Max retarder temps?
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05-17-2009, 17:42
Post: #1
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Max retarder temps?
Jerry's post about his first loaded trip reminded me to ask this question:
At what point does the retarder temp become a concern? What's the magic number I need to keep it under to avoid problems? The red line on my gauge is @ 330 so I stay well away from that, but Jerry's post sounded like 260 was bad and that's always seemed middle-of-the-gauge-ok to me. -Ryan '86 PT-40 8V92 |
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05-18-2009, 00:47
Post: #2
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Max retarder temps?
Hi Ryan,
My Foretravel, with Allison 4060 six speed, has the same retarder. It is great to use. We are advised to never exceed 250 degrees. It seems there is different placements of the pick-up/sensor, in different applications. The placement seems to make quite a difference in temp readings.
Raymond Jordan
Foretravel
Maryland
In a message dated 5/18/2009 11:58:21 A.M. Eastern Daylight Time, waynekotila@... writes:
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05-18-2009, 02:05
Post: #3
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Max retarder temps?
Ryan,
My Blue Box book tells me not to exceed 320 degrees but most people believe that to be too high. I error on the side of caution and keep the temp as low as possible just in case. Jerry 85 PT40 --- In WanderlodgeForum@yahoogroups.com, Ryan Wright > > Jerry's post about his first loaded trip reminded me to ask this question: > > At what point does the retarder temp become a concern? What's the > magic number I need to keep it under to avoid problems? The red line > on my gauge is @ 330 so I stay well away from that, but Jerry's post > sounded like 260 was bad and that's always seemed > middle-of-the-gauge-ok to me. > > -Ryan > '86 PT-40 8V92 > |
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05-18-2009, 03:57
Post: #4
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Max retarder temps?
Ryan; I was told by Allison that the tranny could handle going over 300 deg. F. for breif periods so when my tranny guage just passed up the 300 deg mark I would turn off the retarder and rely on the brakes tell it cooled back down thenI would turn the retarder back on. This worked great for years then one day my tranny failed on a trip and after an expensive towing and about another $8,000.00 I had a new rebuidt tranny. The mechanic that did it told me my tranny had been severly overheated andthat it lookedall burned up in side. I was the third owner of the coach and I have no idea how the prvious owners used the retarder but I followed whatthe Allison tech told me.After that experience I would not let the tranny tempget much over 250 deg.
Wayne
1985PT40
From: Ryan Wright To: wanderlodgeforum Sent: Monday, May 18, 2009 12:42:51 AM Subject: [WanderlodgeForum] Max retarder temps? Jerry's post about his first loaded trip reminded me to ask this question: At what point does the retarder temp become a concern? What's the magic number I need to keep it under to avoid problems? The red line on my gauge is @ 330 so I stay well away from that, but Jerry's post sounded like 260 was bad and that's always seemed middle-of-the- gauge-ok to me. -Ryan '86 PT-40 8V92 |
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05-18-2009, 10:40
Post: #5
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Max retarder temps?
Do you only have one gauge? The Allison Op manual says that you should not
exceed 270 at the sump, which is where the transmission gauge normally reads from. 330 is the normal max for the retarder. I have both gauges, and I can tell you that when the retarder is at 300 the transmission is way, way lower than that. Don Bradner 90 PT40 "Blue Thunder" My location: http://www.bbirdmaps.com/user2.cfm?user=1 On 5/18/2009 at 8:57 AM Wayne Kotila wrote: >Ryan; I was told by Allison that the tranny could handle going over 300 >deg. F. for breif periods so when my tranny guage just passed up the 300 >deg mark I would turn off the retarder and rely on the brakes tell it >cooled back down then I would turn the retarder back on. This worked great >for years then one day my tranny failed on a trip and after an expensive >towing and about another $8,000.00 I had a new rebuidt tranny. The >mechanic that did it told me my tranny had been severly overheated >and that it looked all burned up in side. I was the third owner of the >coach and I have no idea how the prvious owners used the retarder but I >followed what the Allison tech told me. After that experience I would not >let the tranny temp get much over 250 deg. >Wayne >1985PT40 |
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05-18-2009, 13:30
Post: #6
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Max retarder temps?
When I thought I had a tranny issue on a long trip last Christmas,(temp went to
230 degrees and the red warning light came on) I stopped and called Allison. The tech came out and inspected my transmission. Nothing appeared to be wrong. Turned out it was the fan alarmstat. Anyway the Allison man said use the retarder judiciously, preferably on "enable" rather than "apply" and run the fan on "manual override" as the temp increases. He said the tranny could go to 350 degrees, but he strongly advised against it. Now, new alarmstat, judicious use of the retarder on enable only and the fan on override and I very rarely go over 200 degrees. For what it is worth. |
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05-18-2009, 16:30
Post: #7
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Max retarder temps?
I have two gauges. My transmission gauge has never seen 230 under my
ownership. It creeps up there going up long grades and has been at ~225 a couple of times, but has never hit that 230 line. Retarder temp is what I'm concerned about - that sucker goes up fast. I've (very briefly) hit 300 a couple of times on long downhill grades. I don't downshift the transmission going down grades - I've always been able to manage just fine between the service brakes and the retarder, with the retarder doing the bulk of the work. Sounds like I'm doing OK, then. -Ryan '86 PT-40 8V92 On Mon, May 18, 2009 at 3:40 PM, Don Bradner > > Do you only have one gauge? The Allison Op manual says that you should not > exceed 270 at the sump, which is where the transmission gauge normally reads > from. 330 is the normal max for the retarder. > > I have both gauges, and I can tell you that when the retarder is at 300 the > transmission is way, way lower than that. > > Don Bradner > 90 PT40 "Blue Thunder" > My location: http://www.bbirdmaps.com/user2.cfm?user=1 > |
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05-19-2009, 22:54
Post: #8
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Max retarder temps?
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