caution - Toro
caution - Toro
caution - Toro
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Procedure for Steering and Lift/Lower Gear Pump<br />
Flow Test<br />
Output from the steering and lift/lower gear pump section<br />
is equally divided by a proportional valve to provide<br />
flow to the steering circuit and the lift circuit. To test gear<br />
pump flow, testing of both steering and lift/lower circuits<br />
is required. Total gear pump flow is the combined flow<br />
from the two circuits.<br />
1. Make sure hydraulic oil is at normal operating temperature<br />
by operating the machine for approximately 10<br />
minutes. Make sure the hydraulic tank is full.<br />
2. Park machine on a level surface with the cutting deck<br />
lowered and off. Make sure engine is off and the parking<br />
brake is engaged. Raise seat.<br />
CAUTION<br />
Prevent personal injury and/or damage to equipment.<br />
Read all WARNINGS, CAUTIONS and Pre<strong>caution</strong>s<br />
for Hydraulic Testing at the beginning<br />
of this section.<br />
5. Start the engine and move throttle to full speed (2870<br />
RPM). DO NOT engage the cutting deck.<br />
6. While watching pressure gauges, slowly close flow<br />
control valve until 1000 PSI (69 bar) is obtained on<br />
gauge. Verify engine speed continues to be 2870 RPM.<br />
GAUGE READING TO BE: Flow approximately 7<br />
GPM (26.3 LPM) at 1000 PSI (69 bar).<br />
7. Stop engine and record test results.<br />
8. If a pressure of 1000 PSI (69 bar) could not be obtained<br />
or flow is lower than 6GPM(22.3LPM)(85% of<br />
expected flow), check for restriction in pump intake line.<br />
If intake line is not restricted, consider that gear pump is<br />
worn or damaged.<br />
9. When testing is complete, remove tester and reconnect<br />
hose to pump fitting.<br />
2<br />
3<br />
Hydraulic<br />
System<br />
IMPORTANT: Make sure that the oil flow indicator<br />
arrow on the flow gauge is showing that the oil will<br />
flow from the pump section, through the tester and<br />
into the hydraulic hose.<br />
3. With the engine off and cutting deck lowered, disconnect<br />
the hydraulic hose from the 90 o fitting in the third<br />
gear pump section which supplies the steering and lift/<br />
lower circuits (Fig. 43).<br />
4. Install tester in series between the fitting and the disconnected<br />
hose. Make sure the tester flow control valve<br />
is OPEN.<br />
IMPORTANT: The pump is a positive displacement<br />
type. If pump flow is completely restricted or<br />
stopped, damage to the pump, tester or other components<br />
could occur.<br />
4<br />
1. Gear pump<br />
2. Fan drive manifold<br />
1<br />
Figure 43<br />
3. Steering/lift hose<br />
4. 90 o fitting<br />
Groundsmaster 4100--D<br />
Page 4 - 55<br />
Hydraulic System