Procedure for Gear Pump (P2) Flow Test
Make sure hydraulic oil is at normal operating tem-
lief valve (R5) to open. Record pressure at which the re-
lief valve (R5) opens.
1.
peraturebyoperatingthemachineforapproximatelyten
5. Open control valve on tester and shut off engine.
(10)
minutes.
Note:
The implement relief valve (R5) is in series with
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
charge relief valve (R4). (R4) pressure will affect (R5)
pressure.
6.
Implement relief valve (R5) pressure should be:
A. For machines with serial number under
CAUTION
220999999,
relief valve (R5) pressure should be
900
to 1100 PSI (62 to 76 bar) higher than the
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
charge relief valve (R4) pressure (e.g. if the
charge reliefvalve pressure is100PSI(6.9bar),the
implement relief valve (R5) pressure should be
1000 to 1200 PSI (69 to 83 bar)).
3.
Use same tester connections as described in
Charge Relief Valve (R4) Pressure Test. Fully open
control valve on the tester.
B. For
230000000,
machines
relief valve (R5) pressure should be
with serial number over
4.
neutral and the parking brake is engaged.
Make sure that traction pedal and lift control are in
1050 to 1250 PSI (73 to 86 bar) higher than the
charge relief valve (R4) pressure (e.g. if the
charge reliefvalve pressure is100PSI(6.9bar),the
implement relief valve (R5) pressure should be
5.
6.
Operate engine at full speed (2750 + 50 RPM).
1150
to 1350 PSI (80 to 93 bar)).
Watch flow and pressure gauge carefully while
slowly closing the flow control valve on the tester until
the pressure gauge reads 800 PSI (55.2 bar).
7.
If relief valve (R5) pressure is incorrect:
A. For machines with serial number under
7.
Record test results.
Minimum flow gauge reading should be 3.1 GPM.
220999999,
adjust implement relief valve (see Ad-
just Implement Relief Valve (R5) in the Adjustments
sectionofthisChapter). Retestreliefvalvepressure
if adjustment is performed.
8.
9.
pump intake line. If no restriction is found, repair or re-
place gear pump (P2).
Open control valve on tester and shut off engine.
If specification is not met, check for restriction in the
B. For
230000000,
machines
inspect relief valve (R5) located in the
with serial number over
steering control valve (see Steering Control Valve
Service in the Service and Repairs section of this
Chapter). Clean relief valve or service steering con-
trol valve as needed.
Procedure for Implement Relief Valve (R5) Pressure
Test
IMPORTANT: Hold steering wheel at full lock only
long enough to get a system pressure reading.
CAUTION
8.
Relief Valve (R5) is also activated by the steering
Do not allow pressure to exceed 1400 PSI (82.8
bar).
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.
1.
Measure and record charge relief valve (R4) pres-
sure (see Charge Relief Valve (R4) Pressure Test in this
section).
2.
Charge Relief Valve (R4) Pressure Test. Fully open
control valve on the tester.
Use same tester connections as described in
Note:
Lower Cutting Units Relief Valve (R2) Pressure
can be measured with tester positioned as described in
this check (see Lower Cutting Units Relief Valve (R2)
Pressure Test in this section).
3.
Start and run engine at full speed (2750 + 50 RPM).
9.
pump and hose. Reconnect hose to the pump.
After testing is complete, disconnect tester from the
4.
the lift lever to the raise position. Momentarily hold the
lift lever with the cutting units fully raised causing the re-
Watch the pressure gauge on the tester and move
Greensmaster 3250--D
Page 4 -- 41
Hydraulic System (Rev. I)
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