Toro Groundsmaster 4500-D Series Service Manual page 186

Procedure for Gear Pump Flow Test (continued)
Hydraulic System: Testing
#6 Deck
(GM4700)
g308386
4. Determine which gear pump section is to be tested. Disconnect hydraulic
hose from fitting in gear pump section that is to be tested
5. Install tester (flow and pressure) in series with the disconnected hose and
hydraulic fitting in gear pump section.
6. Make sure the flow control valve on tester is fully open.
7. Start engine and increase engine speed to high idle speed. Do not engage
the cutting decks.
Do not fully restrict oil flow through tester. In this test, the flow tester
is positioned before the relief valve. Pump damage can occur if the
oil flow is fully restricted.
8. Watch pressure gauge carefully while slowly closing the flow control valve
until 69 bar (1000 PSI) is obtained. Verify with the InfoCenter display that the
engine is still running at the correct high idle speed.
Note: If engine speed drops during testing, pump flow will decrease and
flow test results will be inaccurate.
9. Normal flow indication for the four (4) gear pump sections is listed in below
table:
PUMP SECTION
FIRST SECTION
SECOND SECTION
THIRD SECTION
FOURTH SECTION
10. Shut off engine and record test results.
11. If a pressure of 69 bar (1000 PSI) cannot be obtained or flow was less than
the minimum flow listed in above table, check for restriction in the pump
#4 Deck #1 Deck
#2 #3
Deck Deck
Figure 92
CUTTING DECK LOCATIONS
IMPORTANT
NORMAL FLOW
41.6 LPM (11 GPM)
41.6 LPM (11 GPM)
22.7 LPM (6 GPM)
22.7 LPM (6 GPM)
Page 5–84
#5 Deck
#7 Deck
(GM4700)
(Figure 91).
MINIMUM FLOW
34 LPM (9 GPM)
34 LPM (9 GPM)
18 LPM (4.8 GPM)
18 LPM (4.8 GPM)
Groundsmaster ® 4500-D/4700-D
19245SL Rev A