JD-400-D Loader/Backhoe fan belt

NHEngineer · Sep 11, 2022

I want to replace the fan/alternator belt on my 1970 JD-400 backhoe/loader but I just don't see how to get it off. It seems that the pump is close coupled to the engine crank balancer.

Is there a trick to removal without removing the pump? Neither the owner's manual or the shop manual make any mention of the procedure so I must be missing something.

Steve@Advance · Sep 11, 2022

Pump has to come off, or whatever is
easiest.

Unless you want to use a linked belt.

Tx Jim · Sep 11, 2022

(quoted from post at 11:44:29 09/11/22) Pump has to come off, or whatever is
easiest.

Unless you want to use a linked belt.

CORRECTION: hyd pump drive coupler needs to be removed to R&R fan belt on a JD 400 TLB. Drive coupler can be removed by removing nuts(item 8) & bolts(item 7). Now would be a good time to replace bushings(item 4) part # AR49427 consists of 4 bushings. Fan belt part # is R97758

This post was edited by Tx Jim on 09/11/2022 at 08:54 am.

used red MN · Sep 11, 2022

Jim has you covered, but just wondering if you are
using an IT ..brand.. manual or a John Deere published
manual. The IT manuals do not go into a lot of detail on
minor repairs like changing a fan belt. They are
designed more for an experienced mechanic who
needs only information on complex parts of the
machine along with specs and clearances. Now a JD
book should cover the belt R&R process thoroughly.
Are you sure you did not skip over a reference to
another section? It could be that the technical writer
just missed some details. In the future you may think
about referring to another section that may require the
same process to see what is said there. Such as
pulling the front crankshaft pulley, I would suspect in
that section removal of the hydraulic pump coupler is
covered. Just some thoughts that hopefully will help
you in the future.

RobCons · Sep 11, 2022

On mine the coupler gets removed. I think its a 9/16 socket on a long extension. You may have to rotate the engine to make it easier. The bolts are reversed so one comes off from the top. The other you can access from the bottom. Its a good time to inspect the coupler for wear since your there.

caterpillar guy · Sep 11, 2022

Like said just remove the pump coupler. ?have to do that on most Deere tractors to get the belt off and on. and god time to change the rubber bushings while apart too.

Jim.ME · Sep 11, 2022

On at least some of the couplers the nuts (# eight) are used as jam nuts. The capscrews (# 7) are threaded into the coupling half clamps (# 6). Remove the nuts before trying to turn the capscrews. You may want to loosen the capscrews on the pump end of the drive shaft (# 2) and slip it towards the pump to gain a bit more room. Be careful not to lose the key out of the pump shaft, if you do loosen that end.

This post was edited by Jim.ME on 09/11/2022 at 04:41 pm.

Blackhole49 · Sep 12, 2022

If you are going to have the tractor for a while and take it apart for the belt, zip tie a second belt in there for the next
time.

NHEngineer · Sep 12, 2022

(quoted from post at 11:51:19 09/11/22)

(quoted from post at 11:44:29 09/11/22) Pump has to come off, or whatever is
easiest.

Unless you want to use a linked belt.

Click to expand...

CORRECTION: hyd pump drive coupler needs to be removed to R&R fan belt on a JD 400 TLB. Drive coupler can be removed by removing nuts(item 8) & bolts(item 7). Now would be a good time to replace bushings(item 4) part # AR49427 consists of 4 bushings. Fan belt part # is R97758

This post was edited by Tx Jim on 09/11/2022 at 08:54 am.

Thanks Tim. That is encouraging news. My tool box isn't packed full of peanut and jelly sandwiches as some have claimed (I do have some tools in it too

) but I didn't buy this girl to become a full time tractor mechanic. Is the bushing set only available from JD or is the coupling not a proprietary item and commercially available? I assume the belt is just a regular old v-belt.

NHEngineer · Sep 12, 2022

(quoted from post at 07:24:34 09/12/22) If you are going to have the tractor for a while and take it apart for the belt, zip tie a second belt in there for the next
time.

Good advise. Thanks.

NHEngineer · Sep 12, 2022

(quoted from post at 13:38:28 09/11/22) Jim has you covered, but just wondering if you are
using an IT ..brand.. manual or a John Deere published
manual. The IT manuals do not go into a lot of detail on
minor repairs like changing a fan belt. ........

They are all Peaceful Creek reprints.

BarnyardEngineering · Sep 12, 2022

(quoted from post at 06:49:04 09/12/22) I didn't buy this girl to become a full time tractor mechanic. Is the bushing set only available from JD or is the coupling not a proprietary item and commercially available? I assume the belt is just a regular old v-belt.

The coupler doesn't look like anything standard, and I would not expect Deere to use anything standard.

You may as well get the belt at Deere while you're there.

Not sure if buying an old worn out machine is the right way to not become a full time tractor mechanic, LOL.

Tx Jim · Sep 12, 2022

(quoted from post at 07:24:34 09/12/22) If you are going to have the tractor for a while and take it apart for the belt, zip tie a second belt in there for the next
time.

Due to relative ease of disassembling hyd pump drive coupler I would advise anyone not to zip tie an extra fan belt on tractor. Hyd drive coupler bushings would more than likely need replaced before another fan belt would need replacing unless fan belt pullies are extremely worn.

NHEngineer · Sep 12, 2022

You may as well get the belt at Deere while you're there.

Not sure if buying an old worn out machine is the right way to not become a full time tractor mechanic, LOL.

Can I get the belt and coupling bushings through this forum?

NHEngineer · Sep 12, 2022

I found the coupling bushings here but not the belt. No listing.

Jim.ME · Sep 12, 2022

(quoted from post at 10:34:23 09/12/22)
I found the coupling bushings here but not the belt. No listing.

Your local auto parts store should be able to cross the JD number, or match the old belt. If there is a heavy-duty option, like a truck belt vs plain automotive, get the heavier one. I prefer the cog type over the solid ones, I think they wrap to the pulleys better.

NHEngineer · Sep 12, 2022

OK & thanks.

Tx Jim · Sep 12, 2022

I think this belt from YT will be fine.

JD-400-D Loader/Backhoe fan belt

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