ProcedureforTractionCircuitChargePressureTest
Make sure hydraulic oil is at normal operating tem-
2
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
1
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS, and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
Figure 14
1.
Charge pressure port
2.
Hydraulic reservoir cap
3.
test port (Fig. 14) under operator seat.
Connect a 1000 PSI gauge onto charge pressure
4.
(2730
Start the engine and put throttle at full engine speed
+ 30 RPM) with no load on the hydraulic system.
GAUGE READING TO BE 200 to 300 PSI.
5.
If there is no pressure, or pressure is low, check for
restrictioninpumpintakeline.Also,inspectchargerelief
valve located in filter manifold (see Hydraulic Manifold
Service: Filter Manifold in this chapter). If necessary,
check for internal damage or worn parts in gear pump.
6.
Also, with the pressure gauge still connected to the
charge pressure test port, take a gauge reading while
operating the machine in forward and reverse. Start the
engine and put throttle at full engine speed (2730 + 30
RPM). Apply the brakes and push the traction pedal for-
ward, then reverse.
GAUGE READING TO BE 200 to 300 PSI.
7.
If pressure is good under no load, but drops below
specification when under traction load, the piston pump
and/or traction motor(s) should be suspected of wear
and inefficiency. When the pump and/or traction mo-
tor(s) arewornordamaged, thecharge pumpis notable
to keep up with internal leakage in traction circuit com-
ponents.
Groundsmaster 4000--D
Page 4 -- 25
Hydraulic System (Rev. B)
| Categories | Lawn Mower Manual, Toro Lawn Mower Manual |
|---|---|
| Tags | Toro Groundsmaster 4000 D |
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| Document Type | Service Manual |
| Language | English |
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| Publisher | toro.com |
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