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Author Topic: Windshield motor pump for GM 4104  (Read 2050 times)
harleyman_1000
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« on: August 23, 2013, 07:20:50 PM »

 Does anyone have a windshield motor pump for a GM 4104?
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Scott 
St.Louis Missouri

1958 GM 4104 Extended 2 feet, with a 6v92 and 5 speed automatic

http://s783.photobucket.com/user/harleyman_1000/library/Gm4104%20bus?sort=3&page=1
gus
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« Reply #1 on: August 23, 2013, 07:29:42 PM »

There is no pump, it runs off the air system.
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PD4107-152
PD4104-1274
Ash Flat, AR
harleyman_1000
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« Reply #2 on: August 23, 2013, 07:47:08 PM »

There is no pump, it runs off the air system.
Ok, what is it called? A regulator? My drivers side one doesn't work the air inlet cracked and broke
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Scott 
St.Louis Missouri

1958 GM 4104 Extended 2 feet, with a 6v92 and 5 speed automatic

http://s783.photobucket.com/user/harleyman_1000/library/Gm4104%20bus?sort=3&page=1
bevans6
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« Reply #3 on: August 24, 2013, 02:52:21 AM »

Do you mean the bit that flaps the wiper back and forth?  It's the windshield wiper motor.  You could also mean the windshield wiper control, on the dash, that regulates the air flow to the motor.  If you mean a pump, you could mean the air pump thingy that is inside the washer bottle that holds the fluid.  It has an air regulator control on the dash too.  So you could mean about 6 different things...  They all run off air pressure.

Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
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harleyman_1000
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« Reply #4 on: August 24, 2013, 08:34:27 AM »

 I mean  "the bit that flaps the wiper back and forth?  It's the windshield wiper motor."    Embarrassed  My bus doesn't have windshield fluid shooter outter thingy....lol
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Scott 
St.Louis Missouri

1958 GM 4104 Extended 2 feet, with a 6v92 and 5 speed automatic

http://s783.photobucket.com/user/harleyman_1000/library/Gm4104%20bus?sort=3&page=1
luvrbus
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« Reply #5 on: August 24, 2013, 08:37:50 AM »

If you just broke the air line connection you can buy those without buying the complete motor fwiw
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treeplanter
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« Reply #6 on: August 24, 2013, 08:47:03 AM »

Luke at U S Coach has many of the parts you will need to fix your bus.
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Timothy
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« Reply #7 on: August 24, 2013, 08:49:26 AM »

There were two different motors and controls used on the 4104, Trico and Sprague.  I think the Sprague was for the pantograph wipers and Trico for the standard, but I'm not sure.
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treeplanter
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the grey ghost,1971 GMC 5305A




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« Reply #8 on: August 24, 2013, 08:55:18 AM »

Mine are Air Push rebuilt them and still don't work, next replace the control valve$.
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Timothy
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« Reply #9 on: August 24, 2013, 09:01:04 AM »

Air Push is a trade name for Sprague same motor
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gus
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« Reply #10 on: August 24, 2013, 11:12:56 AM »

Make double sure it isn't the switch/regulator.

Those things failing have caused a lot of motors to be replaced!

I repaired one but don't remember how I did it, just that it wasn't very easy.

Next time I'll just substitute a plain ole air valve and be done with it. The plumbing is a real PIA and has oddball fittings.
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PD4107-152
PD4104-1274
Ash Flat, AR
harleyman_1000
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« Reply #11 on: August 24, 2013, 04:01:36 PM »

 Mine says "Air Push" on it. It wasn't the air line that broke, but the plate with the threads in it that the line screws into that broke. Im trying to upload pictures from my phone that shows it, but having trouble.
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Scott 
St.Louis Missouri

1958 GM 4104 Extended 2 feet, with a 6v92 and 5 speed automatic

http://s783.photobucket.com/user/harleyman_1000/library/Gm4104%20bus?sort=3&page=1
harleyman_1000
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« Reply #12 on: August 24, 2013, 04:29:41 PM »

https://www.facebook.com/photo.php?fbid=621177154571284&set=a.621177134571286.1073741827.100000370146510&type=3&theater
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Scott 
St.Louis Missouri

1958 GM 4104 Extended 2 feet, with a 6v92 and 5 speed automatic

http://s783.photobucket.com/user/harleyman_1000/library/Gm4104%20bus?sort=3&page=1
harleyman_1000
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« Reply #13 on: August 24, 2013, 04:32:36 PM »

 That link is to my windshield motor picture. I couldn't get it to upload here? It is a blurry picture, but it you look closely to a copper line just to the left of the yellow line. you will see what broke.
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Scott 
St.Louis Missouri

1958 GM 4104 Extended 2 feet, with a 6v92 and 5 speed automatic

http://s783.photobucket.com/user/harleyman_1000/library/Gm4104%20bus?sort=3&page=1
tekebird
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« Reply #14 on: August 24, 2013, 07:21:45 PM »

did the fitting on the motor break?
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treeplanter
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« Reply #15 on: August 24, 2013, 10:01:03 PM »

looks like the fitting broke off the motor hard to tell from photo. You need a manual on your bus (http://www.coachinfo.com/AllAboutBuses/GMC_Info.html or ebay or search the web),so you wont pull out all your hair trying to fix $tuff.You can also replace them with electric ones for a small fortune or look in wrecking yards to fabricate one out of a truck.
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Timothy
harleyman_1000
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« Reply #16 on: August 24, 2013, 10:12:46 PM »

 I will try and get better pictures tomorrow
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Scott 
St.Louis Missouri

1958 GM 4104 Extended 2 feet, with a 6v92 and 5 speed automatic

http://s783.photobucket.com/user/harleyman_1000/library/Gm4104%20bus?sort=3&page=1
luvrbus
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« Reply #17 on: August 25, 2013, 06:37:36 AM »

There is nothing wrong with air wipers they have a torque and speed adjustment setting screw once you figure the adjustments out and make sure the pressure regulator is set right they do a good job like on some Eagle buses they can even have intermittent delay speed
« Last Edit: August 25, 2013, 06:42:01 AM by luvrbus » Logged

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harleyman_1000
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« Reply #18 on: September 01, 2013, 06:43:37 PM »

 Got a motor in the mail yesterday from someone on the other board and he said all he wants is the postage paid. You guys are great!!!!
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Scott 
St.Louis Missouri

1958 GM 4104 Extended 2 feet, with a 6v92 and 5 speed automatic

http://s783.photobucket.com/user/harleyman_1000/library/Gm4104%20bus?sort=3&page=1
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