Test No. 3: Relief Valve (R1) Pressure - Toro Reelmaster 5200-D Service Manual

TEST NO. 3: Relief Valve (R1) Pressure

Note: The front mowing circuit and cutting unit lift cir-
cuit share the same relief valve (R1). See Hydraulic
Flow Diagrams at the beginning of this chapter.
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
2. Make sure machine is parked on a level surface with
the cutting units lowered and off. Make sure engine is
off.
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS, and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
3. Raise seat to get access to hydraulic test fittings. Re-
move 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. 18). Put gauge and
hose through opening in front of hydraulic valve block as
shown, then lower the seat (Fig. 19).
Note: It may be necessary to rotate 90_ fitting in port
G1 so seat can be lowered after pressure gauge with ex-
tension 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. Set reel speed controls (FC1 and FC2) to position 5.
Make sure backlap switch is OFF.
5. Sit on the seat and start the engine. Move throttle to
full speed (3200 RPM).
6. 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 2950 to 3050 PSI.
Hydraulic System
CAUTION
1. Test port G1
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1. Test port G1
7. Stop the engine. If pressure is too high, remove cap
on relief valve R1 and adjust screw to get correct pres-
sure (see Adjust Manifold Relief Valves). If pressure is
too low, check for restriction in pump intake line. Re-
move 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 in-
efficiency.
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.
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Figure 18
2. Test port G2
Figure 19
2. Test gauge
Reelmaster 5200-D/5400-D
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