slideout hydralic hoses has bubbles

Sorry, Doug. Hoses are a lot more expensive than steel tube and are serious reliability issues, even on airplanes where cost isn't usually part of the equation. The only places Boeing used hoses is where there wasn't a reasonable alternative.

CRES tubing is a lot cheaper than multi-layer flexible hoses and was used on both Concorde and TSR-2, which had 4000 psi systems. Having been retired from Boeing for a while, I don't know if the 787 went to 4000 psi. I know they were considering it.

Bottom line is, if the actuator body does not move, hoses are a waste of money. Rigid lines are cheaper and more reliable.

Sooooo........

Yeah, definitely replace them. You're running on borrowed time if they are bubbling that bad. Like inferred above, they probably used the cheapest hoses available and the stainless weave is bowing to the pressure. A failure of the line can not only just make your slide stop working and an inopportune time, a high pressure blowout of a line can cause damage to your coach and injury if anyone is nearby when it blows.

frankdamp wrote:
Change them ASAP, otherwise you may be stuck being unable to retract the jacks. As a former aerospace hydraulics engineer, I don't understand the reliance on hoses. The actuators are in a fixed position and don't move with actuation. It should be a no-brainer to plumb the system with rigid CRES tubing. Using hoses is a cheap and nasty way of building in obsolescence.

I would think, given your Expertise, that you would understand the COST difference in hoses versus the CRES tubing. CORRECT Hyd hoses is never a problem, (HWH/Powergear/RVA/ Bigfoot)but LCI used a CHEAP inexpensive HYD hose for their systems and unfortunately other systems get tarnished with the LCI cheapness. IF you understood the Manufacturing process of Motorhomes AND Towables, you would see rigid type CRES tubing is NOT practical to install and use. The working pressure is around 2800 to 3200 psi and the HWH type hose is rated at I believe 5000 psi. The LCI is rated I believe at 3500. LCI hoses on both towables and motorhomes have a high failure(leak and/or burst) and bubble failure rate. Doug

Change them ASAP, otherwise you may be stuck being unable to retract the jacks. As a former aerospace hydraulics engineer, I don't understand the reliance on hoses. The actuators are in a fixed position and don't move with actuation. It should be a no-brainer to plumb the system with rigid CRES tubing. Using hoses is a cheap and nasty way of building in obsolescence.

go to a good hyd shop or farm equipment store. They want do that again.