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Hello we have a caterpillar model 2c6500 we are wondering what do we have to do to lower the speed on this forklift?

This model Caterpillar forklift has a 4.3 vortec GM v6, you can adjust speed technically two different ways, the first and most easiest way but pricer option is to contact you local caterpillar parts dealer and tell them you need an ECU with the speed set to how ever MPH or KPH and they can send you one preset. All you would have to do is install the new ECU and out you go.

The other way is to call out a certified technician with the LP fuel systems software using a laptop, which is not available to the public and requires a 17 digit password to enter, but if you do have this program:

Open LP fuel systems
Open Speed display
Choose which model your forklift is
Adjust speed but since they use KPH you would have to do the math if you want it under MPH

Usually it is set to 9 kph which equals to about 6 mph