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f:tec\manuals\Service\SERVICEv5.indd - V6-0615
SERVICE MANUAL
TIREBOSS
TM
Tire Pressure Control
Rotary Union Maintenance Instructions
Testing Rotary Unions For Excessive Wear or Leaks - Weekly
With the wheel valves open, move rotary union up and down and spray base with soapy water. Excessively
worn or leaking unions should be replaced. Note that some movement is normal and excessive would be a
union that is leaking air when moved.
NOTE: Short Rotary Unions used on wheel ends do not have grease fi ttings and do not require
greasing.
Longer Rotary Unions have grease fi ttings in the side of the body. Regular greasing will optimize
the operation and life of the Rotary Unions.
Basic Guidelines for Greasing
AMOUNT OF GREASE
Re-lubricate sparingly, only enough grease should be applied (one pump) to replace that grease
which has been dissipated.
!!! Over-greasing can damage the Rotary Union Seal!!!
!!! Do not use power greasers !!!
TYPE OF GREASE
We recommend the Greaseable Rotary Unions be serviced with premium, aluminium complex grease that
is fortifi ed with extreme pressure and anti wear additives. The grease should be tacky, have excellent water
resistance, and have an extremely high dropping point (260o C) A recommended grease available direct
from TIREBOSS is “Nemco Red Max EP1.5”
FREQUENCY
NOTE: All Rotary Unions that are internal on Trailer and non-driven Steer axles do not require
greasing.
Operating on roads that are
frequently salted, sanded or
calcium applied
Operating on clean and clear
roads
Every 2,500 km
or 1,500 miles
Every 5,000 km
or 3,000 miles
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