Toro Groundsmaster 4300-D Service Manual page 122

Test Procedure
Hydraulic System: Testing the Hydraulic System
g212309
1. Test fitting (port G2)
2. Deck control manifold
1. Ensure that the hydraulic fluid is at normal operating temperature by
operating the machine for at least 10 minutes.
2. Park the machine on a level surface with the PTO switch off, lower the cutting
decks, shut off the engine, set the mow speed limiter to the M
and set the parking brake.
3. Read all Warning, Cautions, and precautions listed at the beginning of this
section.
4. For testing the rear mow circuit, remove the cap from the test fitting at deck
control manifold port (G1) and install a pressure gauge with hydraulic hose to
the test fitting (Figure
from the test fitting at deck control manifold port (G2) and install a pressure
gauge with hydraulic hose to the test fitting.
Keep away from the cutting units during test to prevent personal
injury from the cutting blades.
5. Sit in the operator's seat, start the engine, and press the engine speed switch
to full speed (3,005 to 3,055 rpm) position. Use the InfoCenter to check that
the engine speed is correct.
6. Engage the cutting decks. When engaged, the cutting circuit pressure may
exceed manifold relief valve pressure setting of 24,100 kPa (3,500 psi) for
front mow circuit and 17,500 kPa (2,500 psi) for rear mow circuit momentarily
opening the relief valve. The circuit pressure should then stabilize at
approximately 8,274 kPa (1,200 psi).
7. Safely secure the test pressure gauge and operate the machine under your
specific mowing conditions. Monitor the test gauge while mowing. The
cutting unit circuit pressure should be approximately: 10,340 to 13,800 kPa
(1,500 to 2,000 psi) under low to normal load conditions.
8. Disengage the cutting units, press the engine speed switch to low speed
(1,175 to 1,225 rpm) position, and shut off the engine.
Figure 62
3. Test fitting (port G1)
62). If testing the front mow circuit, remove the cap
CAUTION
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position,
OW
Groundsmaster ® 4300-D
16226SL Rev C