Chieftain final drives

#1
Does anyone have in their photo collection a good shot of Chieftain final drive with the hub removed? I need this to clear up a small point in the 1/6 model I am building.. All my shots show every other bloody bit but not that, in fact only ever saw the hub come off once so I am keeping fingers crossed.
 
#3
There are still Chieftain AVLB and AVRE out there. So if someone hasn't got a photo, there's a chance that someone could get one..... just a question of when ?? :?

Edited 'cos I can't spell Chieftain apparently :roll:
 
#4
commander said:
Does anyone have in their photo collection a good shot of Chieftain final drive with the hub removed? I need this to clear up a small point in the 1/6 model I am building.. All my shots show every other bloody bit but not that, in fact only ever saw the hub come off once so I am keeping fingers crossed.
what do you need to know? ill certainly help if i can!
 
#5
Thanks army surplus, what i need to find out is the drawing shows (not very clearly that the outer face of the assy was not flat but has a lip where the drive sft comes out, this is suspect is part of the dust sealing for the bearings. Once spent ages chaning one of these but it did not flick my switch to take photographs then. Any help much appreciated.
 
#6
Contact the Workshop/LAD of one the Armd Engr Regts, they've all got Chieftains. There are 89 of the still in service, so a good proportion of them are likely to be decorating the Wksp in component form at any time.

Plant Pilot, you got any? Could you PM him your ASM's number?
 
#7
Or try ATSA/MSG/SEFIT or whatever they're calling themselves this week. PM me and I'll give you some contact details.
 
#8
Sorry no, we've only got modern kit in our regiment, you know 1980s+. And no big armour so youl need one of the Bde Support Regiments as there are just Armd Engr Sqns part of them now, no Armd Engr Regts anymore.
 
#9
commander said:
Thanks army surplus, what i need to find out is the drawing shows (not very clearly that the outer face of the assy was not flat but has a lip where the drive sft comes out, this is suspect is part of the dust sealing for the bearings. Once spent ages chaning one of these but it did not flick my switch to take photographs then. Any help much appreciated.
do u mean a lip on the final drive where the sprocket carrier bolts on? im not entirely sure i know where u mean at the mo, if you ring this number im sure you will get the anwer you require. its bovvy tank museum number. (+44) (0)1929 405096
 
#10
Army surplus thanks for the reply no the face I mean is the outer face that is next to the sprocket hub. Same face as the access for the quill shaft cap. I will not waste my time calling Bovy as they have absouletly nothing there of any use (I know as I poured through it for my Chieftain book)
 
#12
Your help is mich appreciated, seems that the Regiment can actually help one of the Old comrades thinks he has one.
 
#14
Commander

Spent 16 years fixing Chiefies at both RAC and Armd Engr units, have a fairly good knowledge of beast. I'm not sure which bit you are on about. The quill shaft end cap on a Chieftain is on the final drive casing itself well away from the hub assy. I think you may be getting mixed up with a CR1 quill shaft end cap which is located in the end of the hub.

The hub slides over the final drive output shaft which is part of the final drive assembly. This in turn is secured by a huge splined "mushroom" that locates inside the final drive output and bolts onto the hub, hence securing it all together. There is no lip or dust seal. Chieftain was never designed to go fast enough to generate dust!!!! Seriousely, the way the thing was designed meant that when assembled no working parts were exposed to the elements

An easy job to strip and re-assemble if you have arms like Charles Atlas made even easier if you happen to have a crane to hand. Have changed or stripped down lots of final drives over the years, but not in at least 7 years.

I hope the info is of use to you, would be happy to answer any other questions on the old beastie.
 
#15
Hi Tiffy

No its not the quill shft or its end cap (and bloody grub screw) it is the actual main casing were the actual shaft for the hum comes out. The drawing shows a raised lip whic I feel is a dust cover as the hub is pushed along the shaft and located it marries up with this plate. This is similar to the plate found on the idler wheel axle. This lip is very prominent in the works drawing, just thta I can not recall it
 
#17
Hi guys, I'm new here but I hope you won't mind my input. There was no drive shaft to the final drive as far as I can remember. Drive was produced by the quill shaft coming out of the gearbox. I do remember the only time I ever changed a final drive, at Catterick in 1979, there was no raised flange just a machined internal rim which the final drive assembly fitted into - metal to metal.

It was a helluva job on that particular panzer and I do recall having to go see the tiffy to try and overcome the fact that the assembly wouldn't push in - even with a CVRT being used as the forward pressure. He supplied us with an old Cent tool which was basically just a square section of oak, about six feet long with two metal sections slid over it front and rear with handles fashioned into them. In effect, a bloody great battering ram.

It worked.
 
#18
GDav
Welcome to the site, there is a shft other wise the hub has nothing to sit on, drive taken to it from muff coupling which were set in place by the quill shaft, but as i am sur you have read that is not the question orginally lodged.
 
#19
Thanks for the welcome mate.

I'm 90% sure there is no other shaft. Take out the quill shafts and the panzer sits still. The drive is transferred from the quill shafts to another splined coupling which engages with splines on an extension to the FD assemby but it is an indirect drive.

I'd forgotten this bit earlier (it was 1979) the final drive assembly has two shoulders. One is smooth and slides into the machined housing and the other shoulder is splined. You could be forgiven for thinking the splined bit is a shaft but to the best of my knowledge it ain't.

That was the only time I saw one taken apart. The panzer was an old 3XY which was used for driving instruction on the tankadrome at Cambrai Lines. I do remember who the SI was though - he was RH and was known as "The Mouth". :D
 
#20
Gdav

I know what you are saying but there is a shaft axle what ever you want to call it that protrudes from the housing for the sprocket hub to sit on. Were that shaft comes out there is a flange which is what this question was all about, as the drawing does not show it very well. The splines are the ones thta the muff fits over and are held by the quill shaft as you correctly say pull quill shaft out this withdaraws muff hence no drive.
 

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