2-14. POWER TRANSFER CASE (Continued).
LOCKUP CHAMBER. When air pressure is applied to the chamber, it mechanically locks the
rear axle differential in place so that drive is applied to both rear axles. Without air pressure,
the differential applies drive to the axle that offers the least resistance.
DRAIN PLUGS. Allow draining oil during service intervals. Has magnetic base to attract
foreign particles and warn of unusual wear of internal parts.
FILLER PLUGS. Provide means of checking and replenishing oil supply.
LOCKUP SWITCH. Normally open; closed by 60 psi air pressure to activate lockup indicator