HD 5 Gearbox Question

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   Hi there, I've come to this site to ask about the HD 5 crawler tractor's gearbox. We have two working HD 5's and a third which was dismantled for spares. One thing we've always noticed is that one is far lower geared than the other.. This was confirmed by my Dad and Grandad in a straight line "drag-race" many years ago. Recently we had to take the gearboxes out of both tractors to replace some seals and we figured it would be an optimal time to swap the gearboxes over, so that the lower geared one was in the 'better' tractor for more pushing power.

When we put the lower geared gearbox into the other tractor and fired it up, however, we found it goes exactly the same speed and has no more pushing power than before.

This is where my question is: If the gearbox itself is not lower geared, what makes the slow tractor go slow? Surely the crown wheel can't be different. Any insight is appreciated!

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HD5guy Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 26 Dec 2018 Location: New Zealand Points: 2	Post Options Post Reply Quote HD5guy Report Post Thanks(0) Quote Reply Topic: HD 5 Gearbox Question Posted: 26 Dec 2018 at 2:03am
	Hi there, I've come to this site to ask about the HD 5 crawler tractor's gearbox. We have two working HD 5's and a third which was dismantled for spares. One thing we've always noticed is that one is far lower geared than the other.. This was confirmed by my Dad and Grandad in a straight line "drag-race" many years ago. Recently we had to take the gearboxes out of both tractors to replace some seals and we figured it would be an optimal time to swap the gearboxes over, so that the lower geared one was in the 'better' tractor for more pushing power. When we put the lower geared gearbox into the other tractor and fired it up, however, we found it goes exactly the same speed and has no more pushing power than before. This is where my question is: If the gearbox itself is not lower geared, what makes the slow tractor go slow? Surely the crown wheel can't be different. Any insight is appreciated!

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truckerfarmer Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 26 Jan 2013 Location: Watertown, SD Points: 3284	Post Options Post Reply Quote truckerfarmer Report Post Thanks(0) Quote Reply Posted: 26 Dec 2018 at 6:48am
	First off, welcome to the forum. I don't have the answer to your question, but if you post this in the construction section you will have a better chance of getting the correct answer. There are a few fellas that have a wealth of knowledge that may be able to give you the correct answer. Oh, by the way, we all love to see pictures of equipment. Good luck.
	Looking at the past to see the future. '53 WD, '53 WD45, WD snap coupler field cultivator, #53 plow,'53 HD5B dozer Duct tape.... Can't fix stupidity. But will muffle the sound of it!