Original Model: Onan B48M-GA018/3438a
That series of engine is no longer made and the OHV engines are a little larger physically. I need to see some pictures of your engine on the unit to determine if the OHV engine will fit on it or not Do you drive off of the shaft side? If so, what are the dimensions of the shaft?

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General Disclaimer

While we may have sold many engines listed above to be used for a Hydra Mac 6C Category Category, we are NOT claiming these are exact replacements unless the product notes explicitly say so. Many original equipment engines may no longer be in production because of obsolescence or EPA regulations, so in some cases there may not be an exact replacement available. Our intention here is to show that other customers have utilized these in the equipment shown, but may have had to make some modifications to do so. If we know of any required changes, we will list those, however, some adapting during installation should be expected.

Hydra Mac 6c Service Manual Download
Hydra Mac 6c

Hydra Mac 6c Service Manual Download

Hydra Mac 6c

Feel free to give our friendly staff a call about available parts or manuals for your Hydra-Mac if you are not finding it here - 1-800-443-0625. Choose your Sub-Category or use the 'Search products within this category' search bar just above and to the right. This manual can also be used to service Hydra Mac models: IH Model #'s cross to Hydra Mac Model #'s IH 4120 - 5C Kohler K341 IH 4125 - 6C Onan 2cyl. IH 4130 - 8C Onan 22.5 hp IH 4135 - 8C series 3 Onan 25 hp IH 4136 - 9C series 3 Isuzu 2 cyl. Diesel IH 4140 - 12C series 2 with Chrysler 4 cyl. Gas IH 4140 - 12C Series 3 with Isuzu 3 cyl. This is my Hydra Mac 5c I have been mechanically restoring over the past three months. Have been very impressed with its capabilities. If anyone has info on. Midwest location: 6A Terminal Road Peru, IL 61354 Phone: 815-580-3247 Machinery Parts Warehouse is your new source for New, Used, Rebuilt & Aftermarket Caterpillar Heavy Equipment Construction Parts. Hydra Mac 6C Skid Steer, 1007 Hrs Showing, Onan 18HP Engine Air/Oil Cooled Engine, 35' Wide X 14' High X 19' Deep Buck, Single Cylinder Raise/Lower, Single Cylinder Bucket Tilt, Partially Open Cab, Firestone 5.70-12 Tires, Stored Indoors, SN: 12720.