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Old 03-13-2018, 03:19 PM   #1
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Join Date: Dec 2017
Location: Possum Kingdom Lake Tx.
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step cover!!

Having some problems with my step cover. 2001 dynasty. When air preassures up the step will finally extend, but then I can't get it back in until air preassure is bled off. any quick checks or fixes. How do you get to the darn thing. Thanks.

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Old 03-13-2018, 03:29 PM   #2
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Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 33,715
Hi Jim! Welcome to IRV2! We're sure glad you joined the gang!

I've never had a problem with the step cover so can't help with that one! Keep her between the ditches!

Good luck, happy trails, and God bless!

Joe & Annette

2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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Old 03-13-2018, 05:20 PM   #3
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Hi Lonestarpyro; Not an unusual problem. Had this problem on my previous 2000 Windsor and my current 2001 Windsor. The problem is in the Mac Valve located on the firewall in the generator compartment. Dirt can get into the valve and the step will deploy but not retract. If you go into the gen compartment, I am almost sure you will here air escaping from the blue Mac Valve. There are 3 air lines to the valve. One is supply and the other 2 are for extend and retract air pressure to the piston that moves the step in and out. This is how I clean dirt or whatever is stuck in the valve. On the side of the Mac Valve there are 2 small adjustment screws that control the volume of air through the valve to the piston. Back those screws all the way out as far as they will go. I have never removed them from the valve body. Have someone by the step as you operate the switch from extend to retract. The step will rocket out at high speed so someone needs to be there to slow it down so it does not hit the stop real hard. You will air escaping from the valve as you are doing the in and out of the step switch. Try this about 5 to 8 times. Now run those adjustment screws in until they seat. Now run the screws out about 2 revolutions. The step cover should go in and out at a slow speed. Keep adjusting screws out for faster travel speed of the step cover. This always works for me. If the above procedure does not work for you, there could be something big stuck in the Mac Valve. Hope this info gets the step back to normal operation. Good luck! Have never done this but from what I understand, you can disassemble the valve and flush it out with WD-40.
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Old 03-13-2018, 08:13 PM   #4
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Lubricate the cylinder

Although the problem is frequently the MAC valve, these air cylinders were not designed to run without lubrication. Remove the lines from the MAC valve that go to the ends of the cylinder. Put a few drops of light oil in the lines and work the step cover by hand back and forth to get the oil into the cylinder. This sometimes cures the problem, and even when it does not, it lubricates the cylinder and you will find its action much smoother and more dependable
Van W 2000 Dynasty 36, pulling one Harley
Southeastern NC
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Old 03-13-2018, 09:44 PM   #5
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Join Date: Mar 2012
Posts: 1,806
Sounds like a blocked exhaust port on the Mac valve or a blocked line. It has two screws on it I think. Mark the starting point and adjust them counting how many half turns you do. It should increase and decrease the open and close speed. If you need a new cylinder itís only about $70. A Mac valve is around $35
2001 Monaco Dynasty tag axle
2006 Jeep Wrangler
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