Spicer TIMS (Tire Inflation and Monitor System) for Trailers Installation Guide - Manual (Page 22)

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Installation
Axle Vent Installation
1. Install a 1/4" NPT male to 3/8" NTA fitting in the 1/4"
pipe thread located on the axle for venting.
2. Run 3/8" OD Nylon Air Brake Tubing to the frame and
position the end facing down to prevent contamina-
tion. See illustration below.
3. Secure tubing as required.
CAUTION: Position the end of the vent tube down to
prevent contamination of the axle.
CAUTION: Failure to properly install axle vent may
result in wheel end pressurization and/or water inges-
tion which could cause wheel end failure.
Control Line Installation
A pressure protection value (PPV) is recommended between
the trailer air supply tank and the Tire Maintenance System
controller assembly. An existing suspension PPV can also be
used to supply air to the suspension as well as the Tire Main-
tenance System.
Proper Tire Maintenance System operation requires correct
air line diameters and lengths. The following diagrams show
air brake tubing lengths and sizes and associated fittings
required to complete the system installation.
CAUTION: To prevent twisting air line inside axle when
tightening fittings to the axle hose fitting, use a wrench
to hold the axle hose fitting.
CAUTION: Proper Tire Maintenance System operation
requires correct air line diameters and lengths. Installa-
tion sizes and lengths must be within limits shown.
CAUTION: Proper Tire Maintenance System operation
requires correct air line connections. All junctions of
two or more 1/4" lines MUST “upsize” to 3/8" line for
adequate flow.
CAUTION: To prevent contamination of the Tire Mainte-
nance System, do not install fitting on the bottom of
the air supply tank.
Additional Axles
For systems with 3 or 4 axles, observe the installation require-
ments as shown in the following diagrams. Extend the main 3/
8" run as necessary. However, all total line lengths must still
remain within the limits listed on the diagrams.
Trailer Frame Rail
Vent Fitting
1/4" NTP to 3/8"
Nylon Tubing
Adapter
Trailer
Axle
Front of Trailer
Axle Vent Hose
(minimum 3/8" OD
nylon air brake tubing)