Spicer TIMS (Tire Inflation and Monitor System) for Trailers Installation Guide - Manual (Page 7)

4
Operation
Operation
Operation
System Operation
To ensure that the system is functioning, the operator should
verify that a 2 second warning lamp bulb check occurs when
the unit is powered. The system is powered from the “blue
circuit” on the 7 pin trailer connector.
Once powered, the brake supply tank must be charged before
the system will operate. The system will then pressurize the
lines and measure the tire pressure. If one or more tires are
low, the system automatically inflates the low tire(s) to the
cold tire pressure setting. The remaining tires are protected
from pressure loss by check-valves located in each tire hose.
If one or more tires are low by 10% or more, the warning
lamp will turn on and remain on until the tire(s) are reinflated.
Once the tires are at the proper pressure, the seals and hoses
will be depressurized, preventing unnecessary wear on the
seals. The system rechecks tire pressure every 10 minutes by
momentarily pressurizing the lines and measuring tire pres-
sure as described above.
If the warning lamp flashes multiple times on powerup, the
system has stored a service code and may be unable to prop-
erly check or maintain tire pressure. The operator should
manually check tire pressures to ensure that it is safe to oper-
ate the vehicle and should seek service at the next opportu-
nity.
If the warning lamp remains on, the system is attempting to
inflate the tires but may not be able to adequately maintain
proper tire pressure. The operator should stop and check the
tires to determine if it is safe to continue to operate the vehicle
and should seek service at the next opportunity.
CAUTION: All hoses must be connected for system to
operate properly. If any of the hoses are removed or
damaged, the system cannot inflate any low tire(s).
Manually Checking Tire Pressure
WARNING: To prevent injury, always wear eye protec-
tion when maintaining or servicing the vehicle.
Note: Check valves in the tire hoses prevent tire pressure loss
when a tire hose is removed. You may, however, experi-
ence air flow at the open line and a low tire indication on
the warning lamp if the tire hose is disconnected and the
system is powered.
To manually check tire pressure:
• Disconnect tire hose from tee or straight fitting at
hubcap, or disconnect from valve stem.
• Use a conventional gage to measure tire pressure at
hose end or at valve stem. See illustration below.
• Reattach and firmly hand-tighten tire hose.
CAUTION: Do not overtighten tire hose or the seal may
be damaged! Ensure tire hoses are not stretched or
rubbing on the wheel!
Tire Pressure
Gage
218UX046
Tire Hose