Charge Pressure Test (Using Pressure Gauge)
A charge pressure test should be performed to identify
if a worn or damaged hydrostatic transmission is caus-
ing a hydraulic system problem.
11.The pressure should drop no more than 15% from
initial test reading (Step 8 above). A pressure drop of
more than 15% may indicate a traction circuit leak (e.g.
check valve not seating, worn or damaged hydrostat).
NOTE: Before conducting charge pressure test, deter-
mine counterbalance pressure setting for the machine
(see Traction Unit Operator’s Manual).
If charge pressure drop is more than 15%, inspect the
condition of the charge pump gerotor and internal hous-
ing (See Charge Pump Service in the Sauer--Danfoss
(Sundstrand)15SeriesServiceManualattheendofthis
chapter).
1.
Make sure hydraulic oil is at normal operating tem-
perature.
2.
Parkmachineonalevelsurfacewiththecuttingdeck
If the charge pump is in good condition (no scoring,
scratches or excessive wear), the general condition of
the transmission’s piston pump and piston motor might
be suspected of wear and inefficiency.
(or implement) lowered and P.T.O. switch off. Make sure
engine is off. Set the parking brake and block the front
wheels to prevent machine movement.
3.
Read Precautions For Hydraulic Testing.
12.Disconnect
pressure gauge from the transmission.
Install pipe plug back in the transmission. Check hy-
draulic oil level in reservoir (front axle).
CAUTION
3
Before opening hydraulic system, operate all
hydraulic controls to relieve system pressure
and avoid injury from pressurized hydraulic oil.
4.
Thoroughly clean the area around the 1/8 inch pipe
2
2
plug located on the top of the transmission between the
two check valves (Figs. 16 and 17). Remove the plug
from the transmission.
1
5.
Connect a 1000 PSI (70 Bar) hydraulic pressure
gauge to the transmission opening.
Figure 16
1.
2.
Seat base opening
Check valve
3.
Pipe plug
6.
at idle speed. Check for any hydraulic leakage from test
connections and correct before proceeding with test.
After installing pressure gauge, start engine and run
7.
tachometer to verify that engine speed is correct.
Run engine at full speed (3200 + 50 RPM). Use a
PIPE
PLUG
FRONT
8.
should be approximately the same as counterbalance
pressure.
Observe pressure gauge. The pressure reading
9.
Turn off machine. Record test results.
10.Perform
a dynamic charge pressure test to identify
possiblehydrostat(pumpormotor)problemsasfollows:
A. With pressure gauge still connected, sit in the op-
erator seat, start engine and press the traction pedal
to forward.
Figure 17
B. While machine is moving straight ahead on level
ground (no turning or deck lifting), monitor the pres-
sure reading on the pressure guage. Record test re-
sults.
Hydraulic System
Page 5 -- 20 Rev. A
Groundsmaster 3280--D/3320
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