c. Installation.
e. The control hose is high pressure double wire
(1) Fill hose with hydraulic oil.
braid hydraulic hose. Care should be exercised
(2) Install hydraulic hose as illustrated in
when handling this hose. If it is allowed to catch
on the leads in any way and stretched high pres-
sure can be built up inside the hose. The stretch-
3-24. Receiver
ing of the hose reduces its inside diameter causing
a build-up of pressure resulting in damage to the
a. Removal. Remove the hydraulic receiver as
control hose, or other parts of the control system.
illustrated in figure 3-9.
A self-sealing coupling, located on the hammer,
b. Cleaning and Inspection.
permits removal of the hose without losing oil
(1) Clean receiver with an approved clean-
pressure and prevents admission of air into the
ing solvent and dry thoroughly.
system while transporting the hammer.
(2) Inspect for breaks, cracks, or other dam-
f. The receiver is a cylinder with a spring
age. Replace a damaged or defective receiver.
loaded piston which is mounted on the hammer.
c. Installation.
The control hose is attached to the side of the
(1) Fill receiver with hydraulic oil.
cylinder. As the piston is extended by a column
(2) Install receiver as illustrated in figure
of oil moving through the control hose, it moves
3-9. Bleed hydraulic system (para 2-9).
a bell-crank which in turn opens the fuel rack on
the fuel pump.
3-25. Transmitter
g. When installation of the receiver is made,
clearance between the bell-crank and fuel rack
and double relief valve as illustrated in figure
should be kept to a minimum so movement of the
fuel pump rack is positive as soon as the trans-
transmitter.
mitter lever is moved to the ON position and,
also, to utilize the full available stroke of the re-
b. Cleaning and Inspection.
ceiver piston. Shims can be added or removed
(1) Clean transmitter with an approved sol-
between the receiver cylinder casing and the
vent and dry thoroughly.
receiver mounting bracket to vary the clearance
(2) Inspect transmitter for cracks, breaks,
between the receiver bell-crank and control rack
or other damage. Replace a defective transmitter.
when installation is made. The clearance between
component parts should be kept at a minimum
3-26. Relief Valve
to compensate for normal wear. To reduce the
a. Removal. Remove the hydraulic relief valve
clearance between component parts, remove shims
as illustrated in figure 3-10.
from beneath the receiver.
b. Cleaning and Inspection.
h. The oil used in the control system conforms
(1) Clean relief valve with an approved sol-
to the specifications of MIL-H-5606.
vent and dry thoroughly.
(2) Inspect relief valve for cracks, breaks,
3-23. Hydraulic Hose
or other damage. Replace a defective relief valve.
a. Removal. Remove hydraulic hose as illus-
c. Installation.
trated in figure 3-9.
(1) Fill transmitter and relief valve with
b. Cleaning and Inspection.
hydraulic oil.
(1) Clean hose and connections in an ap-
(2) Install hydraulic transmitter and relief
proved cleaning solvent and dry thoroughly.
valve as illustrated in figure 3-10, taking care
that hose and relief valve stay full of oil during
(2) Inspect all connections and hose for
installation.
cracks, breaks, or other damage. Replace dam-
(3) Bleed hydraulic system (para 2-9).
aged or defective parts.
Section IX. STARTING DEVICE
latching block. A wire rope is connected to the
3-27. General
housing and extends upward through two guide
The starting device consists of a lifting lever,
rollers mounted on the cylinder head.
locking lever and linkage, a release lever, and a
3-9
