(3) Use fully charged batteries and take readings at
g. Visually check for excessive vibration while the
cranking speed (150 to 200 RPM).
(4) Do not operate starter more than 15 seconds at
a time to prevent overheating of starter. Allow one (1)
minute between cranking cycles to allow starter to cool,
i. Repeat d through g above.
(5) Readings on the gage can be used as reference
between cylinders. Maximum pressure difference be-
k. If any abnormalities were noted during test opera-
tween cylinders is 20 percent. An extremely low reading
tion, refer to table 3-2 for reference to the applicable
in any one cylinder would indicate valve, head gasket
or piston ring blow-by.
l. Test cylinder compression pressure as follows.
(1) Disconnect fuel pump solenoid (pump will be in
tion nozzle holders.
off position and will not pump fuel).
tion nozzle holders.
Section XV. ORGANIZATIONAL MAINTENANCE OF THE GENERATOR SET
a. Oil Pressure Gauge.
This paragraph contains organizational maintenance
instructions for the generator set controls. The control
cubicle assembly and the fault locator panel contain the
(a) Tag and remove electrical leads to oil
controls, instruments, and indicators for controlling
and monitoring the operation of the generator set. The
400 Hz and 50/60 Hz tactical precise models incorpor-
and clamp 3.
ate a governor control unit which operates the hydrau-
lic actuator to change the governor setting. This func-
(c) Remove oil pressure gauge (4) from panel.
tion is fulfilled by the manual speed control on the
(2) Inspection and cleaning.
tactical utility model. The interconnecting wiring
(a) Clean oil pressure gauge with filtered com-
harness provides electrical connection between the ma-
pressed air and a soft bristle brush or wipe with a clean,
jor assemblies and the control cubicle and fault in-
lint-free cloth lightly moistened with an approved sol-
3-112. Control Cubicle Assembly
(b) Visually inspect oil pressure gauge for corro-
sion, cracked casing, cracked or broken glass, stripped
or otherwise ciamaged threads, and evidence of other
The generator shall be shut off the the bat-
tery disconnected prior to performing main-
tenance on the control cubicle assembly.
Failure to observe this warning may result
in electrical shock or death by electrocution.
(b) Adjust rheostat until multimeter indicates 30
Access to the interior of the control cubicle
assembly is obtained by loosening three
fasteners at the top of the panel and swing-
ing the panel forward on the hinge at its low-
(d) Connect rheostat to terminal of oil pressure
er side until its weight is supported by the
gauge marked SEND.