Procedure for Gear Pump (P2) Flow Test:
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
3. Start and run engine at full speed (2850 + 50 RPM).
1.
4. Watch the pressure gauge on the tester and move
the lift lever to the raise position. Momentarily hold the
lift lever with the cutting units fully raised causing the re-
lief valve (R5) to open. Record pressure at which the re-
lief valve (R5) opens.
2.
units lowered. Make sure engine is off and the parking
brake is engaged. Make sure the hydraulic tank is full.
Park machine on a level surface with the cutting
5. Open control valve on tester and shut off engine.
Note:
charge relief valve (R4). (R4) pressure will affect (R5)
pressure.
The implement relief valve (R5) is in series with
CAUTION
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
6. Implement relief valve (R5) pressure should be
1050 to 1250 PSI (72.5 to 86.3 bar) higher than the
chargereliefvalve(R4)pressure(e.g.ifthechargere-
lief valve pressure is 100 PSI, the implement relief valve
(R5) pressure should be 1150 to 1350 PSI).
3.
Disconnecthydraulichosefromthedischargefitting
of gear pump (P2) (end pump section).
7.
If relief valve (R5) pressure is incorrect, inspect re-
4.
Install tester in series with the gear pump and the
lief valve (R5) located in the steering control valve (see
Steering Control Valve Service in the Service and Re-
pairs section of this Chapter). Clean relief valve or ser-
vice steering control valve as needed.
disconnected hose. Make sure that tester flow arrow
points from the pump discharge and toward the discon-
nected hose. Make sure flow control valve on the
tester is fully open.
IMPORTANT: Hold steering wheel at full lock only
long enough to get a system pressure reading.
5.
neutral and the parking brake is engaged.
Make sure that traction pedal and lift control are in
8.
Relief Valve (R5) is also activated by the steering
6.
7.
slowly closing the flow control valve on the tester until
the pressure gauge reads 800 PSI (55.2 bar).
Operate engine at full speed (2850 + 50 RPM).
system. With tester still connected to gear pump P2,
start engine and watch the pressure gauge. Turn the
steeringwheelcompletely inonedirectionandhold.Re-
lief valve (R5) should open just after rear wheel gets to
the full lock position. Relief pressure measured with the
steering system should be similar to results in step 5.
Watch flow and pressure gauge carefully while
8.
Record test results.
Minimum flow gauge reading should be 3.1 GPM.
Note:
Lower Cutting Units Relief Valve (R2) Pressure
9.
Open control valve on tester and shut off engine.
If specification is not met, check for restriction in the
can be measured with tester positioned as described in
this check (see Lower Cutting Units Relief Valve (R2)
Pressure Test in this section).
10.
pump intake line. If no restriction is found, repair or re-
place gear pump (P2).
9. If testing is complete, disconnect tester from the
pump and hose. Reconnect hose to the pump.
Procedure for Implement Relief Valve (R5) Pressure
Test:
CAUTION
Do not allow pressure to exceed 1400 PSI (82.8
bar).
1.
sure (see Charge Relief Valve (R4) Pressure Test in this
section).
Measure and record charge relief valve (R4) pres-
2.
(steps3and4).Fullyopencontrolvalveonthetester.
Use same tester connections as described above
Greensmaster 3150
Page 4 -- 37
Hydraulic System (Rev. E)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Greensmaster 3150 |
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| Document Type | Service Manual |
| Language | English |
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| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
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