2-10
PRESSURE TESTS 2.5
The following photos show the various port locations
available on the hydrostatic tandem pump for checking
system pressure.
Completing these pressure tests will diagnose any
mechanical problem in the hydrostatic system.
Installing a gauge into the system gauge port ‘A’ , ‘B’ ,
‘C’ or ‘D’ will verify the status of the high pressure relief
valves.
Checking the pressure at port ‘E’ will give accurate
charge pressure reading. The charge pressure can also be
obtained by placing a gauge on the quick coupler in the
engine compartment. (fig C4258)
Checking the pressure at port ‘F’ will verify case drain
pressure.
Gauge Information
A
B
E
F
System
Pressure
Gauge
System
Pressure
Gauge
Charge
Pressure
Inlet Port
Case
Drain
Port
10,000 psi gauge (690 bar)
9/16 - 18 O-Ring Fitting
10,000 psi gauge (690 bar)
9/16 - O-Ring Fitting
500 psi Gauge (34.5 bar)
7/8 - 14 O-Ring fitting
500 psi Gauge (34.5 bar)
1 - 1/16 - 12 O-Ring Fitting
C4257
C4258
WARNING
Use caution when dealing with hydraulic fluid under
pressure. Escaping fluid under pressure can pene-
trate the skin and cause serious injury.
Tandem pump flow can also measure pump performance.
1 Connect a flow meter between the high pressure
ports, one section at a time.
2 Start the engine and increase operating speed
between 1775 ~ 1800 rpm.
3 Restrict the flow to show 2000 psi (137.8 bar) over
charge pressure inlet.
Example: Charge pressure = 220 psi (15.2 bar) Gauge
pressure reading would need to be 2220 psi (153 bar).
4 Minimum flow reading should be 13.5 gal / min. (51
l / min).
WARNING
Raise the machine securely from the ground before
performing system checks to prevent sudden move-
ment.
NOTE: Without Internal charge pump model shown
LH Side And Top View
RH Side and Bottom View
D
C
Port APort C
Port D Port B
F
High pressure relief valves D and B
Gauge port B
High pressure relief valves A and C
Gauge port C
Charge pressure relief valve
E
Gauge port D
Gauge port A
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