Procedure for Lower Cutting Units Relief Valve (R2)
Pressure Test:
8. If relief valve (R2) pressure is incorrect, adjust relief
valve (R2) (Fig. 20 or 21) (see Adjust Manifold Relief
Valves in the Adjustments section of this Chapter). Re-
test relief valve pressure after adjustment is performed.
1.
perature by operating the machine for approximately 10
minutes.
Make sure hydraulic oil is at normal operating tem-
9. If testing is complete, disconnect test gauge from
gear pump and hose. Reconnect hose to hydraulic fit-
ting on pump.
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
S1
S2
FRONT
S3
CAUTION
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
S4
RELIEF
VALVE (R2)
3.
Measure and record charge relief valve (R4) pres-
sure (see Charge Relief Valve (R4) Pressure Test in this
section).
S6
4.
Use same tester connections as described in the
MANIFOLD USED ON
SERIAL NUMBER BELOW
260999999
Gear Pump (P2) Flow and Implement Relief Valve (R5)
Pressure Test in this section. Fully open control valve
on the tester.
Figure 20
5.
50
Start engine and move throttle to full speed (2850 +
RPM). Make sure that cutting units are fully lowered
MANIFOLD USED ON
SERIAL NUMBER ABOVE
270000000
RELIEF
VALVE (R2)
and engage the cutting units.
S3
Note:
automatically turns off after approximately six (6) sec-
onds.
The LOWER function is electrically timed and
S1R1
FRONT
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
S4
pressurecannotbedeterminedwithintheLOWERfunc-
tion six (6) second timeframe, repeat this test proce-
dure.
S2
Figure 21
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 (R2) should
be 300 PSI (21.0 bar) higher than charge relief (R4)
pressure(e.g.ifcharge reliefvalve pressureis100PSI,
the lower relief valve (R2) pressure should be 400 PSI).
Greensmaster 3150
Page 4 -- 39
Hydraulic System (Rev. E)
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