Antique Tractors Forum

Firehog · Last edited by Firehog on Fri Nov 06, 2009 3:28 am; edited 1 time in total

I bought an old HD3, probably made in the '60's. It has a nice straight 6-way blade and a good running diesel, only trouble is the shuttle shift does not give me reverse.

I was wondering if anyone on the forum has tackled fixing the shuttle shift on one of these. It looks like I will have to do some extensive wrenching to get to the inside guts of this, like taking the tracks off and taking the whole rear end of the dozer off. Ugh. Not looking forward to that but it's got to be done. I do have a manual for it that might give me some direction, haven't even checked it yet.

If anyone has some tips on this and how many days it would take to fix would be great. Also, any leads on where I might find parts to fix whatever is broke would be great. Hope it's something simple like a broken bolt!!

Thanks

gemdozer · Posted: Thu Nov 05, 2009 10:07 pm Post subject:

HI I dismantled some HD5 and you need to removed the 2 screws
from the housing shift lever and pull the lever gear shift and look in the hole with a light the patern shift must be mix or the 3 shafts are maybe rusty and use some lubrifiant on.

Firehog

..inside that might just need some lubrication, but the fellow I bought it from had recently replaced the steering clutches and was somewhat mechanically inclined, so it it was an easy fix, he probably would have done it since he could have sold the dozer for quite a bit more if it had a reverse.

gemdozer · Posted: Fri Nov 06, 2009 12:26 am Post subject: hd5

Maybe the guy check in the hole and see a broken head shaft shifting
and had to removed the transmission for repair ? I should have all those transmission used parts on racking.

Firehog

..I want to clean the dozer before I start tearing into it, so I bought a used steam cleaner but the seller did not have an operators manual for it and I tracked the company down (Electro-Magic) and they said they will send me a copy.

I should get it next week and then I will clean it and start taking it apart.

I'll let you know what I find and then we can see if the parts can be found to repair it.

The clutch lever travels freely in both the forward and reverse directions, no binding.

gemdozer · Posted: Fri Nov 06, 2009 1:27 am Post subject: hd5

The lever shift must be brook in the joint where are the 2 screws.

AC 1 · Last edited by AC 1 on Fri Nov 06, 2009 6:15 pm; edited 1 time in total

[quote="Firehog"]I bought an old HD-5, probably made in the '60's. It has a nice straight 6-way blade and a good running diesel, only trouble is the shuttle shift does not give me reverse.[/quote]

Are you sure you have bought a HD5 ? By the above description, it sounds more like a HD3 that you're describing. The HD5 doesn't have a shuttle clutch. How many cylinders does the engine have ?
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Firehog

I don't know why I put in HD-5. It is a 3. I was looking at HD-5 on craigslist just before I posted and guess that number was stuck in my head. Now I got to figure out how to correct that post!!

gemdozer · Posted: Fri Nov 06, 2009 10:21 am Post subject: hd5

HI I am sorry I do't have hd3 transmission parts now.

HECTOR

John(IN) · Posted: Fri Nov 06, 2009 12:45 pm Post subject:

Firehog, I think the HD3 has the same shuttle clutch setup as the HD4. Here is what the service manual says for the HD4.

"Trouble Shooting

Clutch slips in forward or reverse -- not both.

a. check control valve centering adjustment.
b. check clutch for leakage. measure pressure in clutch line between clutch and valve. *pressure should be 220 psi minimum at high idle and 150 psi minimum at low idle. (if clutch seals are not faulty and the clutch line pressure is not within 10 psi of system pressure then the throttling springs at the control spool might be broken or may be too short when compressed solid.)"

Sounds like your problem is in the valve itself and not the clutch which would cause the problem to be in both forward and reverse. That valve should be fairly easy to get to without too much disassembly.
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Firehog

to talk about any higher pressure hydraulics. It does mention an oil pump for the shuttle clutch "located internally in the rear portion of the torque housing" "It's purpose is to circulate oil through the oil cooler and shuttle clutch to make clutch run cooler"

So, looks like I've got some serious disassemblying to do, starting off with taking the tracks off. I located the master pin and as soon as I rotate the tracks where the pin is up front , I will use a small sledge and punch to pound it out. Do you drive the pin out from the inside of the track? Not sure if the master pin has a taper on it or not. Any tricks on getting it to come out easier, like heat the bushing with a torch and spray some diesel on the end s of the pin?

Thanks

John(IN) · Posted: Sat Nov 07, 2009 2:39 am Post subject:

Does the manual you have show where the shuttle control valve is and how to check it?
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Firehog

Are you sure the HD-3 and HD-4 have the same type of shuttle clutch?

John(IN) · Posted: Sat Nov 07, 2009 1:37 pm Post subject:

I thought both had the hydaulic shuttle clutch, but I guess that must have started with the model change to HD4. Your shuttle clutch may be set up like the D15 tractor was.
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