Rebuilt Air Wiper Motor - Now it doesn't work

Tikvah · July 06, 2015, 05:42:21 AM

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?

luvrbus · July 06, 2015, 06:33:02 AM

Linkage binding or no air supply

Tikvah · July 06, 2015, 06:54:39 AM

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.

luvrbus · July 06, 2015, 06:59:05 AM

Yep they need 2 air supplies as they push and pull

Tikvah · July 06, 2015, 07:05:41 AM

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.

Lots of things on these buses like this

luvrbus · July 06, 2015, 07:24:15 AM

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

bigred · July 06, 2015, 03:51:00 PM

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!!

zubzub · July 06, 2015, 06:33:41 PM

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).

boxcarOkie · July 07, 2015, 03:19:31 AM

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

Dave5Cs · 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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Iceni John · July 08, 2015, 08:44:19 PM

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.

Sent from my SPH-L710 using Tapatalk

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 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

chessie4905 · July 09, 2015, 03:35:21 AM

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.

luvrbus · July 09, 2015, 08:28:08 AM

If he tighten the adjustment screw inside the muffler all the way they are not going to work either

Scott & Heather · July 09, 2015, 06:31:10 PM

Dave, what's the latest? I owe you a phone call too!

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Tikvah · July 25, 2015, 12:01:52 PM

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...