Toro Greensmaster 3150 Service Manual page 55

Procedure for Lower Cutting Units Relief Valve (R2)
Pressure Check:
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 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 TEST NO. 3: Charge Relief Valve (R4) Pres-
sure in this chapter).
4. Use same tester connections as described in TEST
NO. 4: Gear Pump (P2) Flow and Implement Relief
Valve (R5) Pressure. Fully open control valve on the
tester.
Note: The lower function is electrically timed and au-
tomatically turns off after a few seconds. For this hydrau-
lic test, it is necessary to reverse the lower/raise
functions so the hydraulic lower function can be
checked using the raise electrical circuit (without the
timer).
5. Change the following electrical connections to re-
verse the lower/raise function:
A. Disconnect the connectors for solenoids S3 and
S4 at the manifold block.
B. Connect male connector from solenoid S3 to the
female connector (white/black and black), located
on the wiring harness, for solenoid S4.
C. Connect male connector from solenoid S4 to the
female connector (blue/red and black), located on
the wiring harness, for solenoid S3.
6. Start engine and move throttle to full speed (2850 +
50 RPM). Engage the cutting units.
Greensmaster 3150
7. Watch pressure gauge carefully while moving the
Raise/Lower – Mow Control lever to the RAISE position.
Hold the control lever in the RAISE position until the re-
lief valve opens. Release control lever and shut off en-
gine. Record test results.
Note: The lower cutting units relief valve (R2) is in se-
ries with charge relief valve (R4). (R4) pressure will af-
fect (R2) pressure.
8. The lower cutting units relief pressure (R2) should
be 300 PSI (21.0 bar) higher than charge relief (R4)
pressure (e.g. if charge relief valve pressure is 100 PSI,
the lower relief valve (R2) pressure should be 400 PSI).
9. 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.
10. Reconnect the following electrical connections:
A. Disconnect the connectors for solenoids S3 and
S4 at the manifold block.
B. Connect male connector from solenoid S3 to the
female connector (blue/red and black), located on
the wiring harness, for solenoid S3.
C. Connect male connector from solenoid S4 to the
female connector (white/black and black), located
on the wiring harness, for solenoid S4.
11. If testing is complete, Disconnect test gauge from
gear pump and hose. Reconnect hose to hydraulic fit-
ting on pump.
Page 4 – 31 Rev. C
Hydraulic System