Hello,
I just purchased a 2000 CAT E6000I GC30K Forklift. Runs great, turns great. No smoke. However, it lacks power to drive up a small incline ramp or get over a bump. Also, i have to rev up the rpms to lift the forks, or make it over the small bump.

Any suggestions plan of attack? Should I start with the propane system clean (carb, filters, diaphragm) or not sure if it has an inch valve or disconnect valve.

Please advise.