Toro Groundsmaster 4300-D Service Manual page 141

Test Procedure
Groundsmaster ® 4300-D
16226SL Rev C
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, mow speed limiter is in the M
set the parking brake.
3. Read all Warning, Cautions, and precautions listed at the beginning of this
section.
g217321
1. PRV solenoid
2. Test port (G4)
4. Clean the test port (G4) on the bottom of lift control manifold, and then
connect a 35,000 kPa (5,000 psi) pressure gauge to the test port
5. After installing the pressure gauge to the manifold test port, start the engine
and run it at low-idle speed. Check for hydraulic-fluid leaks from the test
connections and correct before continuing the test.
6. 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.
Do not allow the pressure to exceed 17,500 kPa (2,500 psi).
When performing this test, hold the joystick lever in the R
position, only long enough to get a system pressure reading.
Holding the lever in R
system components.
7. Ensure that the PTO switch is O
to pressurize the lift circuit. While holding lever in the R
position, monitor the pressure gauge carefully.
8. When the cutting decks reach the fully raised position and the lift relief valve
lifts, the system pressure should be approximately 13,800 kPa (2,000 psi).
9. Return the joystick lever to the N
Figure 74
3. Lift control manifold
IMPORTANT
IMPORTANT
for an extended period may damage
AISE
, and then pull the joystick lever rearward
FF
position, and shut off the engine.
EUTRAL
Page 4–79 Hydraulic System: Testing the Hydraulic System
position, and
OW
(Figure 74).
AISE
(rearward)
AISE