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AuthorTopic: LT230 input gear preloading  (Read 5449 times)

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Offline Saffy

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LT230 input gear preloading
« on: September 18, 2009, 14:26:14 »
I am soon to swap my defender transfer box for a disco one. The disco box needs the input gear changing for the crossdrilled type as it is worn old type.
My document here https://docs.google.com/Doc?docid=dhfmtstj_0ghdpj7jh&hl=en give a lot of info for reference ...

...but...
I am confused how to check and set the preloading whilst the gearbox/mainshaft is still on the truck as the destructions say to move the mainshaft back and forth and measure on a dialgauge to calculate shim required.

5. Position suitable DTI with stylus of gauge contacting end of mainshaft, push mainshaft rearwards and zero gauge.
6. Push mainshaft forwards and note gauge reading.

How the hell...?

It's the only bit of job I am worried about  :?
« Last Edit: September 18, 2009, 14:27:48 by Tanglefoot »
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Offline V8MoneyPit

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Re: LT230 input gear preloading
« Reply #1 on: September 18, 2009, 17:45:14 »
Surely it's the input gear end float you are measuring, not the mainshaft? It's about a year since I did mine, so I'm struggling to remember how I did it!

You should take a very carefull look at the gearbox output shaft too. On mine, both the shaft and the transfer box input gear were totally shot.
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Offline Saffy

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Re: LT230 input gear preloading
« Reply #2 on: September 18, 2009, 17:58:20 »
Quote from: V8MoneyPit on September 18, 2009, 17:45:14
Surely it's the input gear end float you are measuring, not the mainshaft? It's about a year since I did mine, so I'm struggling to remember how I did it!

You should take a very carefull look at the gearbox output shaft too. On mine, both the shaft and the transfer box input gear were totally shot.

*shrug* I thought that's what I was supposed to be doing, maybe the workshop manual has a typo and says shaft instead of bearing, it's bugging me.

Yeah, the tranny on the defender at the moment, I had a looksee today and phew... it's a cross drilled bearing and the shaft is as virginal as can be... big feeling of relief when I saw that. The worn gear I mentioned was from the disco tranny, which is box that I am going to fit on my defender. I wouldn't have liked to have been the owner of the disco the box came off that's for sure. If I'd had known I wouldn't have bothered ordering a new bearing as the one from the defender is exactly same 26 teeth, 129mm length cross drilled jobby that I am ordering.
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Offline Saffy

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Re: LT230 input gear preloading
« Reply #3 on: September 18, 2009, 21:15:17 »
Have re-read and I am now confident it really means move the input gear back and forth to measure the float and do the calculation as per manual. I will do that while the tranny is off the truck. The shim that's is in there at moment is the 3.15mm thinnest one so that's a good start, if I need a different shim size I will order it at same time as the oil seal.

FRC9926   Shim - Mainshaft Gear - 3.15mm - LT230   
FRC9928   Shim - Mainshaft Gear - 3.20mm - LT230
FRC9930   Shim - Mainshaft Gear - 3.25mm - LT230          
FRC9932   Shim - Mainshaft Gear - 3.30mm - LT230          
FRC9934   Shim - Mainshaft Gear - 3.35mm - LT230          
FRC9936   Shim - Mainshaft Gear - 3.40mm - LT230          
FRC9938   Shim - Mainshaft Gear - 3.45mm - LT230          
FRC9940   Shim - Mainshaft Gear - 3.50mm - LT230          
FRC9942   Shim - Mainshaft Gear - 3.55mm - LT230          
FRC9944   Shim - Mainshaft Gear - 3.60mm - LT230          
FRC9946   Shim - Mainshaft Gear - 3.65mm - LT230          
FRC9948   Shim - Mainshaft Gear - 3.70mm - LT230          
FRC9950   Shim - Mainshaft Gear - 3.75mm - LT230          
FRC9952   Shim - Mainshaft Gear - 3.80mm - LT230      
FRC9954   Shim - Mainshaft Gear - 3.85mm - LT230          
FRC9956   Shim - Mainshaft Gear - 3.90mm - LT230      
FRC9958   Shim - Mainshaft Gear - 3.95mm - LT230          
FRC9960   Shim - Mainshaft Gear - 4.00mm - LT230
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Offline sv130

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Re: LT230 input gear preloading
« Reply #4 on: September 19, 2009, 09:48:10 »
It does mean move the input gear back and forth.

 Gaz
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Offline Saffy

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Re: LT230 input gear preloading
« Reply #5 on: September 19, 2009, 10:38:01 »
so guys... what do you do if there is no end float (turns nice and freely though) and it's got already got thinnest shim in and is a model that not supposed to have a gasket fitted?
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Offline topless matt

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Re: LT230 input gear preloading
« Reply #6 on: September 19, 2009, 10:48:01 »
Leave it well alone  :lol: :dance:
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Offline Saffy

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Re: LT230 input gear preloading
« Reply #7 on: September 19, 2009, 11:09:47 »
Quote from: topless matt on September 19, 2009, 10:48:01
Leave it well alone  :lol: :dance:

won't tighten up and cause damage when running at full temp then?
http://74.200.83.64/forum/showthread.php?s=112161688c0a47cc5b604692d71303f3&t=7367
« Last Edit: September 19, 2009, 11:43:41 by Tanglefoot »
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Offline Saffy

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Re: LT230 input gear preloading
« Reply #8 on: September 19, 2009, 12:05:23 »
Okay I have found alternative method in a different version on the LT230 overhual manual to check the preload on the input gear using a spring scale, as long as it's a load-to-turn of 2.26 kg to 9 kg (5 lb. to 20 lb.)  then it is ok. Mine rotates at 7lb

http://jimsrover.afraid.org/rover/gtr_References/Trainnning_GearBox/LT230_Overhaul.pdf
« Last Edit: September 19, 2009, 13:33:45 by Tanglefoot »
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