TEST NO. 2: Traction Circuit Charge Pressure
1.
Hydraulic oil must be at operating temperature.
Deck drive test ports on newer models at deck motor.
Older model shown.
2.
Connect a 1,000 psi gauge onto charge pressure test
port (Fig. 10).
3.
Start the engine and put throttle at idle position
(approx. 1,200 rpm) with no load on the system.
TESTER READING TO BE:
Figure 10
230
285
± 10 PSI (Pump S/N Below A-96-01-XXXXX)
± 10 PSI (Pump S/N A-96-01-XXXXX & Up)
4.
If there is no pressure or pressure is too low, check
for restriction in pump intake line. Inspect charge relief
valve and valve seat. Charge pressure can be adjusted
by changing shim thickness behind the spring. Check
for sheared charge pump key. If necessary, check
for internal damage or worn parts in charge pump.
Figure 10
5.
Alsowith pressure gauge still connected to the charge
pressure test port, take a gauge readingwhile operating
the machine in forward and reverse. Start the engine and
put the throttle at full engine speed. Apply thebrakes and
push the traction pedal forward , then reverse.
6.
If pressure is goodunder no load,but dropsbelow
specificationwhenunder traction load, the piston pump
and/or traction motor(s) shouldbe suspected ofwear and
inefficiency. When the pump and/or traction motor(s) are
worn or damaged, the charge pump is not able to keep
upwith internal leakage in the traction circuit
components.
Groundsmaster® 580-D
Page 4 - 25 Rev. E
Testing
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