Since your coach has no hydraulic jack system, I would guess you have the auxiliary pump to maintain level for the Firestone system.
Many of these small air pumps die from corrosion because they are exposed to the elements.
Check under the coach on the passenger side for a small air pump. Some are under the passenger seat area and others are above the rear axles passenger side.
If you have one, it can be cheaply replaced by a Viar unit.
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2020 Cyclone 4005 Toyhauler 5th wheel 2005 HR Navigator 45 PBQ - SOLD
2005 HR Imperial 42 PBQ - SOLD
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