You are replenishing the hydraulic system
with oil, what should you use to strain
the oil? 1.
A cheese cloth
2. An aluminum filter
A 200-mesh wire
A 400-mesh wire screen
If you are filling a hydraulic system and
notice water in the oil, what should you
Centrifuge the oil or reject it
2. Run the
oil through a 200-mesh strainer
Heat the oil to permit the water to
Allow the oil to stand until the
water sinks to the bottom
Question 9-45 is to be judged True or
Opening the air valves to a hydraulic
system will allow any air pockets formed
in the unit to vent into the oil expan-
9-46. What type of material is used to
form the shaft seal of most modern
condition can cause the packing of a
shaft stuffing box to wear out quickly?
Excessive packing 9-48.
What is the main purpose of packing a
shaft packing gland uniformly and
1. To allow
for cooling and lubrication 2.
To prevent scoring of the shaft
3. Roth 1 and
2 above 4.
To prevent binding of the shaft
that a routine inspection reveals a
leak in the line of a hydraulic system
at a flanged joint. If the leak persists
after the bolts have been tightened
evenly, what will be the proper correc-
tive procedure to follow next?
1. Replace the flanges
Install new packing
Inspect the fluid for contaminants
Install square-braided asbestos
How should you cut out an auxiliary line
of a hydraulic system if you want the
rest of the system to continue to
Close the valves of the ram cylinder
2. Cut in a
new pump 3.
Cut out the three-way valve
4. Valve off
the line from the connection to
the main line Questions 9-51 and
9-52 are to be judged True or False.
three-way valve in a hydraulic gear
installation may be used to shift from
the operating pump to a standby pump.
Replenishing lines installed to hydraulic
systems of older ships are a source of
leakage troubles because pressures are in
excess of 300 psi.
9-53. The relief valves in a
hydraulic system leak. What should you
do to the valve seats?
Replace them 3.
4. Fit them with seat
Which of the following steps should you
take to correct an inoperative shuttle
the oil supply 2.
Secure the expansion tank
Adjust the valve to allow more liquid
to flow through
4. Close the stop valves and
remove the valve for repairs