Occasionally No 4-3 or 3-2 Selector Lever Downshift

CAUSE/REMEDY:
1. Drive vehicle with control pressure cable disconnected. If in order, check of control pressure cable and engine throttle control and adjust if necessary.
2. Check freedom of movement of Shift valve deceleration shift (55) or Shut-off valve Rv1 (62) (for illustration see Location of Components). Location of Components