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Old 12-05-2005, 02:54 PM   #1
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Have a problem with front curbside HWH leveling jack in that it will retract when extend signal is removed. Tried opening the "T" handles on back of each valve to clear debris stuck in valve and then cycling jack in auto and manually, but each time the jack will retract whenever extend signal is removed. Also noted that jack will extend whenever extending one of the slides and then retract when slide extend is finished. Must be a check valve or needle valve stuck open somewhere. Additionally, took the reservoir dip stick out and found no oil level but dip stick has a hex hole in bottom and I think there should have been some sort of hex shaped rod fitted to the end of it w/scale to read hyd level. Took a long screwdriver and measured about 2.5" of hyd fluid in reservoir. This was w/3 jacks and 4 slides extended.
Any suggestions?
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Old 12-05-2005, 02:54 PM   #2
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Have a problem with front curbside HWH leveling jack in that it will retract when extend signal is removed. Tried opening the "T" handles on back of each valve to clear debris stuck in valve and then cycling jack in auto and manually, but each time the jack will retract whenever extend signal is removed. Also noted that jack will extend whenever extending one of the slides and then retract when slide extend is finished. Must be a check valve or needle valve stuck open somewhere. Additionally, took the reservoir dip stick out and found no oil level but dip stick has a hex hole in bottom and I think there should have been some sort of hex shaped rod fitted to the end of it w/scale to read hyd level. Took a long screwdriver and measured about 2.5" of hyd fluid in reservoir. This was w/3 jacks and 4 slides extended.
Any suggestions?
05 40FDQS
BT
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Old 12-09-2005, 08:38 AM   #3
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bigfish you should read your reservoir tank with all jacks an slides retracted for correct level. You may need to add fluid. "007"
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Old 12-09-2005, 03:29 PM   #4
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Per Rex @ WRV took MH to Cummins Southeastern Power in Ocala, FL. They troubleshot it to the valve (2nd from front) that operates the problem jack a couple of days ago. They ordered a replacement valve from HWH and it was received this morning. Valve was installed in a couple of hours. Everything works as it should now. What I thought was a dip stick for the hyd reservoir is just a breather. You need a stick about 1/4" dia rod & 8" long down breather hole to check level. Like you said, "slides in, jacks up" to get correct level reading.

Also, they replaced the "cylinder block cup plug boss" per Cummins service directive C0439 after running engine number through their computer system. Seems there are some 400 ISL engines that may require this change.

Another BigFish Story,
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Old 12-13-2005, 07:33 AM   #5
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I have been told (validated with inspection) that the vanity slide rams are in the extended position when the slde is closed. Accordingly, with all slides closed, you actually have "more" fluid in the system than the dip stick indicates. Guess the key here is not to over fill as you may need the room for expansion should you only extend the vanity slide.
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