Spicer CTIS (Central Tire Inflation System) Troubleshooting Guide - Manual (Page 62)

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Service Guidelines
Service Guidelines
CTIS Service
The Central Tire Inflation System requires normal
maintenance much the same as other systems on the vehicle.
Following are some general rules that apply to Central Tire
Inflation service:
Clean and Dry Air Supply
The Spicer Central Tire Inflation System requires a constant
supply of clean dry air. An adequately sized and properly
maintained air dryer is critical for continued proper operation
of the Central Tire Inflation System. Even though the air dryer
may be working properly, moisture can accumulate in the
supply tank during normal operation due to the increase in air
consumption. It is important to drain the supply tank daily.
Draining the supply tank completely (releasing all air pres-
sure) when the truck is not in use will also help keep moisture
under control.
Line Replacement and Routing
When replacing air lines, do not allow kinks, sharp bends or
stretching in order to tighten joints. If any tube or hose seg-
ment does not appear to fit easily, it could mean you are not
using the proper part or that you are not following service
procedures properly. Ensure that replacement lines are the
correct length and size. Be cautious of any contaminants (rub-
ber flash, plastic particles, etc.) getting in the lines when
replacing them.
Each segment of the pneumatic system must be secured to
the vehicle frame or other installed line. After completing
assembly of each segment, use cable ties to anchor the seg-
ment at approximately 18” intervals.
Proper Central Tire Inflation System operation requires cor-
rect air line diameters and lengths. Incorrect air line
replacement can affect both performance and operation of
the system.
Joint Compounds and Fittings
Here are some important “Do’s” and “Don’ts” regarding the
use of thread sealant:
• Do apply a thin coating of compound on male
threads of pipe joints, tubing connections, and other
system fittings.
• Don’t use any compound on O-ring, compression, or
flare fitting connections. Instead, apply a thin coat of
silicone grease to 0-rings and flares.
• Don’t use Teflon thread tape anywhere in the air sys-
tem. (Teflon tape shreds can become lodged in valv-
ing.)
• Do follow manufacturer recommended guidelines
when tightening fittings.
CAUTION