Quote:
Originally Posted by Grumpy Grampa
Thank you. Yes there is two orange hoses, how do you know which one is extend and which one is retract?
Newbe question.
Thanks
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The hose that goes to the top of the cylinder is the high pressure line (normally orange). The hose should be rated a 4,000 psi or more. The hose that connects near the bottom of the cylinder is the low pressure line (normally blue). The low pressure line needs to be rated at 2,000 psi or more.
When lifting the coach the high pressure line supplies the fluid and the bottom hose returns the fluid below the ram seal to the fluid tank and is under little pressure. The pump will shout down if the pressure in the top hose exceeds 3,200 psi. This system applies pressure to the rams in pairs
When retracting the ram the lower hose supplies pressure and the top hose acts as the fluid return. When the the pressure in all lower hoses reaches 1,500 psi the pump shouts off and the retracted light illuminates. Should the pressure in the return line drop to 1,300 psi the alarm will sound (if the parking brake is off) and the panel show jacks down.