D4 7U Steering Clutch Question

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Inter674

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I have a late model D4 7U equivalent and the book says the steering clutch width should measure no less than 3 1/8" . Mine measure a little less than that but I know the clutches were replaced a few years ago and were working fine before the pull down. I also have a spare set from another machine of similar age that measures exactly the same as the ones in question. Each has 11 toothed disks.

I don't want to pull it apart if I can help it, and looking closely I can see friction material on each side of the plates.

Question: is the minimum width of 3 1/8" applicable to all 7U steering clutches, or just to the early ones? I know the early ones had more plates (12 I think) and presumably may have been thicker as they were rivetted, not bonded.

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Thu, Sep 6, 2012 10:47 AM

edb

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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.

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Fri, Sep 7, 2012 10:12 AM

Ray54

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If you have the clutch out of the tractor add more plates,it will be slipping very soon if you don't.I have never seen a metallic Cat plate pile up like the fiber ones,so I have used some very thin used plates as long as the drive teeth were not real shape.They lasted much better than I hoped.Were it says add one I used 2 or 3 more than original did.Was very nerves it would be to many as I couldn't find a maximum height,but it worked.A few days ago someone posted a chart with minimum as well as maximum height for the old Cats. It may have been on Antique Caterpillar Machinery Enthusiast rather than here. Good luck to you.
Ray

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Fri, Sep 7, 2012 10:13 AM

Inter674

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Reply to edb:

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.

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Fri, Sep 7, 2012 10:18 AM

Old Magnet

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Reply to Inter674:

[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?????

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Fri, Sep 7, 2012 9:24 PM

edb

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Reply to Old Magnet:

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.

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Sat, Sep 8, 2012 6:41 AM

Old Magnet

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Reply to edb:

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.

The 7U equivalent change occurred at s/n 26503-up.

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Sat, Sep 8, 2012 8:30 AM

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