SYSTEM OPERATION (see Figure 3)
Controlled Converters
CHARGE PRESSURE
NOTE The following description of operation is for
cranes with two converters. Operation for cranes
and hoists with one converter is identical.
Charge pump (1) draws oil from tank (2) through suction
screen (3). The oil flows through pump (1) and filter (4)
and enters end plate (5) at each converter. The oil fills
the converters, flows out the top of each turbine housing
(6) and returns to oil tank (2) through orifice filters (7).
Orifice filters (7) serve three purposes: filter oil returned
to oil tank (2), vent air from thesystem, and help main-
tain charge pressure.
Depending on engine speed, charge pressure will range
between 45-65 psi. Maximum charge pressure is limited
by a relief valve in charge pump (1). Pressure is shown
on a gauge in the operator's cab and on some cranes at
the converter.
COOLING
The internal pumping action of each converter causes
oil to flow out each yoke housing (8) and each turbine
housing (6). The oil then flows through the heat
exchangers where it is cooled and returns to each end
plate (5).
The temperature of the converter oil will range between
160-225°F. A temperature gauge for each converter is
mounted in the operator's cab and on some cranes at the
converters.
Temperature switches (9) are wired to a buzzer and red
I.ight in the operator's cab. The switches will close and
the buzzer and red light will come on when the converter
oil temperature rises to 270 ° F.
Stop engine tempera-
i! converter
oil
ture rises to 270°F or damage
will
result. Correct cause for overheating betore continuing
with operation.
NOTE It is normal for the light and buzzer to come on for
a few seconds when starting or stopping the
engine but they should turn off when proper oil
pressure is reached.
Non-Controlled Converters
CHARGE PRESSURE
Each charge pump (1) draws fuel oil from the fuel tank
through sediment bowl filter (10). The fuel oil flows
through pumps (1) and filters (4) and enters end plate (5)
at each converter, The fuel oil fills the converters, flows
out the top of each turbine housing (6), and returns to
the fuel tank through orifice filters (7).
Orifice filters (7) serve three purposes: filter oil returned
to the fuel tank, vent air from the system, and help
maintain charge pressure.
Depending on engine speed, charge pressure will range
between 45-65 psi. Maximum charge pressure is limited
by a relief valve in charge pump (1). Pressure is shown
on gauges in the operator's cab and on some cranes at
the converter.
COOLING
The cooling system for non-controlled converters oper-
ates identically to the cooling system for controlled
converters.
(Continued)
FOLIO
941-2
395143
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