Toro 03781, Service Manual

Page: 129 / 468

Reelmaster 7000−D Hydraulic System Page 5 − 59
Cutting Unit Circuit − Pressure Test
Cutting unit circuit pressure is the first in a series of tests
recommended to check cutting unit circuit performance.
The results from this test will help determine which com-
ponent(s) are the cause of cutting unit performance is-
sues.
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
lowered and disengaged. Make sure engine is off and
the parking brake is engaged. The backlap levers on the
mow control manifold should be in the mow (F) position.
2. Raise hood to allow access to mow control manifold.
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.
3. Connect a 5000 PSI (350 bar) pressure gauge with
hydraulic hose attached to the mow control manifold test
port for the mow circuit to be tested (Fig. 38). The pres-
sure gauge hydraulic hose must be long enough to safe-
ly view the pressure gauge while sitting in the operator’s
seat. Manifold test port G1 should be used for testing the
front cutting units and G2 should be used for testing the
rear cutting units.
4. Start engine and run at low idle speed. Check for hy-
draulic leakage and make corrections if necessary be-
fore proceeding with test.
5. 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).
6. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
7. Sit in the operator’s seat, set the mow speed limiter
to the LOW speed (mow) position, and release the park-
ing brake.
1. Test port G1 (front cutting unit circuit)
2. Test port G3 (rear cutting unit circuit)
Figure 38
FRONT
1
2
CAUTION
Cutting unit blades will rotate when lowered with
enable/disable switch in ENABLE position. Keep
away from cutting units during test to prevent
personal injury from rotating blades. Do not
stand in front of the machine during test.
8. Use the InfoCenter display to record the current reel
speed settings. Set the circuit being tested (front or rear)
reel speed to maximum and engage the cutting units.
When engaged, the cutting circuit pressure may exceed
manifold relief valve pressure setting of 3000 PSI (207
Bar) momentarily opening the relief valve. Circuit pres-
sure should then stabilize.
9. Safely secure the test pressure gauge and operate
the machine under your specific mowing conditions.
Monitor test gauge while mowing. Cutting unit circuit
pressure should be approximately 1350 PSI (93 Bar) for
the front cutting unit circuit and 1000 PSI (69 Bar) for the
rear cutting unit circuit at maximum reel speed.
10.Disengage cutting units, move throttle to low speed
and shut off engine.
11. If pressure readings are within specifications and
cutting unit performance is still in question, test cutting
unit motors individually (see Cutting Unit Circuit Testing
− Reel Motor Efficiency/Case Drain Test).
Hydraulic
System