Copyright Goodheart-Willcox Co., Inc.
156 Hydraulic Systems for Mobile Equipment
24. A piston seal is being installed; the service
manual states to heat the seal prior to
installation. What method is used to heat
the seal?
A. Butane torch.
B. Acetylene torch.
C. Heat gun.
D. Hot water.
25. Technician A states that pipe wrenches are
sometimes used to remove a cylinder’s gland.
Technician B states spanner wrenches should
never be used to remove cylinder glands.
Who is correct?
A. Technician A.
B. Technician B.
C. Both A and B.
D. Neither A nor B.
26. Prior to assembly of a rebuilt cylinder, what
should be used to machine the cylinder’s
barrel?
A. 1000-grit sandpaper.
B. Emery cloth.
C. Flex hone.
D. Die grinder.
27. External aluminum clamp-on stops are
commonly used in what application?
A. Motor graders.
B. Backhoes.
C. Agricultural implements.
D. Agricultural combines.
28. A cylinder with a five-centimeter diameter
is receiving 30 lpm. What is the cylinder’s
extension speed?
A. 0.255 m/sec
B. 0.355 m/sec
C. 0.455 m/sec
D. 0.555 m/sec
29. Rephasing relief valves are used in what type
of cylinder circuit?
A. Cylinders in series.
B. Cylinders in parallel.
C. Both A and B.
D. Neither A nor B.
30. Rephasing orifices are used in what type of
cylinder circuit?
A. Cylinders in series.
B. Cylinders in parallel.
C. Both A and B.
D. Neither A nor B.