Required tools
You can perform the service procedures described in this manual using common mechanic’s tools.
Special tools, if required are shown. Use calibrated pressure gauges to ensure accuracy. Use snubbers to
protect pressure gauges.
Port locations and gauge installation
The following sections list the ports for each type of hydraulic unit. The fitting size and recommended
pressure gauge are also specified.
The following table and drawings show the port locations and gauge sizes needed.
Port information
Port identifier
Pressure obtained
Gauge size
Port size
M1, M2
System pressure
1000 bar [10 000 psi]
9/16-18
M3 (M6)
Charge pressure
50 bar [1000 psi]
9/16-18
M4, M5
Servo pressure
50 bar [1000 psi]
9/16-18
L1, L2
Case pressure
10 bar [100 psi]
055-100
1-1/16-12
X1, X2
HDC/EDC control pressure
50 bar [1000 psi]
9/16-18
X3
External control pressure
50 bar [1000 psi]
9/16-18
S
Charge pump inlet
Vacuum gauge,
Tee into inlet line
055-075
1-5/16-12
100
1-5/8-12
Pump with side port end cap and manual displacement control
Servo / displacement
cylinder pressure
gauge port
M5
Servo / displacement
cylinder pressure
gauge port
M4
Case drain
port
L1
System pressure
port
B
External control pressure
supply port
X3
Charge pressure
gauge port
M3
Speed sensor
P106 158E
System pressure
gauge port
M2
System pressure
gauge port
M1
System pressure
port
A
Case drain port
L2
Carge pump
inlet port
S
Charge inlet pressure
(vacuum)
Service Manual
Series T90 Axial Piston Pumps
Pressure measurement
24 |
©
Danfoss | March 2020
AX216086485386en-000101