Pressure Test - Toro Greensmaster 3250-D 04383 Service Manual

Procedure for Lower Cutting Units Relief Valve (R2)

Pressure Test

1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
2. Park machine on a level surface with the cutting
units lowered. Make sure engine is off and the parking
brake is engaged. Make sure the hydraulic tank is full.
CAUTION
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
3. Measure and record charge relief valve (R4) pres-
sure (see Charge Relief Valve (R4) Pressure Test in this
section).
4. Use same tester connections as described in Gear
Pump (P2) Flow Test. Fully open control valve on the
tester.
5. Start engine and move throttle to full speed (2750 +
50 RPM). Make sure that cutting units are fully lowered
and engage the cutting units.
Note: The LOWER function is electrically timed and
automatically turns off after approximately six (6) sec-
onds.
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.
Note: While performing this hydraulic test, if relief
pressure cannot be determined within the LOWER func-
tion six (6) second timeframe, repeat this test proce-
dure.
Note: The lower cutting units relief valve (R2) is in se-
ries with charge relief valve (R4). (R4) pressure will af-
fect (R2) pressure.
7. The lower cutting units relief pressure (R4) should
be:
A. For machines with serial number under
220999999, relief pressure 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)).
Greensmaster 3250--D
B. For machines
230000000, relief pressure 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)).
8. If relief valve (R2) pressure is incorrect, adjust relief
valve (R2) (see Adjust Manifold Relief Valves in the Ad-
justments section of this Chapter). Retest relief valve
pressure if adjustment is performed.
9. After testing is complete, disconnect tester from
gear pump and hose. Reconnect hose to hydraulic fit-
ting on pump.
FRONT
S2
RELIEF
VALVE (R2)
FRONT
S1R1
MANIFOLD FROM MACHINE
WITH SERIAL NUMBER
OVER 270000000 SHOWN
Page 4 - - 43 Rev. J
with serial number
MANIFOLD FROM MACHINE
S1
WITH SERIAL NUMBER
UNDER 270000000 SHOWN
S3
S4
Figure 16
S2
S3
RELIEF
VALVE (R2)
Figure 17
Hydraulic System (Rev. I)
over
S4