Service Manual

Rev. J
Greensmaster 3250--D
Hydraulic System (Rev. I)
Page 4 -- 41
CAUTION
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
3. Ongearpump(P2)(rearpumpsection),disconnect
the hydraulic hose from the discharge fitting on the bot-
tom of the pump.
4. Install tester with pressure gauge and flow meter in
series with gear pump (P2) and the disconnected hose.
Makesuretheflowcontrolvalveonthetesterisfully
open.
5. Make sure that traction pedal and lift control are in
neutral and the parking brake is engaged.
6. Operate engine at full speed (2750 +
50 RPM).
7. 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).
8. Minimum flow gauge reading should be 3.1 GPM.
Record test results.
9. Open control valve on tester and shut off engine.
10. Ifspecification isnotmet, checkforrestriction inthe
pump intake line. If no restriction is found, repair or re-
place gear pump (P2).
ProcedureforImplement Relief Valve (R5)Pressure
Test
CAUTION
Do not allow pressure to exceed 1400 PSI (82.8
bar).
1. Measure and record charge relief valve (R4) pres-
sure(seeChargeReliefValve(R4)PressureTestinthis
section).
2. Use same tester connections as described in Gear
Pump (P2) Flow Test (see above). Fully open control
valve on the tester.
3. Startandrun engineatfullspeed(2750+
50RPM).
4. Watch the pressure gauge on the tester and move
the lift lever to the raise position. Momentarily hold the
liftleverwith thecuttingunitsfullyraisedcausing the re-
liefvalve(R5)toopen.Recordpressure atwhichthere-
lief valve (R5) opens.
5. Open control valve on tester and shut off engine.
Note: The implement reliefvalve(R5)isinserieswith
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
220999999, relief valve (R5) pressure should be
900 to 1100 PSI (62 to 76 bar) higher than the
charge relief valve (R4) pressure (e.g. if the
chargereliefvalvepressureis100PSI(6.9bar),the
implement relief valve (R5) pressure should be
1000 to 1200 PSI (69 to 83 bar)).
B. For machines with serial number over
230000000, relief valve (R5) pressure should be
1050 to 1250 PSI (73 to 86 bar) higher than the
charge relief valve (R4) pressure (e.g. if the
chargereliefvalvepressureis100PSI(6.9bar),the
implement relief valve (R5) pressure should be
1150 to 1350 PSI (80 to 93 bar)).
7. If relief valve (R5) pressure is incorrect:
A. For machines with serial number under
220999999, adjust implement relief valve (see Ad-
justImplementReliefValve(R5)intheAdjustments
sectionofthisChapter).Retestreliefvalvepressure
if adjustment is performed.
B. For machines with serial number over
230000000, inspect relief valve (R5) located in the
steering control valve (see Steering C ontrol Valve
Service in the Service and Repairs section of this
Chapter).Cleanreliefvalveorservicesteeringcon-
trol valve as needed.
IMPORTANT: Hold steering wheel at full lock only
long enough to get a system pressure reading.
8. Relief Valve (R5) is also activated by the steering
system. With tester still connected to gear pump P2,
start engine and watch the pressure gauge. Turn the
steeringwheelcompletelyinonedirectionandhold.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.
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).
9. Aftertestingis complete,disconnecttester fromthe
pump and hose. Reconnect hose to the pump.