Step won’t shut till 10 minutes down the road

Topic: Step won’t shut till 10 minutes down the road (Read 2008 times) previous topic - next topic

Re: Step won’t shut till 10 minutes down the road

Reply #25 – April 07, 2020, 02:48:04 pm

Quote from: Tommy D – April 07, 2020, 02:00:01 pm

What about that kind of relief valve? What is that style relief valve called? In case I break one like I already did😳

Is this a suitable replacement
Quietaire Series, speed control muffler, 1/4" NPT male port, 40 µm sintered...

Or is there a source for the same one?

Are the threads still in the valve?

Re: Step won’t shut till 10 minutes down the road

Reply #26 – April 07, 2020, 04:38:03 pm

Quote from: craneman – April 07, 2020, 02:48:04 pm

Are the threads still in the valve?

No I was able to get it out and have ordered a new valve and muffler from see photo. Cleaned all openings and fittings and sprayed in silicone grease to lube but had no luck, could only get solenoid to actuate to open step not close step.

Was a great learning experience. I've been a little apprehensive about fooling with anything to do with the air system but it wasn't hard with all the help from you guys! Thanks a bunch! Hopefully I'll get the new valve installed when I get it and working properly.

Re: Step won’t shut till 10 minutes down the road

Reply #27 – April 07, 2020, 08:50:27 pm

I had a similar problem with my step, but my step would not come out. Replaced the muffler and selonoid
and still did not work. It ended up being the clipboard cylinder. The cylinder that moves the step in and out.
Replaced it and everything worked great. Yours maybe different.

Re: Step won’t shut till 10 minutes down the road

Reply #28 – April 07, 2020, 08:52:44 pm

Quote from: Big Al – April 07, 2020, 08:50:27 pm

I had a similar problem with my step, but my step would not come out. Replaced the muffler and selonoid
and still did not work. It ended up being the clipboard cylinder. The cylinder that moves the step in and out.
Replaced it and everything worked great. Yours maybe different.

Also keep in mind the air cylinder can leak in the open or closed positions. So check them periodically

Re: Step won’t shut till 10 minutes down the road

Reply #29 – April 07, 2020, 09:03:02 pm

Quote from: Big Al – April 07, 2020, 08:50:27 pm

I had a similar problem with my step, but my step would not come out. Replaced the muffler and selonoid
and still did not work. It ended up being the clipboard cylinder. The cylinder that moves the step in and out.
Replaced it and everything worked great. Yours maybe different.

Changed the air line to the cylinder and it worked fine to close the step. So think it is the solenoid.

Re: Step won’t shut till 10 minutes down the road

Reply #30 – April 09, 2020, 08:00:02 pm

Need some problem solving help.

Replaced valve (all wires and ports hooked to same # as original valve)and it is acting just like the one I replaced.
Door open air out of bottom port
Door closed air out of bottom port
Solenoid is actuating when door is opened or closed
If I hook up the cylinder to bottom port it opens or closes the step fine when I switch the lines
Took both green wires off of magnetic switch and tested by touching those together and put meter on this wire and ground and got 12v

What next?

Re: Step won’t shut till 10 minutes down the road

Reply #31 – April 09, 2020, 08:56:14 pm

I wonder if it's the door switch that tells the valve when the door is open or closed?

Re: Step won’t shut till 10 minutes down the road

Reply #32 – April 09, 2020, 08:58:55 pm

Quote from: John Duld – April 09, 2020, 08:56:14 pm

I wonder if it's the door switch that tells the valve when the door is open or closed?

Pretty sure when switch is closed (when door is closed) it closes step so by touching the 2 green wires together on switch I closed the switch but it still didn't change the port that air blew out of.

Don't think not having muffler/diffuser on back side would affect anything??

Re: Step won’t shut till 10 minutes down the road

Reply #33 – April 09, 2020, 09:06:46 pm

Quote from: Tommy D – April 09, 2020, 08:58:55 pm

Pretty sure when switch is closed (when door is closed) it closes step so by touching the 2 green wires together on switch I closed the switch but it still didn't change the port that air blew out of.

Don't think not having muffler/diffuser on back side would affect anything??

Do you have the 12V DC coil?
Did you plumb up the air lines number for number? Or did you go by position?

Re: Step won’t shut till 10 minutes down the road

Reply #34 – April 09, 2020, 09:07:59 pm

OK
one of the wires to the solenoid comes from the door switch, the other should go to a good grounding connection on the chassis.
(if it is like mine)
Make sure you have 12v on one when the door is closed and (ignition on). connect your test meter in between these to coil wires as if it was the solenoid (should have 12v)
This is to insure the ground wire has a good connection, and ohm test on the ground wire to a known good ground would be better.

You had stated earlier that you could hear the valve "click" (I believe) so this is puzzling because that should mean the valve piston is shifting. Can you hear the new valve actuate also?

Re: Step won’t shut till 10 minutes down the road

Reply #35 – April 09, 2020, 09:15:21 pm

Quote from: FourTravelers – April 09, 2020, 09:07:59 pm

OK
one of the wires to the solenoid comes from the door switch, the other should go to a good grounding connection on the chassis.
(if it is like mine)
Make sure you have 12v on one when the door is closed and (ignition on). connect your test meter in between these to coil wires as if it was the solenoid (should have 12v)
This is to insure the ground wire has a good connection, and ohm test on the ground wire to a known good ground would be better.

You had stated earlier that you could hear the valve "click" (I believe) so this is puzzling because that should mean the valve piston is shifting. Can you hear the new valve actuate also?

Yes can still here the click.

Will take apart and test the 2 wires at the valve to make sure I have 12v there and will try to track down the ground wire

Re: Step won’t shut till 10 minutes down the road

Reply #36 – April 09, 2020, 09:55:17 pm

Yep
make sure you have a good connection to ground on the white wire, the "click" could be the coil pulling in and dropping right back out.
Remember......... remote troubleshooting isn't the easiest way, just throwing darts here.

Re: Step won’t shut till 10 minutes down the road

Reply #37 – April 09, 2020, 11:01:41 pm

Quote from: FourTravelers – April 09, 2020, 09:55:17 pm

Yep
make sure you have a good connection to ground on the white wire, the "click" could be the coil pulling in and dropping right back out.
Remember......... remote troubleshooting isn't the easiest way, just throwing darts here.

Any help is better than none, thanks for your patience! I know just enough to be dangerous!

Re: Step won’t shut till 10 minutes down the road

Reply #38 – April 10, 2020, 06:20:49 am

Are you putting the part in a vise?, if not that would work.

Re: Step won’t shut till 10 minutes down the road

Reply #39 – April 10, 2020, 08:14:06 am

Quote from: Old Toolmaker – April 09, 2020, 09:06:46 pm

Do you have the 12V DC coil?
Did you plumb up the air lines number for number? Or did you go by position?

I did follow the air line position # for #.

What do you mean by "do you have the 12v DC coil"?
If you mean the plug they supplied I will check that out. Sorry not too fluent in electrical or mechanical lingo.

Re: Step won’t shut till 10 minutes down the road

Reply #40 – April 10, 2020, 08:44:23 am

Do have 12v valve and checked and do have 12v at the plug in to the coil on the valve.

My job is getting in the way this morning so will look for ground later

Re: Step won’t shut till 10 minutes down the road

Reply #41 – April 10, 2020, 08:49:27 am

For lubricating WD40 is NOT good for that, people think that it is for some reason.. the WD stands fro Water Displacer. Use what Rudy mentioned above or if you want the convenience of having it in a can ready to go Aerokroil and CorrosionX along with PB Blaster are good choices to help free stuck parts.

Keith

Re: Step won’t shut till 10 minutes down the road

Reply #42 – April 10, 2020, 08:55:23 am

Quote from: Tommy D – April 10, 2020, 08:14:06 am

I did follow the air line position # for #.

What do you mean by "do you have the 12v DC coil"?
If you mean the plug they supplied I will check that out. Sorry not too fluent in electrical or mechanical lingo.

You will be fluent, you will be.

Two things about the coil that makes the valve work.
The most important is never apply power to the coil when it is off the solenoid. If you do the coil will burn out. The solenoid is the piece of metal that moves inside the coil. In this case the stem on the end of the valve.

The other one is that coils are meant to be exchanged so the valve can be operated with several voltages and AC or DC electricity.

Re: Step won’t shut till 10 minutes down the road

Reply #43 – April 10, 2020, 09:09:31 am

If it's a new valve I would suggest not putting any lubricant in it.
If you must, the best is a oil approved for pneumatic tools.

Re: Step won’t shut till 10 minutes down the road

Reply #44 – April 10, 2020, 09:42:30 am

Quote from: FourTravelers – April 10, 2020, 09:09:31 am

If it's a new valve I would suggest not putting any lubricant in it.
If you must, the best is a oil approved for pneumatic tools.

Adding a lubricant is counter productive. If a lubricant is necessary it would have been added at the time of manufacture. Adding oil now only washes out the lubricant. These valves are meant to be used with dry clean air.

Re: Step won’t shut till 10 minutes down the road

Reply #45 – April 10, 2020, 09:50:25 am

Haven't seen one post about verifying the air pressure with another gauge.

Re: Step won’t shut till 10 minutes down the road

Reply #46 – April 10, 2020, 09:56:06 am

Quote from: John44 – April 10, 2020, 09:50:25 am

Haven't seen one post about verifying the air pressure with another gauge.

Haven't tried verifying. But if I switch airlines on the output side the step does close. Problem is cant get the solenoid to change Air to the other output line through the solenoid. At least the way I understand that it is supposed to work.

Re: Step won’t shut till 10 minutes down the road

Reply #47 – April 10, 2020, 09:57:39 am

Quote from: hdff – April 10, 2020, 08:49:27 am

For lubricating WD40 is NOT good for that, people think that it is for some reason.. the WD stands fro Water Displacer. Use what Rudy mentioned above or if you want the convenience of having it in a can ready to go Aerokroil and CorrosionX along with PB Blaster are good choices to help free stuck parts.

Keith

Thanks for the heads up, I haven't applied any wd40 to the new valve.

Re: Step won’t shut till 10 minutes down the road

Reply #48 – April 10, 2020, 10:30:34 am

Quote from: FourTravelers – April 06, 2020, 09:08:50 pm

how much pressure is showing on the regulator?

If you have about 60 psi then turn the regulator down to "0" and remove the air lines from the valve to the cylinders, turn regulator back up to about 60 psi and you should have air escaping on the N.C. port. Try actuating the valve again with your door or magnet and see if the air switches from the N.C. port to the N.O. port. If not then the valve is stuck or has an obstruction. If it does and you have plenty of air flow on the N.O. port, try connecting just the N.O. port back up (this port should retract the step) and check for "blow by" through the cylinders.

Disclaimer........... I have a U280 GV and this worked on mine......... yours may be different.

Good Luck!

I have been doing the testing as described above at low psi. Do I need to turn it up to 60psi to get the solenoid to work? Have only been turning it up until I hear air coming out of the bottom port. So in other word does the air regular need to be at or close to 60psi to make the valve switch from bottom port to top port?? Or does the valve switch with the 12v applied by closing the door?

Re: Step won’t shut till 10 minutes down the road

Reply #49 – April 10, 2020, 11:01:31 am

I have one in the shop, will test it shortly.

without air the valve doesn't move on mine

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