Test No. 6: Rear Mow Circuit Pressure - Toro Reelmaster 6500–D Service Manual

TEST NO. 6: Rear Mow Circuit Pressure

1. Make sure hydraulic oil is at normal operating temper-
ature before doing test.
2. Lower cutting units, engage parking brake and stop
the engine. Set HOC Selector Knob, located under the
instrument panel, to position A (full speed). Make sure
Backlap switch is OFF.
3. Raise hood to get access to hydraulic test fittings. Re-
move fiberglass access cover from behind seat. Install
a 5000 PSI gauge with extension hose onto quick dis-
connect fitting in port G1B. Carefully close hood and put
gauge and hose through opening in front of hood where
access cover was removed.
4. Sit on the seat and start the engine. Move throttle to
full speed (approx. 2500 RPM for 6500–D and 2750
RPM for 6700–D).
WARNING
Keep away from reels during tests to prevent
personal injury from rotating reel blades.
5. While sitting on seat, move "Enable/Disable" switch
to ENABLE. Move "Lower–Mow/Raise" lever forward to
engage cutting units, then look at the gauge.
GAUGE READING:
6500–D: Approx. 800 PSI (free running)
1000 to 1200 PSI (mowing)
6700–D: Approx. 1200 PSI (free running)
2000 to 2400 PSI (mowing with all
cutting units lowered)
6. Stop the engine. If pressure is too high, bedknife to
reel contact may be too tight and/or the cutting units are
dull. If pressure is too low, do relief pressure test.
Relief Pressure Test
7. Disconnect wire connector from solenoid S2B.
8. While sitting on seat, move "Enable/Disable" switch
to ENABLE. Move "Lower–Mow/Raise" lever forward to
engage cutting units, then look at the gauge.
GAUGE READING: 2800 – 3200 PSI
9. Stop the engine. If pressure is too low, remove cap
from relief valve R1B and adjust screw to get correct
pressure. If pressure will not increase by adjusting relief
valve, the relief valve may be stuck open. If relief valve
is operating properly, solenoid valve VS1B or S1B may
be stuck open or pump should be suspected of wear and
inefficiency.
Reelmaster 6500–D/6700–D
2
(Reelmaster 6500–D Shown)
Rev. B
Page 4 – 35
1
Figure 17
(Rear Valve Block)
1. Test port G1B
2. Relief valve R1B
Hydraulic System