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Old 12-08-2018, 09:26 AM   #1
N2BchMtnMrsh
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Cold Weather Hydraulics

We are moving from So Cal to Denver. On the trip of moving our Montana, stopping in Kingman, AZ, Grants, NM and then Aguilar, CO, we noticed that our slide outs and leveling jacks do not work very well in cold weather. In Grants, it dropped to 7 degrees. The landing jacks, when retracting, would stop as if they had reached top but were still extended. And thus we had to restart the cycle, sometimes 4-5 times, before they would fully retract. Same with the slide outs, they would stop, and then we would have to stop and restart the extension to get them fully out. Is there something we need to do to the hydraulics in cold weather?
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Old 12-08-2018, 10:48 AM   #2
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Originally Posted by N2BchMtnMrsh View Post
We are moving from So Cal to Denver. On the trip of moving our Montana, stopping in Kingman, AZ, Grants, NM and then Aguilar, CO, we noticed that our slide outs and leveling jacks do not work very well in cold weather. In Grants, it dropped to 7 degrees. The landing jacks, when retracting, would stop as if they had reached top but were still extended. And thus we had to restart the cycle, sometimes 4-5 times, before they would fully retract. Same with the slide outs, they would stop, and then we would have to stop and restart the extension to get them fully out. Is there something we need to do to the hydraulics in cold weather?
I replaced the 50amp to the hydraulic pump with an 80amp.
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Old 12-08-2018, 11:18 AM   #3
1retired06
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Most of us have made that upgrade. It is a reset mounted to the back wall easily traceable to the pump.
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Old 12-08-2018, 01:06 PM   #4
carl n susan
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Lippert has recommendations for the hydraulic fluid to use. There is a document in the Files section describing their recommendations. Clicky

In colder temperatures (less than 10° F) the cylinders and jacks may extend and retract slowly due to the fluid’s molecular nature. For cold weather operation, fluid specially formulated for low temperatures may be desirable. Please consult factory before using any other fluids.

Additionally consider adding a quart or two of anti-stiction fluid. It is intended to stop the popping, bumps and clunks but may also help in cold weather. Read LIP Sheet 0295 HERE
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Old 12-08-2018, 01:27 PM   #5
GLS3950
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On cold weather the hydraulic oil thickens and takes more amps to run the pump. They o ly put a 40 amp auto reset breaker in. Lippert says to install a 80 amp in. That should take care of your problem.
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Old 12-08-2018, 02:18 PM   #6
rohrmann
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Quote:
Originally Posted by N2BchMtnMrsh View Post
We are moving from So Cal to Denver. On the trip of moving our Montana, stopping in Kingman, AZ, Grants, NM and then Aguilar, CO, we noticed that our slide outs and leveling jacks do not work very well in cold weather. In Grants, it dropped to 7 degrees. The landing jacks, when retracting, would stop as if they had reached top but were still extended. And thus we had to restart the cycle, sometimes 4-5 times, before they would fully retract. Same with the slide outs, they would stop, and then we would have to stop and restart the extension to get them fully out. Is there something we need to do to the hydraulics in cold weather?



What year Montana do you have? Only install a larger breaker if the wiring from the battery to the hydraulic pump is #4 copper, which is what is used on the newer rigs. Not sure what wire size was used to power the hydraulic pump on the older rigs, but oversizing a breaker on wire that is too light can cause problems. If the wiring is good, the 80 amp breaker will fix the problem. Once I replaced our breaker, even in subfreezing temps, the system works with no stopping.
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Old 12-08-2018, 02:25 PM   #7
Golfmedik
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If the wire is big enough, here is the type breaker you need. NOTE: you may have to drill out the eyelets of the connectors to 1/4" to get them on the posts.
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File Type: jpg 80Aautoresettingbreaker.jpg (19.4 KB, 68 views)
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Old 12-08-2018, 09:29 PM   #8
N2BchMtnMrsh
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I apologize, I have a 2013 Montana, Model 3750FL. Thank you for all the answers. Are you saying to replace the entire pump or just the fuse? I am a bit confused.
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Old 12-08-2018, 09:58 PM   #9
1retired06
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Just the breaker
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Old 12-08-2018, 10:00 PM   #10
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Just the breaker.
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Old 12-08-2018, 10:47 PM   #11
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Quote:
Originally Posted by N2BchMtnMrsh View Post
I apologize, I have a 2013 Montana, Model 3750FL. Thank you for all the answers. Are you saying to replace the entire pump or just the fuse? I am a bit confused.
Just the breaker if the wiring is #4 or bigger!
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