used to remove air from the fuel line and help restore fuel supply after filter replacement or fuel system service. Komatsu lists 6251-71-8210 as a Priming Pump in its parts catalog. 

This aftermarket unit is commonly referenced for Komatsu excavators such as PC400-7 / PC400-8 and engine arrangements including SAA6D125E / SAA6D140E / SAA12V140E (verify by machine serial number and old label). 

Key Benefits

• Helps prime the fuel system after fuel filter or fuel line service

• Reduces hard-start issues caused by air entering the fuel circuit

• Direct replacement reference: 6251-71-8210

Common Symptoms of a Faulty Priming Pump

• Hard starting after filter changes

• Fuel leakage around the primer body or seal

• Primer becomes loose / cannot build pressure

• Engine stalls or runs rough due to air in fuel line

FAQ

Q1: Is this a genuine Komatsu part?
A: No. This listing is an aftermarket replacement supplied by Topvelsun. The OEM number 6251-71-8210 is used for identification reference.

Q2: What does a priming pump do on Komatsu engines?
A: It manually primes fuel to help push air out of the fuel line, especially after fuel filter replacement or fuel system maintenance.

Q3: I saw 6251-71-8212 mentioned—does it replace 6251-71-8210?
A: Some Komatsu dealer portals show 6251-71-8212 as the latest replacement for 6251-71-8210. Always verify with your machine serial number and original part label.

Q4: Which machines/engines is 6251-71-8210 commonly listed for?
A: It’s commonly listed for Komatsu excavators such as PC400/PC450 families and engines like SAA6D125E / SAA6D140E / SAA12V140E, but exact fitment depends on arrangement and serial breaks—confirm before ordering.