My tractor appears to have a mixture of studs and bolts securing the trumpets to the transmission housing (13 on each side), with assorted nuts, some self-locking.
Some of the nuts are badly rusted and need replacing. Think I have an oil leak from here as a result.
Can someone give me the sizes of the studs/nuts, as the parts list doesn't seem very clear on this.
Can I just replace the nuts one by one, without fear of altering any pre-loads?
It is 7/16" dia, 1.7/8" long with flat bottom and slightly rounded top. The housing end has a UNC thread 7/8" long. The nut end has a UNF thread 3/4" long.
Nuts appear to be 11/16" AF.
Am I correct in thinking that there should be 13 such studs on each housing? And that originally the UNF nuts were metal self locking type (with no spring washers)?
I guess that now replacements will need to have springs under them? According to the manual, nuts should be torqued to 50ft.lbs (68Nm)
Ben,
Your post prompted me to do some research, I searched the internet and found that the nuts fitted to my tractor are known as "Philidas" nuts. They are available on Ebay but are not cheap.
I also checked the parts manual and under Fig 9 Differential Housing, are listed 26 x 7/16" x 14 bolts, axle housing to shaft housing, which suggests that bolts and not studs were fitted!
I suspect that may be an error in the entry in the Parts List, because in Fig 7 Rear Axle and Differential, there is reference to two types of nuts (26 off). I suspect someone had another sleepy day a Dagenham, as the Workshop Manual certainly refers to studs.
Why would self-locking nuts be used here and apparently nowhere else on the tractor - aesthetics perhaps?
In my parts manual it states that from the O1/59 the nuts changed from 7/16 x 20 hex to 1/2 x 20 self locking. However I couldn't find any mention regarding the studs which were fitted!
Gerald
Last edited by Tubal Cain on Mon Aug 26, 2013 7:41 pm, edited 1 time in total.
Tubal Cain wrote:In my parts manual it states that from the O1/59 the nuts changed from 7/15 x 20 hex to 1/2 x 20 self locking. However I couldn't find any mention regarding the studs which were fitted!
Quite!
The nuts on my diff are 7/16" dia UNF, 11/16"AF, neither of above!
Sorry to resurrect this thread.
Does anyone know where to find these studs and nuts?
Having taken off a redundent auto hitch top section (the rest was missing) I am in need of 3 each side.
A T engineering at brock , nr. Preston are HIGHLY recommended by me , very rare they don't have the nuts/ bolts for me .
do n't think they stock studs tho tbh
01995 640058
they love farmers going in with rusty /stinky crap wanting a new shiny bolt
Some mornings I wake up grumpy, but most mornings I let her sleep in.
