Pressure Measurement; Required Tools; Port Locations And Pressure Gauge Installation; Ports And Pressure Gauges - Danfoss Series 42 Service Manual

Service Manual

Pressure Measurement

Required tools

Port locations and pressure gauge installation

Ports and pressure gauges

Series 42 Axial Piston Closed Circuit Pumps
You can perform the service procedures in this manual using common mechanic's hand-tools. Calibrate
gauges frequently to ensure accuracy. Use snubbers to protect pressure gauges.
A pump with a manual displacement control (MDC) and no filtration adapter is shown. With non-
feedback controls, the positions of the case drains may vary. With a filtration adapter, the porting in the
filtration options area varies.
Proper service and diagnosis may require pressure measurement at various points in the hydraulic circuit.
The Series 42 pump has several locations at which to take these measurements. The following illustration
shows the locations of the various gauge ports. The table shows the recommended gauge size and the
fitting size for each port. Refer to this information when installing pressure gauges.
Gauge ports
Gauge Pressure measured
port
M1 & M2 System pressure for ports A and B
M3 Charge pressure
M4 & M5 Servo pressure
L1 & L2 Case pressure
S Charge pump inlet pressure
* Some older models may use a 9/16-18 O-ring fitting.
3
28/32 cm base unit with MDC and no filtration adapter
System pressure
gauge port M2
System
pressure
port B
System
pressure
port A
System pressure
gauge port M1
LEFT SIDE VIEW
520L0638 • Rev 0300 • July 2015
Recommended gauge
size
600 bar [8700 psi]
60 bar [870 psi]
60 bar [870 psi]
35 bar [510 psi]
1 bar [30 in Hg vacuum]
Servo pressure
gauge port M5
Servo pressure
gauge port M4
Case drain
port L1
Case Drain
Port L2
RIGHT SIDE VIEW
O-ring boss
28/32 cc 41 / 51 cc
9/16/-18 9/16/-18
3/4-16 * 3/4-16 *
9/16-18 9/16-18
1-1/16-12 1-5/16-12
1-1/16-12 1-5/16-12
Charge pressure
gauge port M3
(charge pressure
supply for no
charge pump
option)
Charge pump
inlet port S
P108 067E
23