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1973 auto 18 hydrostatic tranny lacks power
wheelhorse-c-161-1979 posted a topic in Transmissions and transaxles
I've had my 1973 auto 18 for about a month now. Every week I've been improving things on it to make it more functional. New hydraulic lines on the auto loader, changing the spindles, etc.. Every day I have it I wonder how I ever lived with out it!!!! The one thing I'm starting to get concerned about is the tranny. The tractor moves forward and backwards but lacks power. Also when in it starts in motion the tranny makes that whirring sound that reminds me of a car with a power steering pump low on power steering fluid when you would turn the steering wheel. The whirring sound is always present in reverse and when moving forward at slow speed. The tranny fluid F seems clean and up to where it should be on the dipstick. But the tractor has a tough time going up a hill in reverse, or pushing the front end loader forward to scoop up a load of dirt or what ever. In forward it seems to go relatively fast when the tranny is first engaged. I downloaded the Sunstrand Hydro manual at http://www.wheelhorseforum.com/files/download/24-sundstrand-hydro-transmission-repair-manual-492-4206pdf/ I found the transmission oil filter which looks like it hasn't been changed in a while. But I'm afraid to remove it if I can't find a replacement. Also I'd change the tranny oil but can't figure out exactly from the manual where the transmission drain plug is. I think it might be on the transaxle but the manual doesn't point out where. If anyone has experience with this tranny I'd love some suggestions. Any ideas? Is this an adjustment or am I headed for a tranny rebuild? Thanks for your thoughts and help Jack