Front Drive 1500D

[VT_Hokie]

Ok guys I need your help.

History: I was raking my newly cleared land on a high grade and put the tractor in reverse to back up. With in a course of a foot, both front wheels bucked in and bent the steering rod into a "U". I have since had the rod straighted and have it driveable in 2wd. When I jack the front up and spin the tires one will go one way and the other in the other direction when straight. When I turn the wheels hard one will spin and the other will not. When I parallel again the other side will not spin and I get a clicking sound from the area of the diffy. When I set it down and spin it again it seams OK for a moment but continue playing will only get only one tire spining with the clicks. This happen regardedless of gear I had it in (without engine running) or shifting between 2wd or 4wd. The only thing I can add as a precurser to the problem is that when I was working it under extreme load digging out a ditch that both front wheels were shaking and not going anywhere when backing up with a full load on the FEL.

Where I am at:

I have brought my tractor back to my shop and have committed to tearing the front end apart, but need direction in doing so.

As I understand it, all of the repair manuals are in a Japanese and well, very unhelp full. I do have the the exploded diagrams from Hoye (my hat is off to you guys!) that I will use as a base for my exploritory surgery. Since I am commited, as the saying goes "in for a penney, in for a pound" I would like to look for and replace any trouble spots during the the tearing down process. More importantly the actual steps in the removal/disassmembly process and any special tools I will need would be very helpful. I know this is now simple task, but if I the local guys can not put a bushhog together right the first time how can I trust them with Yanmar Diffy?

Thanks for your humble knowledge.
VT Hokie

 

[BruceR]

VT,

Have you considered the possibility of a manual for the American market Yanmars ? Plus there are several members here who could probably do it with their eyes closed.

Bruce

 

[normde2001]

I would do more troubleshooting before blindly tearing into it. Try to determine if just 1 side is bad, and go after the clicking sound.

 

[lens12]

See if you can determine where the clicking is. You probably have a final drive problem. Unbolt the steering arm to drop the lower final drive & inspect. Metric wrenches are the only tools needed. I can supply some parts. Some parts are not available. There 2 styles of YM1500 front axles. Need to know if steel or cast clutch housing.

 

[VT_Hokie]

Here is a little more info on the problem after I got it in the shop.

In two wheel drive:

Both tires will spin the other in the opposite direction and move the drive shaft regardless steering angle. Low level clicking comming from the outer drive hubs. Seems like the opposite will click louder than the tire I am spinning.

In 4WD:
(drive shaft prevented from turning)

The left side tire becomes disengaged and becomes quite when the axle is tilted up. Pushing down gives loud clicks in th outer housing.

The right side tire seems to be trying to engage the diffy.

From this condition shifting back to two drive:

Left side doing the same thing as in 4wd and the right is also doing the same thing. Now when I spin the drive shaft the right tire is moving a little but the gears are not engaging fully (more clicking from the hub).

Now I drop the front down, go back a foot, go forward a foot (2wd), jack it up and spin the tires. Both work fine as when I first started. All external bolts are tight.

Any ideas? Too much shaft play?

 

[MichiganBilly]

I agree with Len. It sounds like the outer drive housing(s).
You need to figure out wether you have an old style or
new style 1500D before you go much further.

I'd tear down the front outer drive housings and inspect. You'll need to pull
those to really tear down the front diff anyway. I've rebuilt mine
on my old style 1500D twice. There is a DOUBLE BEVEL gear that is nowhere to be found for mine. So now I only use 4WD when stuck. :-( Supposedly there is a production run scheduled for these gears, but I've been hearing about that for over a year now and still none avail. to buy.

IF ANYONE OUT THERE HAS OLD STYLE 1500D ONE-PIECE DOUBLE BEVEL GEARS FOR THE OUTER DRIVE HOUSING KINGPIN SPINDLES I've got $$$ for those gears!!!

Good luck and post if you get into specific questions.

BTW....when you tear down the outer drive housings be sure to replace all seals (especially the large dia. one).

BillyBob

 

[VT_Hokie]

Figured out the problem. There was too much play in the steering arm connection that holds the lower outer housing to the upper when the wheel is suspended. This caused the gear knuckle to drop away from the axle gear and slip. I did have some hard wear on the gears but not enough to warrant replacement. Replacing the top washer and adding another along with a fatter bolt (5/16") took care of it. The gears and bearings on the other side looked new! I must say that I was rather impressed by the machining, tolerances and material used in the bearings and gears and their condition after 30 years. This thing can easily go for another 30 (and maybe alot more) if taken care of properly. Makes you wonder how today's tractor manufacturing compares. I guess it is like cars, some are put together well and some are not. Anyway a grand thankyou to those offering advice.

 

[Cord]

If you don't have the axle together yet, check the nut on the axle. Often it loosens up causing the axle to wobble, loose it's oil and then self destruct.

 

[Swabby146]

Bill, I had the same problem with my ym1500d after the gears, bearings, and shaft self destructed. I found the double bevel gears at Hoye Tractor. Not cheap but they were available, listed under Ym1500d Green

Frt Knuckle Gear, Code: HSG-1425