RVA Jacks are single acting hydraulic cylinders. This means they are only under hydraulic pressure when extending the jack. Each jack is retracted using the external spring(s) pressure.
Located at the top of each jack is a flow control valve. The flow control valve slows down the retract speed of the jack, when the jack is supporting the weight of the coach. As the weight of the coach is removed from the jack, the retract speed will increase.
Normal retraction time for all jacks to be retracted 45-55 seconds in 60-80 degree temperature. However, when the temperature drops and approaches freezing, the fluid becomes thicker and flows more slowly back to the reservoir. Consequently retraction time can significantly increase.
If you are seeing the jack retract times take significantly longer than 55 seconds:
- Swap the springs on the affected jack(s) and retest. If the problem follows the springs, then replace the springs for that jack.
- If the problem is still persisting, then remove the retract solenoids and check for foreign objects, clean and retest.
- If retract times do not improve, then swap the corresponding retract solenoid with one that is retracting at a normal rate. If the problem follows the solenoid, then replace the solenoid.
Parts mentioned in this article: