Test No. 4: Rear Mow Circuit Pressure - Toro Reelmaster 5100-D Service Manual

TEST NO. 4: Rear Mow Circuit Pressure

1. Make sure hydraulic oil is at normal operating tem­
perature by operating the machine for approximately 10
minutes.
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 seat to get access to hydraulic test fittings.
Remove access cover from in front of hydraulic valve
block. Install a 5000 PSI gauge with extension hose onto
quick disconnect fitting in port G2. Put gauge and hose
through opening in front of hydraulic valve block as
shown, then lower the seat (Fig. 20a).
NOTE: It may be necessary to rotate 90° fitting in port
G2 so seat can be lowered after pressure gauge with
extension hose is connected. Loosen nut and rotate 90°
fitting in port G2 1/4 turn so test fitting points forward.
Tighten nut to seat o-ring and secure fitting.
4. With cutting units in lowered position and engine OFF,
insert a block of wood, as shown in Figure 20b, between
cutting unit reel blades and front cross tube of left-rear
(No. 2) cutting unit to prevent reel from turning.
5. Sit on the seat and start the engine. Move throttle to
full speed (approx. 3200 RPM).
WARNING
Keep away from reels during test to prevent
personal injury from rotating reel blades.
6. 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 TO BE 2000 ± 50 PSI.
NOTE: Normal operating pressure when mowing is
approximately 500 to 600 PSI per cutting unit. Normal
operating pressure of rear circuit (two cutting units)
when mowing is approximately 1000 to 1200 PSI.
7. Stop the engine. If pressure is too high, remove cap
on relief valve R2 and adjust screw to get correct
pressure (Fig. 20c). If pressure is too low, check for
restriction in pump intake line. Remove cap from relief
valve R2 and adjust screw to get correct pressure. If
pressure is still too low, pump or motor should be
suspected of wear, damage or inefficiency.
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Reelmaster 5100-D
1
Page 4 - 29 Rev. A
Figure 20a
1. Test port G2
Figure 20b
Figure 20c
(Adjusting R2 shown)
Testing