Airstream CLASSIC TRAILER - Manual (Page 42)

D
EXTERIOR
D - 4
POWER JACK
A switch located on the bottom of the housing operates the power jack. When the jack
is fully extended or retracted internal limit switches automatically shut off the motor.
Another switch operated the convenience light.
Should an electrical failure occur, remove the power head by loosening the two Allen
set screws. The jack post may now be operated manually by inserting the emergency
handle into the coupling on top of the post.
Replacing Power Head
It is essential that the following procedure be used before the power head is replaced
on the post.
1. With 12 volts connected, ground the power head to trailer “A” frame. Operate main
switch in “post retracting direction” until the motor stops automatically.
2. Using emergency handle, crank post clockwise by hand until fully retracted, then
turn crank one turn counterclockwise.
3. Replace head on post and make sure that drive pin is engaged with post coupler.
Tighten Allen set screws.
NOTICE: Leave tow vehicle transmission in neutral when lifting both units. Dolly wheels
are not recommended. Always retract stabilizing jacks before using your Super Jack
under load.
Maintenance
1. Every two years remove screws and cover and check grease condition. Use HMP
grease similar to lubricate 630AA and spread on gear teeth, Grease is not required
on the nylon timing gears. No internal lubrication of the post is required, but an
occasional external application of a silicone or WD-40 spray lubricant on the inner
tube of the post when extended is permissible.
2. Before replacing the cover ensure that the plate and limit switch unit are
located correctly.
3. Apply a little sealing compound around the mating surface of the gear cover and
replace screws tightening them diagonally. Check synchronization if head has
been removed from the post.
4. A little penetrating oil on the Allen setscrews occasionally will help prevent
corrosion and difficult removal.