Inspection and Servicing of Generator Set. Refer to Service Upon Receipt of Materiel in TM 5-6115-
465-12 for initial inspection and servicing procedures.
Inspection and Servicing of Trailer. Refer to Service Upon Receipt of Materiel in TM 9-2330-247-
14&P for initial inspection servicing procedures.
4-2. Installation. (See figure 4-2.). The field configuration of the PU-789/M involves the use of two
interconnected power units-a primary unit and a standby unit. Therefore, installation involves positioning both
trailers, grounding both power units and interconnecting both power units.
Positioning Power Unit. Position each power unit on the work site as follows:
Select an area as level as possible to install power unit and position trailer.
Set trailer handbrakes.
Remove all cables from storage tray on primary power unit.
On standby power unit, disconnect P3 power/control cable from J3 on adapter plate assembly.
Install protector cap on cable connector P3.
Do not operate generator set until power unit is properly grounded (paragraph 4-2,
b.). Serious injury or death by electrocution can result from operating an
ungrounded power unit.
Hazardous electrical voltage exists within system. Do not connect or disconnect
cables while generator set power is ON.
Do not drop or drag connectors on hard surface or connectors may be damaged.
Connect P10 connector on auxiliary cable to J10 on primary power unit PDU. Connect P11 on
auxiliary cable to J3 on standby power unit adapter plate assembly
Power/control cable weighs approximately 180 pounds (81 72 kg). Do not attempt
to carry cable without assistance or personal injury may result.
Connect P1 connector on 75-foot power/control cable to J1 on PDU. Connect P2 on cable to
J2 on ICC or CRG.
Connect P6 connector on control cable to J6 on PDU. Connect P5 on cable J5 on ICC or