Sauer-Danfoss series S90 axial piston pumps
Sauer-Danfoss series S90 axial piston pumps
Sauer-Danfoss series S90 axial piston pumps
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- axial
- piston
- pumps
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muLti-funCtion vaLves<br />
(continued)<br />
M<br />
M1<br />
M4<br />
M5<br />
M2<br />
S<br />
Series 90 Axial Piston Pumps<br />
Technical Information<br />
Features and options<br />
18 520L0603 • Rev FC • August 2008<br />
Multifunction valve, pressure limiter, pressure regulation, option 1<br />
M3<br />
L2<br />
A<br />
B<br />
Servo <strong>piston</strong><br />
Port A<br />
Port B<br />
Servo <strong>piston</strong><br />
To control<br />
Servo pressure<br />
relief valves<br />
Multifunction valve<br />
Multifunction valve<br />
Charge<br />
pressure<br />
relief valve<br />
bypass function<br />
In some applications it is desirable to bypass fluid around the variable displacement<br />
pump when pump shaft rotation is either not possible or not desired. For example, an<br />
inoperable vehicle may be moved to a service or repair location or winched onto a trailer<br />
without operating the prime mover. To provide for this, Series 90 <strong>pumps</strong> are designed<br />
with a bypass function.<br />
The bypass is operated by mechanically rotating the bypass hex on both multifunction<br />
valves three (3) turns counterclockwise (CCW). This connects working loop A and B and<br />
allows fluid to circulate without rotating the pump and prime mover.<br />
C Caution<br />
Possible pump and/or motor damage<br />
Bypass valves are intended for moving a machine or vehicle for very short distances at<br />
very slow speeds. They are NOT intended as tow valves.<br />
A<br />
B<br />
C<br />
Bypass hex<br />
adjustment<br />
P102 007E
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