ACMOC
Login
ACMOC
D4 Clutch Problem

D4 Clutch Problem

Showing 1 to 5 of 5 results
Neil Porter
Topic Author
Offline
Member
Send a private message to Neil Porter
Posts: 18
Thank you received: 0
Hi - Thank you with the help with the thermostat removal help. I now have a different problem
with the same early D4 Cat. When the clutch is engaged completely and the clutch lever goes over center
and locks in the engaged position, the clutch works fine. Problem is when I disengage the clutch
is does not disengage even though I have thrown the clutch lever all the way forward. If you just slip
the clutch without fully engaging it it always releases. But when you pull it all the way in it does not usually release
which can make things exciting the first time that happens to you. I either have to slip it out of gear
or idle the engine down until it dies. Sometime if I keep snapping the clutch leaver forward it will release
but it needs to release every time. If I take the cover off and watch the clutch linkage while it is running
the "yoke" that moves with the clutch lever moves forward and back ever time. But the clutch does not
always follow it back and stays engaged. It is a bit oily in there so I wonder if the oil on the clutch disk
is causing it to stick or is there some adjustment to the clutch or linkage that I can make to solve the problem.
Any help would be appreciated. Thanks. Neil
Please log in or create an account to join the conversation.
Tue, Sep 12, 2017 10:45 AM
ol Grump
Offline
Send a private message to ol Grump
Posts: 1,077
Thank you received: 0
What may be happening is someone along the line overgreased the pilot bearing and the excess grease is what's holding the clutch plate to the flywheel when you try to disengage it.

With the engine not running, try engaging and disengaging the clutch, you should hear a slight "clunk" when it disengages. If not, add maybe a gallon of diesel to the clutch housing, then start working the clutch lever a bit. Turn the engine a quarter turn and repeat, then another quarter turn and repeat, By the time you've turned the engine a full turn and worked the clutch lever, you should hear the aforementioned "clunk".

It won't hurt to leave the diesel in the clutch housing for a bit while you run the critter, it'll help wash the grease off everything.
Please log in or create an account to join the conversation.
Tue, Sep 12, 2017 6:13 PM
catsilver
Offline
Send a private message to catsilver
Posts: 1,644
Thank you received: 0
The clutch thrust bearings at least are worn out and/or you have a lot of slack in the linkage and operating yoke, time for an inspection of where the problem lies and fixing it before you have an accident.
Please log in or create an account to join the conversation.
Tue, Sep 12, 2017 6:16 PM
Neil Porter
Topic Author
Offline
Member
Send a private message to Neil Porter
Posts: 18
Thank you received: 0
Reply to catsilver:
The clutch thrust bearings at least are worn out and/or you have a lot of slack in the linkage and operating yoke, time for an inspection of where the problem lies and fixing it before you have an accident.
Thank you for the repair suggestions. There was enough oil in the bottom of the bell housing
that the flywheel had picked it up and spread it all over the clutch and disk causing it to stick.
I sprayed diesel on to the clutch and flywheel under high pressure rinsing off the oil. I then
pored enough diesel in that the flywheel picked it up and sprayed it around all the while I was
working the clutch. After draining the bell housing by pulling the bottom plug, I then sprayed
two cans of brake clean to rinse the diesel off. Now works as it should. Would not have thought
oil on the disk would cause it to stick so badly but it did. Thanks. Neil
Please log in or create an account to join the conversation.
Sat, Sep 16, 2017 11:20 AM
ol Grump
Offline
Send a private message to ol Grump
Posts: 1,077
Thank you received: 0
Reply to Neil Porter:
Thank you for the repair suggestions. There was enough oil in the bottom of the bell housing
that the flywheel had picked it up and spread it all over the clutch and disk causing it to stick.
I sprayed diesel on to the clutch and flywheel under high pressure rinsing off the oil. I then
pored enough diesel in that the flywheel picked it up and sprayed it around all the while I was
working the clutch. After draining the bell housing by pulling the bottom plug, I then sprayed
two cans of brake clean to rinse the diesel off. Now works as it should. Would not have thought
oil on the disk would cause it to stick so badly but it did. Thanks. Neil
I'm glad that the diesel rinse worked well for you. Usually the culprit is someone had over-greased the pilot bearing and the excess grease got on the flywheel/clutch disc.

A quick hint about oil in the clutch housing, unless you plan on working in water, take the drain plug out and drill a 5/16" hole in the center, then drop a 1/4" cotter key in and bend the legs. As it's running, the cotter key will rattle around an let any accumulated oil pass by on to the ground.
Please log in or create an account to join the conversation.
Sat, Sep 16, 2017 6:49 PM
Neil Porter
Topic Author
Offline
Member
Send a private message to Neil Porter
Posts: 18
Thank you received: 0
Reply to ol Grump:
I'm glad that the diesel rinse worked well for you. Usually the culprit is someone had over-greased the pilot bearing and the excess grease got on the flywheel/clutch disc.

A quick hint about oil in the clutch housing, unless you plan on working in water, take the drain plug out and drill a 5/16" hole in the center, then drop a 1/4" cotter key in and bend the legs. As it's running, the cotter key will rattle around an let any accumulated oil pass by on to the ground.
The hole was there in the plug but was plugged by debris. Thanks. Neil
Attachment
Please log in or create an account to join the conversation.
Tue, Sep 19, 2017 11:15 AM
Showing 1 to 5 of 5 results
YouTube Video Placeholder

Follow Us on Social Media

Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.

Upcoming Events

Price Tractor Pull

| Price Oval - Parnell Terrace, 5570. Yorke Peninsula, SA

Price Tractor Pull

| Price Oval - Parnell Terrace, Yorke Peninsula, SA 5570

Cromford Steam Rally

Chapter Two

| Highacres Farm, Dewey Lane, Brackenfield, Derbyshire DE55 6DB, UK

The Century of Caterpillar

| Elkader, 203 Johnson St, Elkader, IA 52043, USA
View Calendar
ACMOC

Antique Caterpillar
Machinery Owners Club

1115 Madison St NE # 1117
Salem, OR 97301

[email protected]

Terms & Privacy
Website developed by AdCo

Testimonials

"I also joined a year ago. had been on here a couple of times as a non-member and found the info very helpful so I got a one year subscription (not very expensive at all) to try it out. I really like all the resources on here so I just got a three year. I think its a very small price for what you can get out of this site."
-Jason N

Join Today!