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PT & WB (Twin Axle Pusher Unique Issues) If you have a unique issue with your PT or WB model coach and it can't be answered in one of the other forums here, then this is where you can list it....list your PT Parts here too.

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  #1  
Old 07-09-2018
markusfmeyer markusfmeyer is offline
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Default PT throttle return springs

Had an "interesting" situation on the way up to Plymouth MA last week in the coach. About halfway there, I noticed some odd behavior, of course as traffic started to get heavier. It felt like cruise control was stuck "on", meaning the coach would keep going/accelerating when I took my foot off the pedal, especially on downhills. At first it was sporadic, so I got nervous and tried to figure out what was going on. A phone call to Shane got my answer after I texted him pictures of my throttle cable in the engine bay - the spring was missing/broken. Closer observation saw it hanging there by one end. I made it the rest of the way to my destination which was an adventure in and of itself. I ended up buying a pack of carburetor springs and put 2 new ones on, Shane suggested installing a "backup" in case one breaks again.

First 2 pictures show the "lack" of a spring, next 3 show the repair. Yes, I left the "oh sh*t" cable disconnected for now. After it was done, Shane instructed me to test that it wasn't too tight now, that I could still get full throttle. You air up the coach, turn it off, turn key to on, have someone watch the throttle cable in the engine bay while another pushes their foot all the way on the pedal to full throttle. The cable should move thru full range, if not, you will have issues. Luckily my test passed.

Lesson learned? I am adding checking these springs to my pre-flight takeoff list. Also kept the remaining spares (box comes with several in it) on board in case I ever need them again. Hope this helps someone else.
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1986 PT40 6V92
VB 1570
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Old 07-09-2018
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Stick Miller Stick Miller is offline
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Marcus, If I'm understanding correctly, this really had nothing to do with the cruise control. You just had basically a throttle cable that wasn't backing off when you did. Right?

I had a similar experience but mine was due to some fault in the cruise. I couldn't get it to disengage. I was finally able to get it off the road and into the safety of a Cracker Barrel. A call to Shane helped me to remove the airline to the CC. Its on my "to do" list.

Glad you were able to get it sorted out.
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Old 07-09-2018
markusfmeyer markusfmeyer is offline
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Correct, nothing to do with cruise control. The lack of a return spring didn't allow the throttle to back off like it should. Hence behaving like I had the cruise set.
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Old 07-09-2018
oldmansax oldmansax is offline
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Glad springs were the problem. I had a similar issue a couple of months ago that turned out to be the cruise control. I can tell you that going across the Chesapeake Bay Bridge Tunnel at full throttle is no fun.

TOM
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Old 07-09-2018
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I don't know if these will work in this situation but this what is used on my Chevy 350 Quadrajet carb, they can be found at most auto parts stores under the Dorman "HELP" section. The middle one is the version I use on my old work van.






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Old 07-09-2018
markusfmeyer markusfmeyer is offline
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Yes John I bought the springs at Advance Auto Parts in the help section.
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Old 07-09-2018
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Randy Dupree Randy Dupree is offline
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When the PTs were new they had 3 springs on them,no kidding.
I bought a late 84 in 89,and it had 3 springs.


I like Finns spring in a spring.
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Old 07-09-2018
markusfmeyer markusfmeyer is offline
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Shane suggested the spring in a spring. I happened to have two that worked without having to resize them so put them on. Can always modify later and add a third inside one of the existing ones or around, depending on size.
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Old 07-09-2018
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I only have one spring, as Kevin & Joe pointed out to me when inspecting my rig, & it's too long; a PO forced it on the attachment point an inch or so from the end. Do the springs come in different lengths & tensions, & if so, what should I be looking for?
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Old 07-09-2018
markusfmeyer markusfmeyer is offline
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The spring should fit snug, not super tight but not loose. I took springs out of the package and used ones that were just a little shorter than the distance I needed to attach them to, this way they were snug with just a little tension so they can't easily pop off. Then there is the test that it wasn't too strong which I described in my original post.
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