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HY28-2668-01/GC/NA,EU
GOLD CUP
®
Series - Application Manual
Piston Pumps & Motors
3.9
Parker Hannifin Corporation
Hydraulic Pump Division
Marysville, Ohio USA
Section 3
The automatic brake and bypass control is used in circuits which cannot tolerate creeping of
the actuator or motor when the pump is in the neutral position. It is intended primarily for use
in hydrostatic transmissions, but is usable in other type circuits. The control will relieve servo
pressure from the brake port in order to allow a springset brake to set, and opens a bypass
across both work ports to prevent any buildup of pressure differential across them. For the
above conditions to be met, both the rotary servo input and the rocker cam must be simulta-
neously in the neutral position. If the input rotary servo and the rocker cam are not coincident
in the neutral position, pressure is maintained on the pressure released brake and the bypass
between the system ports remains blocked.
AUTOMATIC BRAKE AND
NEUTRAL BYPASS CONTROL
Figure 3.12
Automatic brake and neutral bypass
control 400 and 500 series
(input and output at zero stroke)
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