TEST NO. 6: Checking Charge Pressure
1. Make sure hydraulic oil is at normal operating tem-
perature by operating machine for approximately 10
minutes.
2. Lower cutting units, engage parking brake and stop
the en
gine.
3. Install a 1,000 PSI gauge onto the charge pressure
quick disc
onnect fitting.
4. Start the engine and position throttle at high idle
(3000 RPM).
TESTER READING TO BE 100
+25
/
–10
PSI.
5. If pressure is low, inspect charge relief valve and
valve seat.
6. Also take a gauge reading while operating the ma-
chin
e in forward and reverse. Start the engine and put
the throttle at full engine RPM. Apply the brakes and
push the traction pedal forward, then reverse. If pres-
sure is good under no load, but drops below specifica-
tion when under traction load, the piston pump and/or
motor should be suspected of wear and inefficiency.
When the pump and/or motor is worn or damaged the
charge pump may not able to keep up with the internal
leakage.
1
Figure 15
1. Charge pressure test port
Hydraulic System
Groundsmaster
®
455-D
Page 4 - 25
Rev. C
Testing
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