Toro Groundsmaster 4000-D Service Manual page 115

Procedure for Gear Pump Flow Test
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.
1. Park machine on a level surface with the cutting
decks lowered and off. Make sure hydraulic oil is at nor-
mal operating temperature, engine is off and the parking
brake is applied.
2. Raise and support operator seat to gain access to
gear pump.
3. Determine which gear pump section is to be tested.
Disconnect hydraulic hose from fitting in gear pump sec-
tion that is to be tested (Fig. 47).
4. Install tester (flow and pressure) in series with the
disconnected hose and hydraulic fitting in gear pump
section.
5. Make sure the flow control valve on tester is fully
open.
6. Start engine and increase engine speed to high idle
speed. Do not engage the cutting decks.
IMPORTANT: Do not fully restrict oil flow through
tester. In this test, the flow tester is positioned be-
fore the relief valve. Pump damage can occur if the
oil flow is fully restricted.
7. Watch pressure gauge carefully while slowly closing
the flow control valve until 1000 PSI (69 bar) 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.
8. Normal flow indication for the four (4) gear pump sec-
tions is listed in Figure 48.
9. Shut off engine and record test results.
Groundsmaster 4000--D/4010--D
10.If a pressure of 1000 PSI (69 bar) cannot be obtained
or flow was less than the minimum flow listed in Figure
48, check for restriction in the pump intake line. If line is
not restricted, consider that the tested gear pump sec-
tion is worn or damaged.
11. After testing is completed, disconnect flow tester
from hydraulic hose and fitting in gear pump section. Re-
connect hose to the pump fitting.
12.Lower and secure operator seat.
3
4
1. Front pump section (LH and RH PTO)
nd
2. 2 pump section (front PTO)
rd
3. 3 pump section (cooling fan, lift/lower and charge)
th
4. 4 pump section (steering, charge and cooling fan)
PUMP
SECTION
FRONT
SECTION
SECOND
SECTION
THIRD
SECTION
FOURTH
SECTION
Page 4 - - 69
1
2
Figure 47
NORMAL MINIMUM
FLOW FLOW
14 GPM 11 GPM
(53 LPM) (41.6 LPM)
14 GPM 11 GPM
(53 LPM) (41.6 LPM)
4.3 GPM 3.4 GPM
(16.3 LPM) (12.8 LPM)
3.2 GPM 2.5 GPM
(12.1 LPM) (9.5 LPM)
Figure 48
Hydraulic System