Water Pump Belt Change w/ double roller chain.

[DHastedt]

I'm trying to change the water pump belt on a D4 5T. The PTO shaft to the hydraulic pump has a double roller chain to the the crank with no apparent master link. Can anyone tell me how in the world to remove it to install the belt?

I tried unbolting the hyd. pump to slide the spline off the gear but it's locked. either it's just rusted on or it's bolted from the inside.

Thanks for any help

My paying job keeps me quit busy so my response back will be slow, Thanks again.

Duane

(I'm new to this, please bear with me)

Added pics, maybe it will help.

Also trying to I.D. the brand of blade, (pic 10569)

Thank You,
Duane

[ccjersey]

There will be a connecting link somewhere there.

Are you sure there wasn't another set screw usually 90* to the one on the keyway that was holding the coupling half to the shaft when you tried to get it loose that way?

[DHastedt]

There will be a connecting link somewhere there.

Are you sure there wasn't another set screw usually 90* to the one on the keyway that was holding the coupling half to the shaft when you tried to get it loose that way?

Thank you for the reply,

everyone I talk to says "all chains have a master link" all you have to do is remove it. Either the clip for the mast is on the back side of the chain, or the type of clip this chain uses I've never seen.

OK say the clip for the master link is either on the front (and I just don't see it) or it's on the back side, in either case if you get the clip off there's no room to remove the link because one half of the chains width is in side the pulley with no access to the back side.

Set screw? I know there usually are some but unless there snapped off flush, not on this setup.

I've added pics, maybe that will help.
(I've rebuilt and repaired a lot of things but this CAT is just tearing up my sandbox)

Also trying to I.D. the brand of Blade.

Thank you for any help..
Duane

[Tim Matthews]

From your pictures there is room. You just need to get the 10 year old next store to get in there . No room to bend cotter pins, circlip has to be on back side. Need it off , cut it and get a new chain. Someone got it on there the first time you can too. I have seen them run and stay on with no retainer especially double row chain. Tim

[ccjersey]

If I had to install that connecting link, the only way I would/could have done it was push the link in from the front and then somehow snap the clip on the backside.

Any chance of getting a dental mirror or something similar to look at the links on the back side of the coupling to perhaps see the clip? What about a child with small fingers to reach in there?

It's possible that the clip has long ago fallen off and the wear on the links is what is holding the thing together. You might want to just pry on each link around the circumference of the chain and see if any have any more slack or perhaps it might just come out.

You could always torch a link and replace it once you get the chain off and install the belt. Just make sure you torch the outer plates and not the inner ones so you destroy the part that you can buy just one of! Probably would have to have a modified screwdriver or something similar to get the clip on.

[Kelly]

Duane,
What you have with out any doubt is a LaPlant-Choate dozer with there hydraulic control system. It should be a model 4R trailbuilder for the narrow gauge or a model 4RX trailbuilder for the wide gauge. I don’t recall any master link on the flexible drive coupling. I am sure you will have to take the pump off the front as you have started to do, its no doubt rusted up, but there is one set screw behind the pump, as showing in the drawing.
Check out this Photo of the power take-off for the D4 tractor. check here.
Kelly

[jbernd56]

Duane,
What you have with out any doubt is a LaPlant-Choate dozer with there hydraulic control system. It should be a model 4R trailbuilder for the narrow gauge or a model 4RX trailbuilder for the wide gauge. I don’t recall any master link on the flexible drive coupling. I am sure you will have to take the pump off the front as you have started to do, its no doubt rusted up, but there is one set screw behind the pump, as showing in the drawing.
Check out this Photo of the power take-off for the D4 tractor. check here.
Kelly

Is the attached parts list from Caterpillar or Choate/LaPlante, and can parts still be ordered?

[Ray54]

Look at chain coupling on the left of parts diagram ,it is bolted to the pulley.Is there room to move pump ahead if this coupling is unbolted from the belt pulley?The chain may have the keepers on the back side.Always more fun when there is no room to work.Good luck. Ray

[DHastedt]

Thank you all for your replies. and the diagram print,very helpful!

Hopefully my next post will be a photo of a new belt installed.

Take Care,
Duane

[Kelly]

Is the attached parts list from Caterpillar or Choate/LaPlante, and can parts still be ordered?

jbernd56,
That would be a LaPlant-Choate parts list. The interesting thing about this power take off is it's of a later date. The flexible drive coupling was added later and could be field installed. The flexible drive coupling was interchangeable with the older rigid type coupling and it was to improve the alignment of the pump to the tractor and prolong the life of the spines on the power take-off shaft.

Kelly