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

Service Manual
G1, G2, G7

Operation

Repair

Series 51 Two Position Controls Service Manual

Functional Description

The G* two-position controls consist of a ported housing that contains a four-way, 2-position, solenoid
operated cartridge valve. A seal plug is installed in the four-way valve cavity in the motor's endcap. The
control contains a loop-flushing shuttle valve and relief valve. The loop-flushing and four-way valve
components normally found in the motor's endcap are not used with G* controls. A special endcap is
used with the G* controls.
The loop-flushing shuttle valve resolves which port, system A or system B, is at a lower pressure. It then
routes low-loop pressure to the loop-flushing relief valve and to the solenoid operated cartridge valve.
The loop-flushing relief valve allows fluid to pass out of the working loop into the motor's case for
cooling and contamination removal.
When energized, the solenoid valve routes low loop pressure to the minimum displacement end of the
servo piston while draining the maximum displacement end to motor case, shifting the motor to
minimum displacement. When de-energized, the valve routes low loop pressure to the maximum
displacement end of the servo, while draining the minimum displacement end. Orifices at locations T1,
T2, and T3 control shift speed.
G* controls solenoid details
Type Sol. on
G 1 min.
2 min.
7 min.
Schematic diagram
T1 T2
M5
X
T3
Solenoid (M1) is available as a complete assembly only. Do not remove the valve unless you plan to
replace it.
11009442 • Rev CA • January 2015
Sol.off Volts
max. 12
max. 24
max. 12
L2 M4 M3
X X X
M1
A
X
max.
..
disp
L1
M2
X
B
P101 213
Connector
DIN 46350
DIN 46350
Jet Junior Timer
35