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John Deere Tractors Discussion Forum

How tuff is it to rebuild a TOM

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Johnh Riggins

05-18-2007 18:07:07

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I have a 420W that leaks and the TOM does not stay up when I shut off the engine.I am thinking about taking it off and send it out to get refurbished.How hard is it to take off and is it commom to bring it to someone to get it overhauled?Any input would be helpful beeing a newbie.....

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buckeye al

05-21-2007 16:10:45

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Re: How tuff is it to rebuild a TOM in reply to Johnh Riggins, 05-18-2007 18:07:07

Since none have replied to your questions, I'm going to go out on a limb here and guess these units basically the same as the 40 series units though I've never worked on a 420. If my assumption is wrong, I suspect somebody will let us both know. I know the difference between a 70 and a 720 hydraulics rather extensive but I think the 40/420 were basically the same. If you already know they're significantly different, label me fullocrap for this day!

Very often the 40's will fall when off because of leaking check valves. Check valves CAN be serviced without removing the unit but you say yours is leaking. Therefore it's likely best to just remove the unit & go through it ALL once it is off of the tractor.

As for how difficult it is to remove, actually not a bad job. Has some decent weight to it but not a bad job even without a manual.

We have a 40W that had these same troubles and more. I found the 40 service manual VERY clear and complete. I suspect a similar book exists for the 420. I'd recommend not working on it's innards without the manual! Same is true of the external linkages.

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Johnh Riggins

05-22-2007 17:40:11

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Re: How tuff is it to rebuild a TOM in reply to buckeye al, 05-21-2007 16:10:45

Thanks Buckeye..... ..... ..I will attempt in the fall.

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buckeye al

05-23-2007 15:01:20

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Re: How tuff is it to rebuild a TOM in reply to Johnh Riggins, 05-22-2007 17:40:11

There are some little shim disks (they look like paper punch holes from steel shim stock) that are needed to adjust tolerances in the check valve stems for timing of the rods & check valve openings but they're pretty straightforward units.

The books will tell you to check some things BEFORE you start wrenching! Those tests can tell you some things are OK & you won't need to monkey with them or that you will because they're not. Relief pressure for one thing is sort of tough to test after it's off the tractor.

Later.

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