Series 51 Hydraulic Proportional Controls HZ, HA ... - Sauer-Danfoss
Series 51 Hydraulic Proportional Controls HZ, HA ... - Sauer-Danfoss
Series 51 Hydraulic Proportional Controls HZ, HA ... - Sauer-Danfoss
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<strong>Series</strong> <strong>51</strong> <strong>Hydraulic</strong> <strong>Proportional</strong> <strong>Controls</strong><br />
Service Manual<br />
JA Control<br />
Operation Functional Description<br />
JA control is a stand-alone, dual signal hydraulic proportional control. The control<br />
housing contains a pressure compensating override (PCOR) valve, a brake pressure<br />
defeat (BPD) valve, and passages to route oil to the 4-way valve and to the servo piston<br />
ends. An external servo supply pressure fed to port M5 is required. A threshold spring<br />
and ramp spring(s) act on the opposite end of the 4-way valve.<br />
Signal Pressure<br />
Separate external variable signal pressures are fed into ports XA or XB. The BPD spool<br />
resolves which signal pressure is higher and routes this signal pressure to the end of the<br />
4-way valve. The signal pressure shifts the 4-way valve and it ports servo supply pressure<br />
to the ends of the servo piston, changing motor displacement in proportion to the signal<br />
pressure.<br />
JA Control Schematic Diagram<br />
BPD<br />
PCOR<br />
11009446 • Rev AC • November 2010<br />
XB XA A<br />
U7<br />
T4<br />
T6<br />
B<br />
Loop flush<br />
L2 M4 M3 N<br />
T2 T3<br />
T1<br />
max.<br />
disp.<br />
T7 T8<br />
n<br />
M1<br />
L1<br />
(M5)<br />
X3<br />
M2<br />
P106 420E<br />
37
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