Figure 3-9. Hydraulic hose, receiver, and ransmitter, removal and installation.

hand lever which is connected with the piston as-

The bell-crank moves the rack in the fuel pump

sembly by mechanical linkage. The transmitter

to the ON position.

assures a wide range of control of the fuel in-

d. The function of the double relief valve is to

jector pump rack setting, since the positive fric-

develop a positive head in the control hose and

tion lever may be set at any desired operating

to keep the control hose full of oil, making it

position. The transmitter reservoir includes a

unnecessary to pump up pressure after the trans-

breather cap which must be opened before at-

mitter lever is returned to the OFF position, es-

tempting to start and run the hammer. If the

pecially when the receiver is located at a height

hammer is to be shut down for overnight or ex-

above the transmitter where the oil pressure

tended periods of time, or if the transmitter is to

be removed from the machine, this breather cap

head exceeds barometric pressure (in excess of

must be closed to prevent loss of control oil or

approximately 36 feet). No adjustment of the

entry of foreign material in the reservoir.

relief valve is provided. The preloaded head of

c. By moving the control lever to the ON posi-

oil in the system is maintained by springs in the

relief valve. The relief valve will maintain ap-

tion, a column of oil is moved through the double

proximately 40 psi. of hydraulic pressure in the

relief valve and then through the hose to the re-

system with control valve in either the OFF or

ceiver. As the receiver piston moves downward

out of its cylinder, it in turn moves a bell-crank.

SYNCHRONOUS positions.

Figure 3-9. Hydraulic hose, receiver, and

transmitter, removal and installation.

3-8