User's Manual

Aeris Installation, Service and Troubleshooting Manual
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! WARNING: The use of a drill fixture is recommended. Drilling free hand can create oblong
holes. Drilling should be done at a medium speed. Keep drill straight when boring holes.
Tapping should be done by hand only. Do not use a drill for tapping. The use of a drill to
tap holes can lead to threads being too deep or breaking the tap.
! WARNING: When drilling the 7/16” hole, be careful as the drill bit breaks through the inside
of the axle! The drill bit can hang up causing the drill to twist in your hands. When
breaking through the inside of the axle, apply less pressure and drill at a slower speed.
• Use either an angle drill or standard drill where room permits. Use lubricant for drilling and
tapping holes. With drill fixture is in place (Figure 5) insert the “K” drill bushing in fixture and drill a
pilot hole using a “K’ drill bit. Next insert the 7/16” bushing and drill the hole using a 7/16” drill bit.
Next insert the 9/16” bushing in fixture and using a 1/4-18 NPT tap the hole. Repeat procedure on
all 3 holes in each trailer axle. When tapping holes leave approximately 6-7 threads sticking out of
the axle. STEMCO recommends using an L1 plug gage to measure proper depth. Do not run tap
all the way into the axle.
! WARNING: When finished drilling holes, use a cleaning wand connected to high pressure
air to blow out shavings from inside of the axle. Use safety glasses.
1. Axle
2. Torpedo Level
3. C-Clamp
4. Drilling Fixture
Note:
Before drilling any holes in axle make sure they will
not interfere with any suspension components or
brake components. Contact STEMCO for technical
assistance at 903-758-9981 in U.S.A.
Figure 5