Download the official Ford 6610 hydraulic parts diagram, print it in 11x17 format, and hang it in your workshop. Then, check your hydraulic fluid level (right side of the transmission) and inspect the suction screen. Preventive maintenance, guided by the correct diagram, is the secret to keeping this 40-year-old workhorse running for another 40 years.

Clean the cylinder bore. The diagram calls for a "honing stone" because the bore must be smooth, not shiny.