Toro Groundsmaster 5900 Series Service Manual page 155

Procedure for Cutting Deck Circuit Relief Pressure Test (continued)
Groundsmaster ® 5900 & 5910
16227SL Rev B
Make sure that the oil flow indicator arrow on the flow gauge is
showing that the oil will flow from the manifold, through the tester
and into the disconnected hydraulic hose.
4. Install 40 GPM tester (flow and pressure) in series between the deck manifold
port M1 and the disconnected hose. Make sure the flow control valve on
tester is fully open.
Cutting deck blades will rotate when cutting decks are lowered with
PTO switch in ON position. Keep away from cutting decks during
test to prevent personal injury from rotating blades. Do not stand
in front of the machine.
5. After installing hydraulic tester, start engine and run at low idle speed. Check
for hydraulic leakage at tester connections and correct before proceeding
with test.
6. Increase engine speed to high idle speed (2530 RPM). Release the parking
brake and engage the cutting decks.
7. Watch tester pressure gauge carefully while slowly closing the tester flow
control valve to fully closed.
8. As the cutting deck circuit relief valve lifts, system pressure should be
approximately:
203 to 224 bar (2950 to 3250 PSI) for the center and left decks.
127 to 148 bar (1850 to 2150 PSI) for the right deck.
9. After identifying relief valve pressure, fully open tester flow control valve,
disengage cutting decks and decrease engine speed to low idle. Shut off
engine and record test results.
10. If relief pressure is incorrect, remove PRV valve on deck manifold and clean
or replace valve (see
PRV valve service, perform relief pressure test again and if pressure is
still low, check for restriction in gear pump inlet line. The first gear pump
section (for front deck circuit) and/or the second gear pump section (for side
deck circuits) could also be suspected of wear, damage or inefficiency (see
Procedure for Gear Pump Flow Test (page
11. When relief pressure testing is complete, disconnect tester from deck
manifold fitting and hydraulic hose. Reconnect hydraulic hose that was
disconnected for test procedure.
12. Repeat test for other cutting deck circuits if necessary.
13. When testing is complete, make sure that the hydraulic tank is full before
returning machine to operation.
IMPORTANT
CAUTION
Traction Control Manifold Service (page
Page 5–55
5–112)). After
5–68)).
Hydraulic System: Testing