Toro Groundsmaster 4300-D Service Manual page 132

Test Procedure
Hydraulic System: Testing the Hydraulic System
1. 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.
Before opening the hydraulic system, operate all the hydraulic
controls to release system pressure and avoid injury from the
pressurized hydraulic fluid; refer to
Hydraulic System (page
2. Read all Warning, Cautions, and precautions listed at the beginning of this
section.
g189658
1. Pump P1 outlet hose
2. Pump P2 outlet hose
3. Lift and support the operator seat to get access to the hydraulic pump.
4. Identify the suspect pump section that is to be tested
5. Clean the junction of the gear pump fitting and the hydraulic outlet hose, and
then disconnect the hose from the pump fitting:
• Pump section (P1) for the rear cutting decks.
• Pump section (P2) for the front cutting decks.
Ensure that the fluid flow indicator arrow on the flow gauge is
showing that the fluid will flow from the gear pump, through the
tester, and into the hose. The engine needs to be started with the
tester connected. Route the tester hoses so that the tester can be
read while operator seat is fully lowered and occupied.
6. Install a tester with the pressure gauge and flow meter in series between the
disconnected hose and the gear pump fitting. Ensure that the flow control
valve on the tester is fully open.
CAUTION
Releasing Pressure from the
4–6).
Figure 69
3. Gear pump assembly
IMPORTANT
Page 4–70
position, and
OW
(Figure 69).
Groundsmaster ® 4300-D
16226SL Rev C