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Old 06-02-2021, 11:47 PM   #1
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Rear hydraulic jack not retracting all the way

Getting the motorhome ready for it's first trip next week and when I aired it up and stowed the jacks, I found that the left rear jack had retracted all the way, but the right rear one still had about 2" of travel. I recycled them several times, but it stays about the same and shows jacks stowed on the control panel. I really don't want to take it into a shop ay $169 an hour and between a two and 8 week wait, soooo. I'm thinking that maybe, I'll retract them both and open the fill plug on the reservoir and then put a bar under the jack and try to force it up and mebbee burp it, if that what it needs. I have had the filler open with the jack in that position and there is no pressure on the system.
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Old 06-02-2021, 11:53 PM   #2
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Try extending the jack wipe down the shaft and spray it with Teflon spray or in a pinch WD40. My jacks have a zerk fitting so I give them a shot of grease every so often also.
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Old 06-04-2021, 01:52 AM   #3
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Perhaps there is a problem with the nylon guide in the cylinder.


Look here.


https://www.1999southwind.com/power-...jack-teardown/
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Old 06-04-2021, 07:48 AM   #4
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Being the age of your m/h and I'm guessing it's the HWH system you probably have internal issues with the cylinder which is quite common. You have the option to remove it and send it to HWH to get rebuilt or if you have a local hyd. shop they should be able to do it as well. Here it's about 6000 Cdn to get it done and I think it's $250-$400US if you remove and send them to HWH but don't quote me on that it's been awhile since I checked with them. My problem is the shipping from Can. and waiting for them if I did it that way. Summer is pretty short up here and my rv doesn't fit in my shop.

You can try cleaning and lubing it first but rarely does that solve the problem. Also another thing could be the springs if they are single acting cylinders, there was an updated spring that they came out with. You can tell if you have them if you look, the updated springs will taper down at the ends and the old style doesn't.

It could possibly be the soleniod but usually it the seals in the cylinder.

To get them up no need to remove the fill cap as it should be vented anyway. You can use a board to pry it up or do like me and carry a small floor jack and get them up with that. Mine have been like this for a couple years now and I use the wooden pads under the jacks when I put them down and when ready to move I stow them while I'm doing my other things to get ready to leave then for the 3 that don't retract on their on I can usually pull out the pads or just have to give the jack a little pry and then use my floor jack to get them all the way up. Two of mine won't come up at all which is why I use the pads.

It's a bit of a pain but only takes a few minutes longer to get ready to leave. If you get stuck you can always undo the hyd. line going to the cylinder and get it up that way but it's messy.
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Old 06-04-2021, 12:38 PM   #5
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BUTTON IS PUSHED. SOME JACKS WILL RETRACT.
1.
a. If the jack will not retract, the problem is the hose, velocity valve (if so equipped)
LATER LED’S 3 AND 19 WILL TURN OFF.
IS PUSHED, LED’s 7 AND 20 WILL TURN OFF. 5 SECONDS
PUSHED. TWO SECONDS AFTER THE "STORE" BUTTON
TOUCH PANEL IS ON UNLESS THE "STORE" BUTTON IS
LED’S 19 AND 20 (YELLOW) WILL BE ON WHENEVER THE
SYSTEMS.
IT IS ONLY USED WITH PILOT OPERATED AIR DUMP
VEHICLES EQUIPPED WITH HWH AIR DUMP SYSTEMS.
NOTE: THE TRAVEL RELAY IS NOT USED ON
TRAVEL MODE AND THE IGNITION IS ON.
WILL BE ON IF THE LEVELING SYSTEM IS IN THE
NOTE: THE TRAVEL RELAY IS WIRED AS A
NORMALLY CLOSED RELAY. WHEN THE YELLOW
LED (17) IS ON THE RELAY CONTACTS WILL OPEN.
THE RED LED (18) WILL NOT BE ON. THE RED LED
CONTROL BOX - LED - FUSE LOCATION AND DESCRIPTION
625 SERIES LEVELING SYSTEM
ELECTRICAL CONNECTION DIAGRAM
OR CONNECTION CABLE
PROBLEM WITH THE CONTROL BOX, TOUCH PANEL
NOTE: A LIT YELLOW LED INDICATES THERE
IS A GROUND SIGNAL TO TURN THE
CORRESPONDING RELAY ON.
A LIT RED LED INDICATES THERE IS
VOLTAGE ON IT’S CORRESPONDING OUTPUT PIN.
CORRESPONDING RED LED IS OFF, EITHER
IT’S FUSE IS BLOWN OR THE RELAY IS BAD.
IF THE YELLOW LED’S ARE WORKING BUT
NO RED LED IS COMING ON THERE MAY BE
PROBLEM WITH INPUT VOLTAGE IN THE
4-PIN CONNECTOR.
IF A YELLOW LED IS NOT LIT, THERE IS A
IF A YELLOW LED IS LIT AND THE
BOX CONNECTION INFORMATION.
ELECTRICAL CONNECTION DIAGRAM - CONTROL
INFORMATION ABOUT PIN CONNECTIONS SEE
NOTE: FOR DETAILED INPUT / OUTPUT
+12V
REAR
FRONT
GROUND
RIGHT SIDE
LEFT SIDE
PANEL
TOUCH
+12 ACC TO 28
39
F12
36 37 38
SENSING UNIT
1 3
PIN 1
FUSE
LED
2
DUMP 4
F1
12
11
F2
REAR
RIGHT
REAR
LEFT
5 7
FUSE 7.5 AMP
32F4 F9
21
26
27
25
24
23
22
29 30 31
15
16
F7
RELAY
MASTER
RELAY
F6
14
13
19 6
F8
PUMP
TRAVEL 17
F3
18
8
33 34 35
F10
F11
20
RIGHT
CRX2
FRONT
FRONT
LEFT
CRX1
RIGHT REAR PRESS SW
MASTER WARNING
LINK LIGHT
ACCESSORY OUT FOR
ACCESSORY IN
BOARD ENABLE
PARK BRAKE
JACK INTERRUPT
50 LB PRESS SW INPUT
MASTER WARN CONTROL
3000 LB PRESS SW INPUT
NOT USED
NOT USED
LEFT REAR PRESS SW
38-RED
39-RED
33-GREEN
31-GREEN
30-YELLOW
37-RED
36-RED
35-RED
34-RED
32-RED
29-RED
28-RED
MP85.184C
F11 - 3 AMP
F10 - 10 AMP
RIGHT FRONT PRESS SW
LEFT FRONT PRESS SW
LEFT REAR WARN SW
RIGHT REAR WARN SW
RIGHT FRONT WARN SW
LEFT FRONT WARN SW
CRX 2
TRAVEL OUTPUT
TRAVEL COIL
PUMP OUTPUT
PUMP COIL
MASTER RELAY OUTPUT
MASTER RELAY COIL
DUMP OUTPUT
DUMP COIL
LEFT FRONT OUTPUT
LEFT FRONT COIL
RIGHT FRONT OUTPUT
RIGHT FRONT COIL
LEFT REAR OUTPUT
24-YELLOW
23-YELLOW
22-YELLOW
21-YELLOW
20-YELLOW
19-YELLOW
17-YELLOW
27-RED
26-RED
25-RED
18-RED
CRX 1
15-YELLOW
13-YELLOW
11-YELLOW
7-YELLOW
5-YELLOW
16-RED
14-RED
12-RED
8-RED
6-RED
4-RED
LEFT REAR COIL
RIGHT REAR OUTPUT
RIGHT REAR COIL
RELAY DESCRIPTION
3-YELLOW
1-YELLOW
2-RED
LED
F9 - 5 AMP
F8 - 5 AMP
F7 - 5 AMP
F6 - 5 AMP
F4 - 15 AMP
F3 - 15 AMP
F2 - 15 AMP
F1 - 15 AMP
FUSE
27APR05
MP85.184C
ONE OR MORE JACKS WILL NOT RETRACT WHEN A DOWN ARROW (RETRACT)
The pump should not run when a DOWN ARROW is pushed. If a pump runs when
a DOWN ARROW is pushed, the control box or touch panel is the problem.
2. Open the valve release nut (small valve) 4 1/2 complete turns or the valve release
T-handle (large valve) approximately 5 full turns counter-clockwise.
or the jack. Slowly remove the hose from the jack. If the jack does not retract,
replace the jack. If the jack starts to retract, tighten the hose and loosen the hose
at the manifold. If the jack does not retract, there is a problem with the hose, such
as a kink. If the jack retracts and the manifold is equipped with a velocity valve,
the valve is most likely the problem. If there is no velocity valve, there may be a
check valve or solenoid valve problem. Contact HWH technical service.
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Old 06-05-2021, 05:56 PM   #6
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You never mentioned the brand/model. Did you try using a 2x4 or pry bar (I use a shovel) to help it up?
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Old 08-20-2021, 10:45 PM   #7
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Shot the heck out of the rears with silicone, cycled them a couple of times, washed them down with WD-40 and they are working great now.
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Old 08-22-2021, 04:53 PM   #8
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Glad you got it working
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