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11-12-2021, 10:42 AM
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#15
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Senior Member
Join Date: Oct 2014
Posts: 7,882
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To cure a "pull", it is more the difference in caster between the left and right than absolute caster that counts.
You want at least .5 degrees more on the Right to compensate for road crown.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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11-14-2021, 04:18 PM
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#16
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Junior Member
Join Date: Dec 2020
Location: Harrisburg,Pa.
Posts: 21
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I got the alignment sheet out of the coach today. Here is what is on it. front axle left: 4.4 degreee castor. front axle right: 4.6 degree castor spec range 5.0 to 7.0 degree cross caster is -0.2 degree. spec range is -.05 to 0.5 degree. This is specs for Roadmaster chassis with Rockwell/Meritor axle. I dont know if its the same for the peak chassis. not sure how to find them. sorry for being slow, but had to trouble shoot my hwh system after my jacks wouldnt extend. Shuttle valve coming tuesday. Thanks,KentZ
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11-14-2021, 04:24 PM
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#17
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Senior Member
Join Date: Oct 2014
Posts: 7,882
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Sorry, I don't have Peak chassis/Alpine alignment specs either.
BUT (yes, large BUT) .2 degrees more caster on right side WILL cause virtually any coach to pull to the right.
1/2-3/4 degrees more caster on the right side will help compensate for road camber.
Go toward the higher end of caster specs, and make sure the right side is 1/2-3/4 degree more than left.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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11-14-2021, 04:43 PM
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#18
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Senior Member
Join Date: Oct 2014
Location: Camas, WA
Posts: 292
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I believe the caster specification for a peak chases is 4.2 degrees min and 5.2 degrees max for left and right.
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Rick T
2006 Alpine 34FDDS
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11-14-2021, 05:03 PM
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#19
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Senior Member
Join Date: Oct 2014
Posts: 7,882
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Quote:
Originally Posted by rrthor
I believe the caster specification for a peak chases is 4.2 degrees min and 5.2 degrees max for left and right.
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With what delta left/right???
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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11-14-2021, 05:14 PM
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#20
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Senior Member
Join Date: Oct 2014
Location: Camas, WA
Posts: 292
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Quote:
Originally Posted by wolfe10
With what delta left/right???
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.5 degrees max.
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Rick T
2006 Alpine 34FDDS
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11-14-2021, 05:31 PM
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#21
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Senior Member
Join Date: Oct 2013
Posts: 1,859
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I have this saved in my alpine coach stuff:
__________________
2001 Alpine Coach 38/8
ACA 2018006
Andy
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11-14-2021, 06:18 PM
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#22
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Junior Member
Join Date: Dec 2020
Location: Harrisburg,Pa.
Posts: 21
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Sounds like they might have to bend the axle a little to get more cross caster. I think the guy is good and knows what to do. But when he did the rear, it took longer then he quoted. The shop manager was gonna knock some money off the bill, but I told him not to worry about it as long as he would warrant the job. He agreed whole heartily. Now he is locked in to fix it no matter what. You guys helped me understand what is going on so I know what I am talking about now. I take it down Wed at noon and I think it will be fixed this time or I might ask for my money back. KentZ
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11-14-2021, 07:01 PM
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#23
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Senior Member
Join Date: Oct 2014
Posts: 7,882
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Very likely the .5- .75 degree difference left to right can be achieved with a shim with no need for axle bending. Yes, we are talking about less than one degree difference.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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11-14-2021, 07:10 PM
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#24
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: May 2016
Location: Kamloops, BC, 60 miles from the Center of the Universe according to the Rinpoche, of the SF monks.
Posts: 7,397
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Go for max (7 degree) castor! It will drive so much better. 
Our MH is 39 feet long, AND just a gasser, but it's so nice to drive with 7 degrees of castor. I normally just have my left thumb and forefinger on the wheel, even while passing and being passed by semis. 
__________________
Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand! 
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11-15-2021, 06:51 AM
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#25
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Senior Member
Join Date: Oct 2013
Posts: 1,859
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Clean Sheet 
PDF form attached.
__________________
2001 Alpine Coach 38/8
ACA 2018006
Andy
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11-18-2021, 07:38 PM
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#26
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Junior Member
Join Date: Dec 2020
Location: Harrisburg,Pa.
Posts: 21
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Took the coach down for the alignment Yesterday and it seems a lot better. Tomorrow we leave on a trip for a week or more and will be able to tell if it is good. I think it might still pull a little to the right,but it might be me. regardless it is a lot better than before. He ended up setting the cross caster at -0.9 degree . Left side 5.2 and right side at 6.1. Toe is .06 Camber Lf is-0.1 and RF is-.02. I had asked him for a minimum of 6 degrees caster and .05 degree of cross caster and this is what he gave me . If anybody has any thoughts on this I appreciate it. Again I thank everybody for there help. KentZ
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11-18-2021, 08:25 PM
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#27
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: May 2016
Location: Kamloops, BC, 60 miles from the Center of the Universe according to the Rinpoche, of the SF monks.
Posts: 7,397
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The extra castor will make a big difference in your enjoyment driving your rig.
A slight pull to the right should be even less with the extra castor.
Adding a stabilizer such as a Roadmaster can eliminate a slight pull also.
__________________
Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand!
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11-19-2021, 06:19 AM
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#28
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Senior Member
Join Date: Oct 2014
Posts: 7,882
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Looks fine to me.
As mentioned for safety reasons, you want a very slight pull to the right.
That is so the vehicle will not wander into oncoming traffic from a little inattention.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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