Toro Reelmaster 7000-D Service Manual page 145

Steering/Lift Circuit− Lift Relief Pressure Test
If all cutting unit lift arms perform poorly during both raise
and lower operations, the lift circuit relief pressure test
should be performed. If both steering and lift operations
perform poorly, perform the flow test on gear pump sec-
tion P4 (see Gear Pump Flow Test in this chapter).
Special Equipment Required:
S Pressure Gauge − 5000 PSI (350 bar) with hose
S Phototach (non−contact tachometer)
1. Park machine on a level surface with the cutting units
fully lowered and the reel enable/disable switch in the
DISABLE position. Apply the parking brake and stop en-
gine.
CAUTION
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.
2. Raise and support operator's seat to gain access to
lift manifold (Fig. 42). Connect a 5000 PSI (350 bar)
pressure gauge with hydraulic hose attached to lift man-
ifold test port G. The pressure gauge hydraulic hose
must be routed to safely view the tester while sitting in
the operator's seat. Route gauge hose to allow hood to
be safely lowered.
3. After installing pressure gauge, start engine and run
at low idle speed. Check for hydraulic leakage and cor-
rect before proceeding with test.
4. Set throttle to high speed.
A. Use the InfoCenter display to verify engine RPM
on units with Yanmar diesel engines (2850 RPM).
B. Use a phototach to verify engine RPM on units
with Kubota diesel engines (2850 +50/−120 RPM).
5. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes. Make sure the hydraulic tank is full.
6. Lower and sit in the operator's seat. Move the joy-
stick to raise and allow the cutting units to fully raise. Mo-
mentarily hold the joystick with the lift cylinders fully
retracted (cutting units raised) while looking at the pres-
sure gauge.
Reelmaster 7000−D
2
1. Lift manifold
2. Test port G1
7. When the lift cylinders are fully retracted (cutting
units fully raised) the relief valve opens and the pressure
gauge needle will momentarily stop. System pressure
as the relief valve RV1 opens should be be approximate-
ly 1700 PSI (117 bar). Release joystick to the neutral
position after observing relief valve pressure.
NOTE: If joystick is held in the raise position after the
relief valve has opened, system pressure can increase
higher than relief pressure.
8. Stop the engine and record test results.
9. If specification is not met, clean or adjust relief valve
RV1 located in the lift manifold.
A. If pressure is too high, adjust relief valve RV1 to
reduce lift/lower circuit relief pressure (see Adjust
Control Manifold Relief Valves in the Adjustments
section of this chapter).
B. If pressure is too low, clean relief valve RV1 (see
Lift Manifold in this chapter). Check for restriction in
gear pump intake line. Adjust relief valve RV1 to in-
crease lift circuit relief pressure if necessary (see Ad-
just Control Manifold Relief Valves in this chapter).
C. If pressure is still too low after relief valve adjust-
ment/service, lift cylinder(s) or gear pump P4 should
be suspect of wear or damage.
10.After testing is completed, remove pressure gauge
from manifold test port. Install dust cap to test port fitting.
Lower and secure hood.
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1
Figure 42
3. Relief valve RV1
Hydraulic System