Procedure for Lower Cutting Units Relief Valve (R2)
Pressure Test
B. For
machines
with
serial
number
over
230000000, reliefpressure should be 400 PSI(27.6
bar) higher than charge relief (R4) pressure (e.g.
if charge relief valve pressure is 100 PSI (6.9 bar),
the lower relief valve (R2) pressure should be
approximately 500 PSI (34.5 bar)).
1.
peraturebyoperatingthemachineforapproximatelyten
Make sure hydraulic oil is at normal operating tem-
(10)
2.
minutes.
Park machine on a level surface with the cutting
8.
If relief valve (R2) pressure is incorrect, adjust relief
units lowered. Make sure engine is off and the parking
brake is engaged. Make sure the hydraulic tank is full.
valve (R2) (see Adjust Manifold Relief Valves in the Ad-
justments section of this Chapter). Retest relief valve
pressure if adjustment is performed.
CAUTION
9.
gear pump and hose. Reconnect hose to hydraulic fit-
ting on pump.
After testing is complete, disconnect tester from
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
MANIFOLD FROM MACHINE
WITH SERIAL NUMBER
UNDER 270000000 SHOWN
S1
FRONT
3.
sure (see Charge Relief Valve (R4) Pressure Test in this
section).
Measure and record charge relief valve (R4) pres-
S3
4.
Use same tester connections as described in
Charge Relief Valve (R4) Pressure Test. Fully open
control valve on the tester.
5.
50
Start engine and move throttle to full speed (2750 +
RPM). Make sure that cutting units are fully lowered
S4
and engage the cutting units.
S2
Note:
automatically turns off after approximately six (6) sec-
onds.
The LOWER function is electrically timed and
RELIEF
VALVE (R2)
Figure 16
6.
Watch pressure gauge carefully while moving the
Raise/Lower -- Mow Control lever to LOWER and note
pressure that relief valve opens. Shut off engine and re-
cord test results.
S2
S3
FRONT
Note:
While performing this hydraulic test, if relief
pressurecannotbedeterminedwithintheLOWERfunc-
tion six (6) second timeframe, repeat this test proce-
dure.
S4
Note:
The lower cutting units relief valve (R2) is in se-
ries with charge relief valve (R4). (R4) pressure will af-
fect (R2) pressure.
S1R1
7.
The lower cutting units relief pressure (R4) should
be:
MANIFOLD FROM MACHINE
WITH SERIAL NUMBER
OVER 270000000 SHOWN
A. For machines with serial number under
RELIEF
VALVE (R2)
220999999,
reliefpressure should be 150 PSI(10.3
bar) higher than charge relief (R4) pressure (e.g.
if charge relief valve pressure is 100 PSI (6.9 bar),
the lower relief valve (R2) pressure should be
approximately 250 PSI (17.2 bar)).
Figure 17
Greensmaster 3250--D
Page 4 -- 43
Hydraulic System (Rev. I)
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