Hi, I have recently purchased a forklift that unfortunately has a slipping transmission. It also has no brakes.

Clark C500-50
Lifting Capacity 4450 pounds
Year: it looks like 1970, not 100 percent sure

The truck only moves when you rev it high, full throttle and then it moves forward or backward. If you let loose of the accelerator, you have to start all over again. I control movement using the inching (left) pedal. So it seems like the clutch packs are worn. I can also hear a knocking/ticking noise out front of the transmission around the dipstick once its warmed up.

The oil is pink, like a strawberry milkshake, so it seems like coolant entered through the radiator. The inching valve and parking brake works, the torque convertor functions well. I haven't yet pulled the wheel to check the brake shoes, the reservoir was low on oil however.

I know I'll need to replace the transmission. I couldn't find any procedures or manuals online on how to do so. Has anyone done this before? Do you need to first remove the mast or can you get away without removing it?

I am an automotive service technician, so this is a learning experience for me, more than just the technical piece. Regret the purchase, but stuck with the lift now.

Thank you for reading!