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I found my air leak


Wiley
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There is no air line off of that . Its an exhaust for the wiper motor. If it gets plugged at all the wipers won't work. Because its leaking air , It sounds like it is ok .  Your problem is somewhere else. 

The first thing I would try is taking the air lines off the other side and put some air tool oil in them . Sometimes that's enough to get them going . Otherwise you may need a rebuild kit. I don't know much about that , but its been talked about on here . The air tool oil or penetrating oil has always worked for me . 

Keith 

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Just thinking about it ..... Do the wipers work ? If everything works ok and just leaks out the exhaust , I would say the are not going in the park position . Then I would be looking at the control valve .   

Keith 

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The wipers come on sporadically for no reason and I was told that parking break doesn’t work. When you shut off the truck you can hear air leaking and I tracked it down to hear. I’m confused.

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When you shut the wipers off ,you put them into park position . If they are coming on sporadicly, I would lean toward the control valve .  

Its on the right side of the pic . 

I think ? its part # would be 7623-7547070 but not sure . Hopefully Watts can help you or a local to you Mack dealer 

 

 

 

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Edited by 85snowdog
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Keith 

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Before you buy anything or tear everything apart , take the supply line off the control valve and put some air tool oil in it . Then turn wipers on and off a lot , keep putting them in park , if truck has been sitting  for a while , might be enough to solve your problem . 

In case you didn't know , park position is important . If your wiper control is pull out and turn to the right to increase speed , the park is... push in all the way till wipers go back to the bottom . If you turn the wiper control to the right to turn it on and increase speed , turn to the left all the way till wipers go back to the bottom . When they are in park, no air should go to the motor and therefore no air leaking out the exhaust . 

Just my thought anyway 

 

 

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Keith 

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12 hours ago, 85snowdog said:

Before you buy anything or tear everything apart , take the supply line off the control valve and put some air tool oil in it . Then turn wipers on and off a lot , keep putting them in park , if truck has been sitting  for a while , might be enough to solve your problem . 

In case you didn't know , park position is important . If your wiper control is pull out and turn to the right to increase speed , the park is... push in all the way till wipers go back to the bottom . If you turn the wiper control to the right to turn it on and increase speed , turn to the left all the way till wipers go back to the bottom . When they are in park, no air should go to the motor and therefore no air leaking out the exhaust . 

Just my thought anyway 

 

 

Thank you very much sir. I will do this.

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