Hs Control; Operation; Functional Description; Repair - Danfoss 51 Series Service Manual

Service Manual

HS Control

Operation

Repair

Series 51 Hydraulic Proportional Controls Service Manual

Functional Description

The HS control consists of a ported housing mounted on a multiblock. External variable signal pressure
fed to port X1 is routed to the 4-way valve. As signal pressure shifts the 4-way valve it ports pressure to
the ends of the servo piston changing motor displacement. A threshold spring and ramp spring(s) act on
the opposite end of the 4-way valve.
HS Schematic
BPD Spool
U7
T5 U6
XA
PCOR Valve
Multiblock

Disassembly

1. Using a 4 mm internal hex wrench, remove screws (M10).
2. Remove the HS valve housing from the multifunction block.
3. Remove and discard O-ring (M12).
11009446 • Rev BA • July 2014
Shuttle
L2
A
T4
T6
XB
B
M7
Loop Flush
M4 M3
n
max.
disp.
T2 T3
T1
T7 T8
Control
X1
4-Way Valve
N
M1
L1
M5
M2
P106 417E
21