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bluebirdvision
Top Member
USA
1081 Posts |
 Posted - 01/18/2011 : 5:37:36 PM
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While looking at the PO's at work. They have entered in there a few times "Grease Slack Pins" Can someone please tell me what they are...
I seem to remember from the 30 hour SB driver course that I took a while ago might have said that "slack pins" are the part(s) in older Blue Birds (and other brands) that "CRACK" really loud when the bus was making a turn.... I have CRS tho and am not sure if I heard it wrong or understood it wrong.
Thanks
Birdieboy |
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matts4290
Advanced Member
224 Posts |
Posted - 01/18/2011 : 8:06:57 PM
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I already told you, but I would imagine that the grease the slack pins means to grease the components on the brake system. If memory serves me correct, there is a grease zerk on the shaft that turns the s-cam, and one on the slack adjuster itself. I haven't put enough miles on my AA to have to do another grease on it since I did it last year. Its sat most of that time, besides being started and moved around occasionally.
And that crack you are talking about, I always thought was the shackles/ pins for the leaf springs. My TC does it when I make hard turns, but doesn't if I turn the wheel when the bus is stopped.
Anyone feel free to add to, or...correct me if I'm wrong. |
We can't all be conventional!
http://www.youtube.com/user/matts4290 |
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Wolf0r
Top Member
USA
2181 Posts |
Posted - 01/19/2011 : 07:04:29 AM
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| Plastic leaf spring inserts fell out? Or the crossmember at the front of the frame loose. I have found both in the past. |
“The good thing about science is that it's true whether or not you believe in it.”
Neil deGrasse Tyson |
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Thomasbus24
Administrator
USA
4559 Posts |
Posted - 01/19/2011 : 12:19:06 PM
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| I'm putting my money on the clevis pin that attaches the push rod and slack adjuster and by grease they mean "spray with whatever lube ya got". I've heard that some states' inspectors are on a real kick about those things. |
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IBTMech
Top Member
USA
973 Posts |
Posted - 01/19/2011 : 2:59:19 PM
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In the State of Maine a State Police inspection defect is a frozen pin on the air brake slack adjuster, whether manual or automatic.
We lube ours at every service interval with Fluid Film and it works better to keep them free than grease or oil. |
If it doesn't fit, FORCE it.
If it breaks, well, it needed replacing anyway.
Pullin' wrenches for 45 years. |
Edited by - IBTMech on 01/19/2011 3:00:32 PM |
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bluebirdvision
Top Member
USA
1081 Posts |
Posted - 01/19/2011 : 3:29:02 PM
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quote:
Originally posted by Thomasbus24
I'm putting my money on the clevis pin that attaches the push rod and slack adjuster and by grease they mean "spray with whatever lube ya got". I've heard that some states' inspectors are on a real kick about those things.
Thats right. I asked a mechanic I know over at our BB dealer and that is what he said... Thanks |
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08 Thomas EF
Top Member
533 Posts |
Posted - 01/19/2011 : 4:41:36 PM
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| I also experience that same "cracking" in the '10 CE300 I ride. Occasionally on hard turns, fairly often when coming to a stop on a steep hill (however gently). I thought it was a TC2000 thing; our '01 did it on hard turns a lot. I don't think I've ever felt it in our '04 CE200 or '01 AmTran FEs. I've heard it on the '08 and '09 EFs a few times as they take the 90-degree curve in front of the loading zone over a slight bump. |
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Harrison Fire
Senior Member
United States
175 Posts |
Posted - 01/19/2011 : 6:26:56 PM
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quote:
Originally posted by bluebirdvision
While looking at the PO's at work. They have entered in there a few times "Grease Slack Pins" Can someone please tell me what they are...
"CRACK" really loud when the bus was making a turn..
if I heard it wrong or understood it wrong
Grease is a wonderful thing.
Make sure the 2 pins on an automatic slack adjuster are free.
http://www.anythingtruck.com/commercial/airb_rockwell-autoslackadjusters.mv
Use penetrating oil or heat followed by lube if really stuck, then coat with your favorite grease.
(my fav)
http://www.lucasoil.com/products/display_products.sd?catid=14&iid=46&loc=show
When they freeze up brake linings get worn and out of adjustment.
Then the driver has a need to brake hard and the pins suddenly break loose with a bang and the brakes grab.
Drivers around here really notice if the pins get stuck.
"What was that bang from the back of my bus?"
Inspectors complain about the gob of dirt and grease but under that mess the 2 pins will most likely be free.
HF |
My Fleet? (6) 93/99 IH 3800 Thomas and Blue Bird, Hydraulic Brakes, Manual and Auto Trans, (10) 00/06 FS65 Thomas Air Brake and Auto Trans, (2) 06 C2 Thomas and (2) 09/10 IC CE 300, Plus 3 more from another District |
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bluebirdvision
Top Member
USA
1081 Posts |
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Slack Pin
