I spent way too much money for a couple sets of air wiper motor rebuild kits. The rebuild was easier than I expected and both sides turned out really needing the rebuild.
So everything has new o-rings, lots of lube, and new valves. I installed them both and neither of them even budge. No movement at all.
What can cause this?
Linkage binding or no air supply
I certainly have air supply and the unit is hanging out of the bus, so linkage shouldn't be a problem.
The instructions say something about applying air to both the inlet and the park ports. I'll have to cobble something up to do that. I don't just have multiple 100psi air supplies with the right ends laying around the bus. Maybe I can go to NAPA and get some air brake line, some fittings and extend the left to the right.
It seems foolish trial... but I'll keep my fingers crossed.
Yep they need 2 air supplies as they push and pull
QuoteYep they need 2 air supplies as they push and pull
Actually, I don't think that's really true. There are two air line connections. When you turn the wipers off, the switch applies pressure to the park side. But while running, the internal air valve, in the wiper motor, takes the single air line and switches air from side to side. So the second side only gets air when parking.
However, there isn't enough pressure on the park switch in my test mode to actually release the park.... somehow ? ? ?
If buying a small pile of fittings and some air line doesn't do the trick, I'll be at a total loss.
I hope to find somebody on this forum to tell me they had the same problem and they did some trick and POOFF! - everything is fixed. ;D Lots of things on these buses like this
It needs to supply air and exhaust the air through the muffler where did buy the kits if you bought from Rome Truck Parts call them,they are not that complicated to make work,plus you not posting the manufacture name of the wipers makes it hard to help since there are a 1/2 dozen different manufactures and models of air wipers
good luck
Believe me,I don't mean to sound like a smart a-- but if all you did was rebuild them ,shouldn't they go back just like they came out??I mean if they were working before and you only removed them and did a rebuild all the parts should be there without you having to build air lines and all that!!
If it ain't broke......:)
But seriously, you may have reversed the connections, or they may neex a little lub and a little shove. I know I have "fixed"/jambed ones with silicone lube and a shove (helping the arm move).
Rebuilt Air Wiper Motor - Now it doesn't work New in Bus Topics ( click here for quick start! )
Man-man, been there a time or two. My wiper in front of the driver just decided to flop out while I was using it ... blam! Disappeared down around the front bumper, man that sucks.
Thank God for truck-stops. hefty waitresses, black coffee and Apple pie. There isn't anywhere I have to be in a hurry.
That is nice.
BCO
Dave if you used the lube that came with them ok but if it was like a lube grease its too thick. I used to put some regular air oil in the hoses before hooking them back up and then they worked. Just a few drops.
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Quote from: Dave5Cs on July 08, 2015, 07:04:20 PM
Dave if you used the lube that came with them ok but if it was like a lube grease its too thick. I used to put some regular air oil in the hoses before hooking them back up and then they worked. Just a few drops.
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To keep my wiper motors happy I use these cheapo-but-surprisingly-good inline lubricators at each motor: http://www.harborfreight.com/38-in-oil-fog-lubricator-68233.html (http://www.harborfreight.com/38-in-oil-fog-lubricator-68233.html) Actually mine are the 1/4" ones, but Harbor Fright seems to have discontinued that size. I use air tool oil in them, and the wipers definitely are smoother and quieter now that they're constantly lubricated. Well worth it if you're keeping the air wipers.
John
That's a good idea;make sure to route the exhaust tubing to the outside of coach if it isn't already to avoid breathing the mist.
If you had both motors apart at the same time or flipped upside down, you may have gotten the inlet on the side if the casting port that is not drilled out. In other words, left and right.
If he tighten the adjustment screw inside the muffler all the way they are not going to work either
Dave, what's the latest? I owe you a phone call too!
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Really frustrated...
No, their not working yet. I had to give up on them for some weekend trips. Fortunately I didn't encounter rain, so it hasn't been an issue.
Today I spent $26 for some air line and fittings to bring air to the park port. Now I have full pressure on both ports and still nothing. I checked the exhaust screw. No idea how to set it, but I backed it out a fair bit.
Nothing binding, I'm holding the motor in my hand. Air to either or both ports... nothing budges.
Shouldn't I be able to turn the wiper shaft with pliers? I can't budge it.
Same problem with both motors.
should I put air pressure to the exhaust port instead of the park port?
Attached are the picture I sent Luke (to identify) before I rebuilt them. Somebody asked brand...
(https://photos-4.dropbox.com/t/2/AACW-0Mm1PeDdtD69OFyNgxdglBxgvGdCwxezS5CSXnXsA/12/31679284/jpeg/32x32/1/_/1/2/File%20Jul%2025%2C%203%2016%2014%20PM.jpeg/EN3U_hcYlIQRIAIoAg/_NDBoBpYgS8wbJHUQ4QqzpXZqo-s1bWyMLhUVcy499o?size=1024x768&size_mode=2)
(https://photos-6.dropbox.com/t/2/AABZWLi9lXxzkHcukbGz2QFZ13RT6lAB4wnckHkm5kUyYA/12/31679284/jpeg/32x32/1/_/1/2/File%20Jul%2025%2C%203%2018%2057%20PM.jpeg/EN3U_hcYlYQRIAIoAg/kYJ_DkqXT5091713CaWCfgZKoWN3Z66X4mBSZcDVGlE?size=1024x768&size_mode=2)
(https://photos-2.dropbox.com/t/2/AACQNfgMFcCs2nMlBcBH8KdVCKpg5YyWKYfaBST3oTc50g/12/31679284/jpeg/32x32/1/_/1/2/File%20Jul%2025%2C%203%2020%2030%20PM.jpeg/EN3U_hcYloQRIAIoAg/EwrdDXj3-zHJZT5KwtNkAm0BjbM7IlSe3BUX65M-iTQ?size=1024x768&size_mode=2)
I don't know what brand you have but it sound like the gear and rack are out of sync
I always remember being able to use the handle to make one swipe....easily when the air was shut off...
It's been over 8 years since I rebuilt (changed the O-rings) on my wipers, so I do not remember much about it. Since you are having the issue with both motors, it would seem that you have made the same mistake in assembling both. I remember that the units do not work if they do not exhaust. That could be one thing to look at. Also, I do not know if direct air should be applied to the run and park ports at the same time. Have you tried running it through the switch? I believe mine are Sprague. Haldex seems to be another manufacturer. Maybe the schematic is available with them.
It would definitely seem that you should be able to move the shaft manually if there is no air pressure being applied. Sorry I can't be more helpful. Mine kept me frustrated for a bit too.
Well, it's time for my to hang my head low in shame and embarrassment. I would just prefer to delete this post and pretend it didn't happen. But it seems proper to leave this post - and realize that I may not be the only foolish person on this board.
I simply had the linkage reversed, so it was pinned against it's own frame. I had actually marked the position with a pen, so I don't know why it didn't work, but it seems I probably marked the position in one full swing, but the actual parked position was total opposite.
One more question, It was mentioned before about the adjustment screw for the exhaust. What is that for and how I know how much to adjust?
Thanks for putting up with my foolishness
Dave
You adjust the flop and torque with the exhaust screw Dave to suit you,it make take you several tries to get it where you want it they can be adjusted to work smooth
Ok, another problem... Installed the driver side first and I get only half sweep...
Be sure to have the motors in the park position before installing the arms and that should fix that problem
Right now I'm testing by holding the wipers away from the glass. The passenger side seems fine.
The driver side goes to park easily, but only swings half swing, I hear a clunk, then it returns to park.
Maybe I need to open it back up and find what it's clunking against.
I HATE mechanical work!
Again I don't know what brand you have but most have a supply inlet and a park air inlet check and be sure the lines are not crossed
Below is a video of the problem...
https://www.youtube.com/watch?v=WidtOIwaPag (https://www.youtube.com/watch?v=WidtOIwaPag)
Ok. In Dave's defense, (Tikvah), I very carefully and slowly (this project took most of my day today) took photos of the assembly, and disassembled it. Replaced plungers/o-rings, and air manifold. Put it all back together...and it was jammed up. Same problem he had. The problem is that you can't easily mark the gear/track locations to each other so when you put it back together it's easy to guess and mis-align them. That being said, I'm going to call Dave here in a little bit because I think he posted that he has the gear in the dead center of the track. This isn't correct, I had to pull everything apart all over again and using the photos I took earlier, positioned the lever arms in the "parked" position, and then moved the track to place the gear at one complete side of the housing. This proved to be the issue and I have a wiper that once was completely dead, and now lives! And really operates smoothly...wow...no jerky movements, just smooth and I like that I can slow it down or speed it up with the knob. I'm a believer in air wipers again. Mine are dated 1982, so they are the same age as me...33 years out of a wiper motor ain't too bad in my opinion. Here's some pics of my mess and a video of success!
VIDEO OF SUCCESS: https://www.youtube.com/watch?v=u2hftXtkUak (https://www.youtube.com/watch?v=u2hftXtkUak)
(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fimages.tapatalk-cdn.com%2F15%2F09%2F01%2Ffc6677018e047c2f84703f1a12fc7606.jpg&hash=740e4f82b72e0f5ab57203dc28666f07d361e5e4)(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fimages.tapatalk-cdn.com%2F15%2F09%2F01%2Fc2385fc98d9cf7afb6152c86b0f4f66b.jpg&hash=17b1b7b7681ccce6764360aaadbf69f62bbd46a2)(https://busconversionmagazine.com/forum/proxy.php?request=http%3A%2F%2Fimages.tapatalk-cdn.com%2F15%2F09%2F01%2Fce68d49f27b8c8cb529ac5e679e94cb9.jpg&hash=e65ad4c916c741d9e6d610d99b6e1a8d8dd0dc91)
They have timing marks get off 1 tooth and they can be a night mare
I believe it. This whole rebuild was kind of a pain. I hope this one lasts 33 years too cause I'm not doing this again :-/ thankfully our new bus has brand spankin new air/electric wipers with touchpad control. No drama there. Anyway, glad it's over
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My solution to bad air wiper motors was to convert to electric. I have individual electric motors with electronic motor control that keeps the two sides working in unison. With the adjustable delay, low and high speed, I am extremely pleased with the performance. I will be converting my KW to electric also. Good Luck, TomC
PROBLEM FIXED!
The hex-shaft inside the drive gear was off. When rebuilding and washing all the parts I never dreamed the 1/6 turn of that shaft could be an issue. Looking at it now it's obvious.
This is why I'll never rebuild a DD....or any other engine. Too many SIMPLE potential problems that can't be known without experience.
;D