TEST NO. 3: Front Mow / Lift 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.
3. Raise seat to get access to hydrauli
c 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 G1 (Fig. 19). Put gauge
and hose through opening in front of hydraulic valve
block as shown, then lower the seat (Fig. 19A).
NOTE: It may be necessary to rotate 90° f
itting in port
G1 so seat can be lowered after pressure gauge with
extension hose is connected. Loosen nut and rotate 90°
fitting in port G1 1/4 turn so test fitting points to the right.
Tighten nut to seat o-ring and secure fitting.
4. Sit on the seat and start the engine. Move throttle to
f
ull speed (approx. 3200 RPM).
5. While sitting on the seat, pull “Lower-Mow/Raise”
control lever back to the RAISE position to lift the cutting
units. Hold the lever in the RAISE position while looking
at the gauge.
GAUGE READING TO BE 3000 ± 50 PS
I.
NOTE: Normal operating pressure when mowing is
approximately 500 to 600 PSI per cutting unit. Normal
operating pressure of front circuit (three cutting units)
when mowing is approximately 1500 to 1800 PSI.
6. Stop the engi
ne. If pressure is too high, remove cap
on relief valve R1 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 R1 and adjust screw to get correct pressure. If
pressure is still too low, pump or lift cylinder(s) should
be suspected of wear, damage or inefficiency.
1
2
Figure 19
1. Test port G1 2. Test port G2
1
Figure 19A
1. Test port G1
Testing Page 4 - 28 Reelmaster
®
5100-D
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