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Old 11-14-2020, 09:26 PM   #1
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Wiper Stroke Adjustment Tips

I need help in figuring out how to adjust where my wiper arms stop on my Ventana 3717. Right now, when they finish a stroke, the arm comes back up a little bit. This is causing a set in the blade which makes the wiper work great in the up stroke but jump and skip on the way back down (which is the more important stroke).

I've tried to adjust the extension nuts but they only adjust where on the windshield the blade stops. They don't affect the 'back up' aspect which is causing my problem. Looking 'under the hood', it seems I need to adjust the stroke arm that is connected to the gear drive off the wiper motor. However, when I loosened the nut that holds this on, it doesn't budge. I believe this is because the shaft is splined. Therefore, I would need to pull the whole arm off the shaft, rotate it a bit, and then re-insert onto shaft. This doesn't seem possible given all the connecting arms as well as the front facia of my coach being in the way.

Anyone run into this or have any ideas on how to fix my issue? What I do now is pull the blade off the window when at a campsite or in storage but that is cumbersome or I simply forget to do it.

Thanks!
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Old 11-15-2020, 08:44 AM   #2
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You may be able to pull the entire wiper arm loose from the post and reset it That arm is usually on a splined shaft. I don't know how the coach body manufacturer installed these wipers, but many have a hinged or pop off cover that hides the attaching nut. Loosen and remove the nut, pull the arm off - and this might take some physical effort to do - then reset at a different angle or spline setting. No guarantee, but I have done this on multiple vehicles from small cars to fairly large trucks to set the wipers at better operating positions
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Old 11-15-2020, 08:55 AM   #3
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Where the motor, and arms, stop ( park position ) is a function of the park switch inside the wiper motor.

You could re-index the linkage on the motor but then the wipers may travel down further. Then then both arms may need to be moved up.

Step one is to get them stopping on the down swing.
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Old 11-15-2020, 09:14 AM   #4
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The "set" as you say, to me is not important. Wiper blades all do that.
I use a spacer to get the blades off the windshield when parked, not driving. Available for under $10.
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Old 11-15-2020, 09:26 AM   #5
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Quote:
Originally Posted by IC2 View Post
You may be able to pull the entire wiper arm loose from the post and reset it That arm is usually on a splined shaft. I don't know how the coach body manufacturer installed these wipers, but many have a hinged or pop off cover that hides the attaching nut. Loosen and remove the nut, pull the arm off - and this might take some physical effort to do - then reset at a different angle or spline setting. No guarantee, but I have done this on multiple vehicles from small cars to fairly large trucks to set the wipers at better operating positions
Do not pull your wiper arm off the shaft!!! The wiper arm barrel comes smooth. When you torque the wiper on to the shaft the spline cuts groves into the wiper arm. If you remove it, you will not always get it into the same groves and it will strip out. Ours stripped out after having the windshield replaced and we had to buy new arms.
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Old 11-15-2020, 02:00 PM   #6
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Do not pull your wiper arm off the shaft!!! The wiper arm barrel comes smooth. When you torque the wiper on to the shaft the spline cuts groves into the wiper arm. If you remove it, you will not always get it into the same groves and it will strip out. Ours stripped out after having the windshield replaced and we had to buy new arms.

Wrong! If yours stripped out, it was due to NOT tightening correctly.
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Old 11-15-2020, 02:17 PM   #7
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Wrong! If yours stripped out, it was due to NOT tightening correctly.
I don't agree. Here is one of many posts on IRV2 explaining the problem. I had the same thing happen to me when the dealer removed the arms for changing the windshield. I installed the new wiper arms myself, so I know of the smooth barrel on the arm and the proper torquing procedure.

https://www.irv2.com/forums/f103/if-...ad-348492.html
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Old 11-18-2020, 03:27 PM   #8
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Thanks for the info all,

I respect the discussion about pulling the arm off the shaft. I don't have the space to do this anyway so probably an issue I will not run into.

Pulling a wiper arm off won't solve my issue as this is the same as adjusting where the arm stops. I'm still left with the arm 'backing up' a bit when it stops.

For my latest trip, I remove the blade and flipped it over. That helped a lot. With this and the suggestion to put a spacer to lift the blade off the window when parked or stored, I think I've done the best I can. The engineer in me wants to fix the root of the problem - guess I'll have to let this one go....
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Old 11-18-2020, 03:32 PM   #9
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You could always disable the park circuit and switch off the wipers at the point you want them to.
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Old 11-18-2020, 07:31 PM   #10
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Just bend the wiper arms slightly. It will take some trial and error to get them just right, but after corrected, the blade will be angled down as the wiper arm moves up, then as the wiper arm starts coming down, the blade will flip over and be angled up as the wiper arm comes down.
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