Four-Way Selector Valve
A three-position, four-way selector valve (Figure 19) is installed in the auxiliary hydraulic system to control the rotation of the
refuel pump and motor. The four-way selector valve is mounted on the right rear area above the track in the engine compartment.
Figure 19. Four-Way Selector Valve--Installed View.
AUXILIARY POWER UNIT (APU)
The APU (Figure 20) consists of an air cooled diesel engine with a chain case, generator (which is also used as a starter), and
hydraulic pump mounted to it. The chain case covers three sprockets and a drive chain, With a support and mounts, the engine,
generator/starter and pump form a compact unit which fits into the right forward corner of the vehicle engine compartment. The
generator electrical system is designed to supply a maximum of approximately 150 amperes of current at approximately 28 volts
dc to charge the vehicle batteries. The pump supplies pressure at 2000 50 psi (13,790 345 kPa) to the auxiliary hydraulic