D4 7U Steering Clutch Question

Hi Inter674,
as announced in the June 11 1954 Service Magazine article the steering clutch has been improved.
The main change was a helical cut 8 splined hub and discs to suit.

In essence it states:-
The normal stack height thickness for the faced and steel discs of one clutch is :- 3 1/32"
The minimum worn stack height is :- 2 19/32"

It seems your clutches are right there for max. stack height.

From specs I have for the D4C 39A-40A
Max. average stack height for 11 new lined disc assem's. and 10 steel discs = 2.787" to 3.093"
Min. stack height = 2.63"
These specs seem to align with the later D4 U series clutches.
Cheers,
Eddie B.

[quote="edb"]Hi Inter674,
as announced in the June 11 1954 Service Magazine article the steering clutchhas been improved.
The main change was a helical cut 8 splined hub and discs to suit.

In essence it states:-
The normal stack height thickness for the faced and steel discs of one clutch is :- 3 1/32"
The minimum worn stack height is :- 2 19/32"

It seems your clutches are right there for max. stack height.

From specs I have for the D4C 39A-40A
Max. average stack height for 11 new lined disc assem's. and 10 steel discs = 2.787" to 3.093"
Min. stack height = 2.63"

Cheers,
Eddie B.[/quote]


Wow, I knew this forum was good, but this rapid response has exceeded all my expectations, and saved me a heap of work. I feel confident to leave it be now👍

Thanks again.

I had been using this chart and the specs published by General Gear.
What is correct?????

Hi Team,
from my research (posted above) yesterday on this subject I determined that the chart OM has scanned above is correct for G, J, T, and early U Series machines with multi-fine splined inner drums and Rivetted lined discs.

With the change to the helical cut 8 splined inner drums and the Sintered bronze lined/faced discs, the Service Magazine article gives the NEW Specs for the Later style clutch, posted above.

My D4 6U1 to 6U9988 Parts Book shows a change of the following items from the former Rivetted lined discs, steel discs, and inner drum, to new sintered bronze lined discs, steel discs and inner drum at S/No 6U9782.
Sorry I do not have a 7U Parts Book to give you the change over S/No for the 7U machines.

Hope this helps someone in future.
Cheers,
Eddie B.