Some early hysters have a manual transmission with a clutch these are usually a 3 speed transmission
Mscb,
The transmission for this lift will only have one, possibly two speeds, high and low. Transmission in a forklift are built for torque not speed. If you have a chance to look at the transmission, it should have a data plate attached that will supply model and serial number. Due to the age, best to remove and have it rebuilt if parts are still available. Good Luck.