| Author | Message | ||
| Glenn Williams (Glenn)
Registered Member Username: Glenn Post Number: 10 Registered: 6-2006 Posted From: 207.179.92.18 Rating: N/A |
Been searching through the Board and can't find the thread about the air assist clutch on one of the GMC's. I think it was on a 4106 or 4107. The thread even had a picture of the air valve that is activated by pressure on the clutch pedal. I'd like to get part numbers for that valve assembly and info on how to install one in my 4905. | ||
| David Hartley (Drdave)
Registered Member Username: Drdave Post Number: 717 Registered: 5-2005 Posted From: 67.78.176.54 Rating: N/A |
The air assist is usually a single unit and mounted in the linkage in the front drivers access panel under the floor. At least it was on my PD4501. The actuator and valve unit are all-in-one. I know that probably isn't much help, But ( Kyle4501) may want to sell that actuator assembly if he doesn't need it on the scenicruiser #598 Dave.... | ||
| Bob greenwood (Bob_greenwood)
Registered Member Username: Bob_greenwood Post Number: 434 Registered: 7-2006 Posted From: 64.136.49.228 Rating: N/A |
seems like pete in florida had the parts off a RTS..... I might be wrong | ||
| Glenn Williams (Glenn)
Registered Member Username: Glenn Post Number: 11 Registered: 6-2006 Posted From: 207.179.92.18 Rating: N/A |
Thanks guys! The unit I saw pictured must be very similar if not the same as the one's in the 'cruisers. I do remember that it is installed under the drivers area. Would it just take air from the tank that is in there as well, or off the supply side of the air horn? | ||
| FAST FRED (Fast_fred)
Registered Member Username: Fast_fred Post Number: 54 Registered: 10-2006 Posted From: 4.235.206.249 Rating: N/A |
The 4106 used a "Mousetrap" a simple overcenter spring setup. Takes about 15 min to install, nothing to go wrong ,and reduces peadle pressure 80 or 90%. FAST FRED | ||
| Glenn Williams (Glenn)
Registered Member Username: Glenn Post Number: 12 Registered: 6-2006 Posted From: 207.179.92.18 Rating: N/A |
Fred I'm not familiar with the "mousetrap". Is it something like an automotive dual spring throttle return? I am guessing it doesn't use any air, so nothing can go wrong? The pedal pressure on my 4905 is SIGNIFICANT! I'm a short person (5ft) so I don't get a lot of leverage on the clutch once it's down.  | ||
| Bob greenwood (Bob_greenwood)
Registered Member Username: Bob_greenwood Post Number: 436 Registered: 7-2006 Posted From: 64.136.49.228 Rating: N/A |
Glen... Look at a early Harley 74...my '59 had a mousetrap like he is talking about Go to a Harley shop & tell them you want to see a mousetrap & how it works I do believe it will take MUCH more than 15 minutes tho Lots of times, it's the cable that goes from front to back,gets all hung on dirty ,coagulated grease inside the houseing (Message edited by bob greenwood on December 07, 2006) (Message edited by bob greenwood on December 07, 2006) | ||
| captain ron (Captain_ron)
Registered Member Username: Captain_ron Post Number: 646 Registered: 1-2005 Posted From: 66.174.79.229 Rating: N/A |
Unfortunately you probably won't find a mouse trap at todays Harley dealerships as that is an obsolete part. most of the young yeahoo's that work there would probably send you to Walmart for a mouse trap. I know from my own personal experience with Glens bus he needs help with that clutch, just wait till you drive it through Chicago traffic. Your next post will be for an automatic transmission  | ||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1127 Registered: 12-2000 Posted From: 67.181.163.170 Rating: N/A |
Bob - GMCs do not use a cable for the clutch. Glenn - Here's a pic of the GMC Mousetrap, as installed on my 4106:  Yes, this moustrap would work on your 4905. Check with Luke at US Coach, JD at C&J or Dean's Coach for availability of a used one. Also, be sure your clutch is adjusted properly. You'll need the shop manual, as the procedure calls for starting at the front of the bus and working your way back. When adjusted properly, the clutch can be as light as an old VW Beetle's. FWIW & HTH, | ||
| Glenn Williams (Glenn)
Registered Member Username: Glenn Post Number: 13 Registered: 6-2006 Posted From: 207.179.92.18 Rating: N/A |
RJ - Could you e-mail me a bigger version of that photo? Glenn@threemenandatenor.com. Fortunatley, the good Captain included the manuals with the bus so I'll start with a full linkage adjustment. I like the mousetrap setup. Thanks! Ron - Having just been throught Chicago twice in the last couple of weeks --OUCH! I'd need knee and hip replacement surgery! | ||
| Austin Davis (Zimtok)
Registered Member Username: Zimtok Post Number: 47 Registered: 9-2006 Posted From: 216.37.73.226 Rating: N/A |
I have a clutch air assist on my 4104 and it has a air cylinder mounted on the transmission that is connected directly to the clutch rods/throwout bearing fork. I also think there is something mounted in the compartment under the driver. . | ||
| Bob greenwood (Bob_greenwood)
Registered Member Username: Bob_greenwood Post Number: 437 Registered: 7-2006 Posted From: 64.136.49.228 Rating: N/A |
Glenn.. it's the same theory as a motorcycle kickstand,it has a spring & it breaks over center at one point | ||
| john w. roan (Chessie4905)
Registered Member Username: Chessie4905 Post Number: 352 Registered: 10-2003 Posted From: 71.58.126.56 Rating: N/A |
My 4104 has the air assist clutch...everything mounts in the engine compartment. I beleive that HB industries sells one like mine, although expensive now a days. Mine has been on for about 20 years with never a problem. | ||
| Craig (Ceieio)
Registered Member Username: Ceieio Post Number: 279 Registered: 12-2004 Posted From: 207.101.213.58 Rating: N/A |
Hi Glenn - sorry I am late to the party. This is a link to the HB Industries (HB == Honest Bob) air clutch. As mentioned, expensive, but perhaps worth it to you to get the most enjoyment out of your bus. I drove an eagle with an air assist clutch and that was very nice, no effort at all. http://www.hbindustries.us/air.htm Best of luck, Craig - MC7 Oregon | ||
| Douglas Tappan (Dougthebonifiedbusnut)
Registered Member Username: Dougthebonifiedbusnut Post Number: 8 Registered: 10-2004 Posted From: 24.62.105.169 Rating: N/A |
Hey Guys Need to know more about these "Mouse Traps" I'd love to put one on my Crown. Any info greatly appreciated. | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 244 Registered: 11-2005 Posted From: 63.97.117.33 Rating: N/A |
I would like to get my hands on a mousetrap for my 4104 also but they are hard to find. HB's is great but it is $750 without installation!! I rebuilt my 4104 clutch and shift linkages-forks, pins and bellcrank arms. They were all worn badly, some almost completely through. After the rebuild and very careful adjustment my clutch took about 40% of the effort as before. The whole idea of the adjustment is to get all the lever arms as close as possible to 90 degrees to the rods for max mechanical advantage. | ||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1128 Registered: 12-2000 Posted From: 67.181.163.170 Rating: N/A |
Glenn - Check your private mailbox for pics. Doug T - No mousetraps available for Crowns, AFAIK. I've only seen them on V-drive GMCs. Gus is right about making sure all the linkage is in top-notch condition and properly adjusted. FWIW & HTH. . . | ||
| Glenn Williams (Glenn)
Registered Member Username: Glenn Post Number: 17 Registered: 6-2006 Posted From: 207.179.92.18 Rating: N/A |
RJ- Just checked the clutch arm on my 4905 and it does not have the attachement point for the spring on the mousetrap. Thanks! | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 245 Registered: 11-2005 Posted From: 63.97.117.14 Rating: N/A |
Glenn, I remember seeing a stock mousetrap setup for a TD5103, or something like that, that had a wet clutch. It should fit any 8V71 with a little improvising. I would put one on my 671 if I could find one. A 671 would take a lot more modifying but it would be worth it. There are actually two air boost systems that I know of. The one by HB at the back and another one underneath the driver's floorboard. | ||
| Tom Caffrey (Pvcces)
Registered Member Username: Pvcces Post Number: 1028 Registered: 5-2001 Posted From: 65.74.69.234 Rating: N/A |
Gus, I seem to remember that there was a mousetrap that was built for a 4104 at Ted Campbell's Coach Maintenance in Williams, CA. I saw it when we were getting some work done in the middle of last month. Google the business name. Tom Caffrey PD4106-2576 Suncatcher Ketchikan, Alaska | ||
| Gus Causbie (Gusc)
Registered Member Username: Gusc Post Number: 276 Registered: 11-2005 Posted From: 63.97.117.13 Rating: N/A |
Tom, Thanks, I just sent him an email. |