ORGANIZATIONAL MAINTENANCE OF THE HYDRAULIC SYSTEM
j. Thread filter housing onto head hand tight
and secure with lockwire.
The hydraulic system is used on MEP-104A Pre-
k. Connect return line to hydraulic actuator
cise Generator Sets only. It's function is to
unit and fill hydraulic smp as directed in para-
provide a means of precise frequency control.
The system consists of a sump, a replaceable ele-
ment type filter, a gear driven positive dis-
placement type pump, a pressure relief valve, a
hydraulic actuator and interconnecting lines.
No maintenance is required on the pres-
The actuator hydraulically operates the governor
control linkage to change the governor setting.
sure relief valve. If the valve is dam-
aged or fails to relieve pressure, replace
Changing the governor setting increases or de-
creases the engine speed causing a corresponding
increase or decrease in generator output fre-
HYDRAULIC ACTUATOR UNIT FILTER.
HYDRAULIC SUMP AND FILTER.
a. Disconnect hydraulic hose assembly (figure
a. Disconnect return line from hydraulic
Remove elbow, adapter, and filter.
actuator unit and allow the oil to drain into a
filter with dry cleaning solvent
(Fedaral Speci fication P-D-680) and dry
Drain oil while it is at operating tem-
perature to insure maximum suspension
d. Inspect filter for holes, tears, and other
damage. Replace filter if defects are noted.
b. Remove lockwire and unscrew filter housing
Install filter and elbow.
from filter head.
Install hydraulic hose.
Withdraw filter elenent and discard.
d. Remove and discard packing and back-up
Removal. Drain hydraulic system (see
lines by following the ascending numerical
Clean filter housing with dry cleaning sol-
sequence of index numbers (1 through 16) assigned
vent (Federal Specification P-D-680) and dry with
filtered canpressed air.
f. Soak replacement filter elanent in oil con-
forming to Military Specification MIL-H-5606.
It is not necessary to renove all hydraulic
lines to replace a single part. Only those
Install replacement packing and back-up
hydraulic lines requiring replacement need
h. Insert oil soaked filter elenent into fil-
ter housing and fill housing with clean oil.
i. Apply a thin coating of oil to packing,
back-up ring, and threads of filter head and