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I have a Bushhog FTH 600 finishing mower that I use behind my small tractor. The gear box locked up and it blew all the oil out. Do I need to purchase a new gear box and if so, where can I get one for a reasonable price or do I just rebuild it? Then how to I go about repairing it?

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Hi and welcome to FixYa, I am Kelly

Most likely the seal item 9 of this link has failed:
http://www.messicks.com/bhpart_model.aspx?partsid=10333&img=12201325.jpg

However.... There can be damage to the bearings (Item 7) that caused the gearbox to lock up. The pinion (Item 19) will also have to be inspected for damage as will item 17 the crown gear along with the bearings items 4 and 12.

To disassemble you will need to first remove the gearbox from the unit... then remove the top cover item 13, remove the nut item 21 the tooth washer item 21 the seal item 9 and the inner nut item 8.
Additionally you will need to remove the snap rings items 2, 16 and 20 to get it apart. This is not hard.. it just takes time and patience. I do NOT know where you can get a used gearbox at a fair price.

Your operators manual is here:
http://www.bushhog.com/images/stories/documents/manuals/FM-EFM.pdf

You can use the Bush Hog site by selecting model EFM600 here:
http://www.4emweb.com/search.asp Note that there are 2 different gearbox assemblies.

Bush Hog Parts page: (((No prices listed. See the first link for approximate prices before clicking a quantity)))
http://www.4emweb.com/sis.asp?code=BUH&pathid=18264&z=722394678&modelnum=EFM600&doctype=3&page=12209041.htm

If your a fair mechanic rebuilding this is not a difficult task... The bad thing is.... the expense of parts can run up the repair cost pretty quick. I do know that the going rate for a complete USED EFM600 is around $1,500.00 and you do not know if you will experience the same problem that you currently have. Most are sold "as is." Unless you find one that was hardly used.... it is a risk.

Thanks for choosing FixYa,
Kelly

Posted on May 25, 2011

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