TEST NO. 4: Charge Pump Flow and Implement Relief Pressure (Fig. 11)
Using a hydraulic tester with flow meter
If adding shims to the relief valve does not increase the
pressure, inspect the condition of the charge pump
gerotor and internal housing.
1.
Engage the parking brake and block the front wheels
to prevent movement of the machine. Lower the cutting
unit or implement to the floor and turn the engine OFF.
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.
2.
Raise and support the seat or remove the seat and
seat mounting plate.
3.
the hydraulic hose from the charge pump outlet (pres•
sure) fitting on the transmission.
Put a drain pan below the transmission. Disconnect
A lack of sufficient implement pressure could be due to
the fact that the charge pump is having to direct most of
its flow to the main traction circuit (piston pump and
piston motor). When this occurs, oil pressure may not
increaseto the700 - 800psipressurenecessary toraise
the heavy implement.
4.
the transmission. Connect the tester outlet hose to the
hose that was disconnected in step 3.
Connect the inlet hose of the tester to the fitting on
At this point, a traction pressure test could be used to
determine whether the hydrostatic transmission has
excessive piston group leakage and needs to be
repaired. (See Traction Pressure Test.)
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow gauge is showing that the oil will
flow through the tester from the pump to the steer•
ing valve.
5.
Make sure that the tester load valve is fully open
(counterclockwise). Start the engine and allow it to run
for approximately 5 minutes so that the hydraulic oil
reaches normal operating temperature.
6.
Increase the engine speed to the FULLthrottle setting
and use a tachometer to verify that the engine is running
at 3200 ± 50 rpm.
7.
While watching the flow and pressure gauges, slowly
close the flow control valve (load valve) until the flow
gauge reads 1.0 GPM.
8.
If the pressure is below 700 psi or 1.0 GPM could not
be achieved, adjust the implement relief valveby adding
the required amount of shims from the shim pack.
CAUTION
The implement relief pressure must not ex•
ceed 800 psi.
Figure 11
1.
2.
3.
Transmission
Tester
Load valve
Testing
Page 5 - 22
Groundsmaster® 300 Series
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 300, Toro Groundsmaster 328 D, Toro Groundsmaster 92801SL |
| Download File |
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| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
(2 votes, average: 5 out of 5)
Lawn and Garden readers have rated Toro 92801SL Rev I Groundsmaster 300 Series Groundsmaster 328 D Service Manual 5.0 out of 5.0 based on 2 product reviews. Need 328D. Manual pdf. Will rate after finding manual
t has been a very reliable machine but getting parts is hard and not cheap to buy , generic parts has been cost effective and reliable , i am unable to get a wiring circut diagram for this unit as most problems are electrical problems