Symptoms:

  • Shift concerns
  • UD/B3 Clutches burned

Cause:

The B3 orifice control valve often sticks in the casting bore, preventing proper stroking of the valve and flow control to the UD/B3 brake.

Correction:

Recondition the valve bore and install Sonnax oversized B3 orifice control valve and spring to prevent future sticking issues.
  • U151E, U151F, U250E Oversized B3 Orifice Control Valve Kit 27741-16K
  • U151E, U151F, U250E Oversized B3 Orifice Control Valve Kit 27741-16K

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

U151E, U151F, U250E Oversized B3 Orifice Control Valve Kit Vacuum Test Locations