View Poll Results: Should the leveling jacks be down during winter storage?
Yes 14 24.14%
No 25 43.10%
Doesn't matter 15 25.86%
No opinion 4 6.90%
Voters: 58. You may not vote on this poll

Reply
 
Thread Tools Search this Thread Display Modes
 
Old 05-12-2008, 11:48 PM   #15
4 Rivet Member
 
ctdair's Avatar
 
Join Date: Oct 2003
Posts: 328
Images: 3
If they are single action spring retract,when they are retracted there is no oil protecting the bore of the cylinder it has all returned to the resivor. The rod may be inside but everything is subject to corrosion then.The way to best protect is to leave extened and coat the rod surface with grease.This is the reccomended method for storing Meyer snowplow lift cylinders.
__________________

__________________
"Forbidden Wheels Clubhouse Recon Team"
S/OS #010
2004 30ft Slide Out with Hensley Arrow hitch. Pulled By 2010 Dodge 2500 Diesel 4x4 Megacab
ctdair is offline   Reply With Quote
Old 05-13-2008, 05:59 AM   #16
Rivet Master
Commercial Member
 
lewster's Avatar
 
Vintage Kin Owner
Naples, FL , Hood River, OR
Join Date: Dec 2005
Posts: 7,279
Quote:
Originally Posted by ctdair
If they are single action spring retract,when they are retracted there is no oil protecting the bore of the cylinder it has all returned to the resivor. The rod may be inside but everything is subject to corrosion then.The way to best protect is to leave extened and coat the rod surface with grease.This is the reccomended method for storing Meyer snowplow lift cylinders.
Not correct............ in an HWH jack, all of the oil is not removed from the cylinder in the retract position. The piston is ALWAYS coated with fluid! ......and fluid is ALWAY inside the jack cylinder.
__________________

__________________
Lew Farber...ABYC Certified Master Marine Electrician...RVIA Certified Master Tech ...AM Solar Authorized Installation Center...AIRSTREAM Solar & Electrical Specialist...Micro Air 'Easy Start' Sales and Installations
lewster is offline   Reply With Quote
Old 05-13-2008, 08:43 AM   #17
4 Rivet Member
 
ctdair's Avatar
 
Join Date: Oct 2003
Posts: 328
Images: 3
If it is single acting there is no oil in front of the piston , hence the springs to retract it as the oil is forced back to the oil tank by the weight of the vehicle and then the springs. If the jack is say 10 inches long then the front portion say at least 9 inches of the bore is not oil filled when retracted. the rear of the piston and the seal may have oil coating them or behind them in the lines between them and the tank. the rod is plated to give a smooth wear surface for the seal and the bushing that supports it through the end of the cylinder. The bore of the cylinder is machined so that the piston and seal can keep the fluid behind it and extend the jack. if this interior bore surface corrodes then jack leaks past the piston and has less or no lifting. On single acting jacks if You see oil leaking past the rod end seal then it has leaked past the piston first.
__________________
"Forbidden Wheels Clubhouse Recon Team"
S/OS #010
2004 30ft Slide Out with Hensley Arrow hitch. Pulled By 2010 Dodge 2500 Diesel 4x4 Megacab
ctdair is offline   Reply With Quote
Old 05-13-2008, 09:03 AM   #18
4 Rivet Member
 
ctdair's Avatar
 
Join Date: Oct 2003
Posts: 328
Images: 3
Hydraulic Ram, Hydraulic Lift
Hydraulic Cylinder Maintenance
__________________
"Forbidden Wheels Clubhouse Recon Team"
S/OS #010
2004 30ft Slide Out with Hensley Arrow hitch. Pulled By 2010 Dodge 2500 Diesel 4x4 Megacab
ctdair is offline   Reply With Quote
Old 05-13-2008, 11:32 AM   #19
4 Rivet Member
 
ctdair's Avatar
 
Join Date: Oct 2003
Posts: 328
Images: 3
On a ram there will be a thin film of oil between the rod and the bore as there is no traditional piston/seal set up. This film will be the difference between the outer diameter of the ram and the inner diameter of the cylinder. Lewster is correct then that all the oil will not return to tank. However if You follow the above links advice it indicates store extended and following is a quote from Meyers Snow plowStoring the Plow and Hydraulic Unit After you have disconnected the plow from your vehicle, extend the lift cylinder to end of the stroke and coat the lift rod with light grease. This fills the cylinder with hydraulic fluid and protects the interior and exterior from rust and corrosion. Also coat the exposed portions of the power angling cylinder rods with light grease. Be sure to reconnect the quick couplers at the Power Angling rams and plug in the weather plugs on Hydraulic Unit to keep them clean and to prevent contamination of the system. Coat all pivot pins and other wear points with chassis lubricant. Unplug all electrical connections at the power unit. Coat all connections with a dielectric compound to prevent corrosion and plug them into their corresponding weather plugs. Unplug the plow lights, tape or use dielectric compound at light connections to prevent corrosion. WARNING: THE LIFT ARM EXTENDS BEYOND THE BUMPER OF THE VEHICLE. TO MINIMIZE DAMAGE IN A FRONT END COLLISION, THE LIFT ARM SHOULD BE REMOVED FROM THE VEHICLE WHEN YOUR SNOWPLOW IS REMOVED.
Meyer M-2 Hydra-Flush should be used to flush contaminants from the system. It should also be used for off-season storage.



I know it is not a jack on a MH but the same ram principle applies and I have maintained rebuilt lots of Meyer plows and have 1 year of college hydraulic courses for a 4 year apprenticeship program for a mechanical and hydraulic Journeyman's Card.
There is no one way that is better than the other or foolproof but the purpose of these and other discussions is to gather everyones ideas and then make Your decision







































__________________
"Forbidden Wheels Clubhouse Recon Team"
S/OS #010
2004 30ft Slide Out with Hensley Arrow hitch. Pulled By 2010 Dodge 2500 Diesel 4x4 Megacab
ctdair is offline   Reply With Quote
Old 05-13-2008, 04:17 PM   #20
Rivet Master
Commercial Member
 
lewster's Avatar
 
Vintage Kin Owner
Naples, FL , Hood River, OR
Join Date: Dec 2005
Posts: 7,279
Quote:
Originally Posted by ctdair
If it is single acting there is no oil in front of the piston , hence the springs to retract it as the oil is forced back to the oil tank by the weight of the vehicle and then the springs. If the jack is say 10 inches long then the front portion say at least 9 inches of the bore is not oil filled when retracted. the rear of the piston and the seal may have oil coating them or behind them in the lines between them and the tank. the rod is plated to give a smooth wear surface for the seal and the bushing that supports it through the end of the cylinder. The bore of the cylinder is machined so that the piston and seal can keep the fluid behind it and extend the jack. if this interior bore surface corrodes then jack leaks past the piston and has less or no lifting. On single acting jacks if You see oil leaking past the rod end seal then it has leaked past the piston first.
Not to get into a pissing contest here, but you are comparing apples and oranges and unless your certifications include HWH manufactured RV-specific jacks, you are not correct. If you like call HWH at 1-800-321-3493 and confirm, as I just did, that there is ALWAYS oil surrounding the HWH jack in the retracted position.

If you are in further doubt, pull the bottom plug from one of their jacks and watch the fluid run out.

I'm sure that you know about snowplow rams and other industrial hydraulics, but these are a different animal.

And by the way, I also hold a Master's Degree in Engineering and advanced training certifcates in RV hydraulic systems.
__________________
Lew Farber...ABYC Certified Master Marine Electrician...RVIA Certified Master Tech ...AM Solar Authorized Installation Center...AIRSTREAM Solar & Electrical Specialist...Micro Air 'Easy Start' Sales and Installations
lewster is offline   Reply With Quote
Old 05-13-2008, 04:32 PM   #21
4 Rivet Member
 
ctdair's Avatar
 
Join Date: Oct 2003
Posts: 328
Images: 3
No p contest just sharing of knowledge , experience , ideas any chance they have a exploded diagram?Will try to find out.
__________________
"Forbidden Wheels Clubhouse Recon Team"
S/OS #010
2004 30ft Slide Out with Hensley Arrow hitch. Pulled By 2010 Dodge 2500 Diesel 4x4 Megacab
ctdair is offline   Reply With Quote
Old 05-13-2008, 04:54 PM   #22
TOG Unit Member
 
1979 31' Excella 500
1995 36' Classic 36
Marietta , Georgia
Join Date: Sep 2007
Posts: 18
Gentlemen, You have been a fantastic source of information. I appreciated it. I will check the HWH operation upon my return as I am away on business for another 10 days or so. I do frequently cycle the HWH system, at least one per month. The campsite, "looks very level," and I
__________________
BudClem is offline   Reply With Quote
Old 05-13-2008, 04:56 PM   #23
4 Rivet Member
 
ctdair's Avatar
 
Join Date: Oct 2003
Posts: 328
Images: 3
No p contest just sharing of knowledge , experience , ideas any chance they have a exploded diagram?Will try to find out.
__________________
"Forbidden Wheels Clubhouse Recon Team"
S/OS #010
2004 30ft Slide Out with Hensley Arrow hitch. Pulled By 2010 Dodge 2500 Diesel 4x4 Megacab
ctdair is offline   Reply With Quote
Old 05-13-2008, 04:56 PM   #24
TOG Unit Member
 
1979 31' Excella 500
1995 36' Classic 36
Marietta , Georgia
Join Date: Sep 2007
Posts: 18
do not get the "excess slope" indictor. If the jack doesn't retract, how can I get it up? 3/4 retract fine, simply one rear doesn't. Thanks again, I will call HWH as suggested. This is the greatest Airstream forum!
__________________
BudClem is offline   Reply With Quote
Old 05-13-2008, 05:04 PM   #25
4 Rivet Member
 
ctdair's Avatar
 
Join Date: Oct 2003
Posts: 328
Images: 3
No p contest just sharing of knowledge , experience , ideas any chance they have a exploded diagram?Will try to find out.
__________________
"Forbidden Wheels Clubhouse Recon Team"
S/OS #010
2004 30ft Slide Out with Hensley Arrow hitch. Pulled By 2010 Dodge 2500 Diesel 4x4 Megacab
ctdair is offline   Reply With Quote
Old 05-13-2008, 05:08 PM   #26
4 Rivet Member
 
ctdair's Avatar
 
Join Date: Oct 2003
Posts: 328
Images: 3
Oooops posted that too many times.Have to learn my blackberry better.
__________________
"Forbidden Wheels Clubhouse Recon Team"
S/OS #010
2004 30ft Slide Out with Hensley Arrow hitch. Pulled By 2010 Dodge 2500 Diesel 4x4 Megacab
ctdair is offline   Reply With Quote
Old 05-13-2008, 05:14 PM   #27
4 Rivet Member
 
ctdair's Avatar
 
Join Date: Oct 2003
Posts: 328
Images: 3
Sorry about the multiples , guess I stuttered on my blackberry
__________________
"Forbidden Wheels Clubhouse Recon Team"
S/OS #010
2004 30ft Slide Out with Hensley Arrow hitch. Pulled By 2010 Dodge 2500 Diesel 4x4 Megacab
ctdair is offline   Reply With Quote
Old 05-13-2008, 07:15 PM   #28
Rivet Master
Commercial Member
 
lewster's Avatar
 
Vintage Kin Owner
Naples, FL , Hood River, OR
Join Date: Dec 2005
Posts: 7,279
Quote:
Originally Posted by BudClem
do not get the "excess slope" indictor. If the jack doesn't retract, how can I get it up? 3/4 retract fine, simply one rear doesn't. Thanks again, I will call HWH as suggested. This is the greatest Airstream forum!
BC,

You might be having a problem with your retract solenoid not fully opening to allow the fluid to travel from the jack back into the reservoir.

First, you have to identify the hydraulic hose that comes from the non-retracting jack. Then, follow it to the solenoid where it connects to the pump manifold.

On the end of the solenoid, you will either have a 'T' handle or a 1/4" hex nut. You have to open this all the way counter clockwise. This 'should' allow the fluid back into the reservoir from the jack and allow it to retract by the force of the 2 springs. You also might try to use a leveredge bar at this point to raise the jack, incase your springs are weak and need replacing.

If this doesn't work, your next move is to leave the nut/T-handle open and remove the hydraulic hose. Be prepared for a stream of fluid!!!... and have a vessel ready to catch and contain it.

If you don't get fluid out of the hose from the retract action of the jack, and you can't raise it with a leveredge bar, you have a bad jack that needs to be replaced!!!

I have had to replace 4 jacks on a coach with this same problem!!!

Hope this helps!
__________________

__________________
Lew Farber...ABYC Certified Master Marine Electrician...RVIA Certified Master Tech ...AM Solar Authorized Installation Center...AIRSTREAM Solar & Electrical Specialist...Micro Air 'Easy Start' Sales and Installations
lewster is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:52 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.