ZD21 hydro rebuild

Firefight100

Member

Equipment
MX5200
Apr 3, 2021
92
73
18
63379 troy mo
So I had a hydro just quit pulling recently. I was able to remove the final drive and hydro right side, without having to remove the fenders, roll bar, fuel tank exc. Took about 1 hour to remove it all thru the wheel well.
After disassembly I was greeted by the parts explosion below. It looks like the snap ring under the spring may have come loose and chewed up some parts. Luckily my pump, motor, and housing were not damaged. I had thought the only option was a total new hydro. But Messick's had all the parts in stock to repair and I only dropped $153. total to get back up and running. About two hours to rebuild the hydro and an hour to reassemble the mower.
Hytdro parts.jpg
 
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ruger1980

Active member

Equipment
L4310 w/La682, L225
Oct 25, 2020
461
171
43
CNY
Wow that is some serious contamination that was sent through the system. I would really like to see what the rotating group and valve plate looked like.