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Forums13
Topics7,385
Posts40,939
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Most Online3,137
Apr 9th, 2026
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Joined: Sep 2014
Posts: 170 Likes: 2
member
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member
Joined: Sep 2014
Posts: 170 Likes: 2 |
I have heard several horror stories about the I2 up leveling adjuster. I took a call on an old DMC that will not run up. The gauge port between the pump and the valve reads about 40psi when it's running. Looks like it is trying to run but the thing sits there. The coils are good as they are energizing but the thing sits there.
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Joined: Jan 2019
Posts: 82
Chilling
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Chilling
Joined: Jan 2019
Posts: 82 |
Does it run in inspection?
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Joined: Feb 2013
Posts: 800
old hand
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old hand
Joined: Feb 2013
Posts: 800 |
If the valve or MR is cold, you may need to run till it warms up. I have had that happen a number of times.
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Joined: May 2011
Posts: 338
Mechanic
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Mechanic
Joined: May 2011
Posts: 338 |
If that leveling adjuster screen is plugged up that's exactly what will happen. The screen is so fine your better off just replacing it, I wouldn't even try to clean it. All our guys carry a spare one in their trucks its such a common occurrence.
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Joined: Dec 2010
Posts: 639 Likes: 4
addict
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addict
Joined: Dec 2010
Posts: 639 Likes: 4 |
On this DMC, check for broken shunt wires on the TSL limit switch assy. If it’ll run up on INSP but won’t move up at all on auto, that’s classic TSL symptom.
True also is the clogged up leveler screen.
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Joined: Dec 2015
Posts: 1,766 Likes: 11
ElevatorPractitioner
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ElevatorPractitioner
Joined: Dec 2015
Posts: 1,766 Likes: 11 |
Definitely sounds like the screen is clogged. Do anything but tear the screen off! I hope that sounds as ridiculous to all of you as it is but you would be surprised how often I find a car with these symptoms and go to replace the part only to find someone has just ripped the screen off. Pretty much screwed at that point. Best just to keep them on the truck.
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Joined: Sep 2014
Posts: 170 Likes: 2
member
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member
Joined: Sep 2014
Posts: 170 Likes: 2 |
Thanks, I will check all of the possible causes mentioned. The machine room is quite warm so that one has been eliminated.
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Joined: May 2015
Posts: 71
journeyman
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journeyman
Joined: May 2015
Posts: 71 |
Also will reduce leveling speed if O Ring on up leveling adjuster is leaking
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Joined: Dec 2015
Posts: 1,766 Likes: 11
ElevatorPractitioner
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ElevatorPractitioner
Joined: Dec 2015
Posts: 1,766 Likes: 11 |
God point, with bad o-rings it can also turn itself out on its own until you have no up level speed. If you can turn it by hand the o-rings need to be replaced.
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Joined: Sep 2014
Posts: 170 Likes: 2
member
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member
Joined: Sep 2014
Posts: 170 Likes: 2 |
Turns out there were 2 broken wires and a broken contact. Thanks for the help, was not looking forward to pulling the pump and I learned a little about Dover equipment t.
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Joined: Feb 2013
Posts: 800
old hand
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old hand
Joined: Feb 2013
Posts: 800 |
That doesn't compute with the original post. If the coils were energized the car should move up; if it wasn't moving with energized coils, it indicates a valve issue. Cannot understand how the broken wires caused a hydraulic issue.
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HW PM
by Chris, January 13
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