Juan Manuel Terra
Member
Hi, how are you doing? I have the running clearance specifications for the clutches — could someone tell me if this measurement should be taken with the clutch pack compressed or free?
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Cat 120H Transmission
- Thread starter Juan Manuel Terra
- Start date
Nige
Senior Member
This procedure should assist you in establishing the running cleanrance of any particular clutch. It is somewhat generic but in effect what you are measuriing in order to establish the running clearance of a transnmission clutch is the piston movement from the "resting" (released) position to the "applied" position
1. Position the shaft containing the clutch assembly in the vertical position. The end plate of the clutch being measured should face upward.
2. Make sure that the end plate (2) is free to move.
3. Position the tip of a dial indicator on the end plate and zero the dial indicator.
4. Apply air pressure of approximately 140 kPa (20 psi) to the appropriate passage in the shaft for the clutch that is being checked.
5. When air pressure is applied the end plate should move and contact the lock ring (3). When the end plate is in contact with the lock ring determine the distance that the end plate moved from the dial indicator readings. This measurement is the running clearance of the clutch pack.
1. Position the shaft containing the clutch assembly in the vertical position. The end plate of the clutch being measured should face upward.
2. Make sure that the end plate (2) is free to move.
3. Position the tip of a dial indicator on the end plate and zero the dial indicator.
4. Apply air pressure of approximately 140 kPa (20 psi) to the appropriate passage in the shaft for the clutch that is being checked.
5. When air pressure is applied the end plate should move and contact the lock ring (3). When the end plate is in contact with the lock ring determine the distance that the end plate moved from the dial indicator readings. This measurement is the running clearance of the clutch pack.
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Mobiltech
Senior Member
What I find with these transmission is that the back of the pistons will wear down from spinning in the housing. They can also wear on the half moon retainers on the clutch backing plate.
If you have clutch discs slipping out of place you probably have worn pistons.
If you have clutch discs slipping out of place you probably have worn pistons.
Legdoc
Senior Member
WOW, following this thread is starting to give me an ulcer knowing I will probably be opening the tranny on my 120H. I guess I better stock up on antacid.
Jeez,these grader transmissions are some bit of trickery by the sounds of it.
One here on a job yesterday.
Looks fairly new.View attachment 347338
One here on a job yesterday.
Looks fairly new.View attachment 347338