Toro Groundsmaster 4500-D Series Service Manual page 169

Procedure for Cutting Deck Circuit Relief Pressure Test (continued)
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
B. For second gear pump section (decks #1, #4 and #6), cutting deck circuit
relief (PRV1) is tested at the inlet to the deck #1 motor
4. Thoroughly clean junction of appropriate hydraulic inlet hose and deck motor
fitting (Figure 78). Disconnect the hydraulic inlet hose from the deck motor.
Make sure that the oil flow indicator arrow on the tester is showing
that the oil will flow from the disconnected hose, through the tester
and into the deck motor.
5. Install tester with pressure gauge and flow meter in series with the
disconnected hose and deck motor inlet. Make sure the tester flow control
valve is fully open.
6. After installing pressure gauge, start engine and run at low idle speed. Check
for hydraulic leakage and correct before proceeding with test.
Keep away from decks during test to prevent personal injury from
the cutting blades.
7. Increase engine speed to high idle speed. Engage the cutting decks.
8. Watch tester pressure gauge carefully while slowly closing the flow control
valve on tester.
9. As the circuit relief valve lifts, system pressure should be from 235 to 258 bar
(3400 to 3750 PSI).
10. Open the tester flow control valve, disengage cutting decks and stop the
engine. Record test results.
11. If specification is not met, make sure that electrical connections at deck
control manifold are secure and then clean or replace relief valve (PRV1
or PRV2) in the deck control manifold (see
5–130)). Also, if pressure is still low after relief valve service, check for
restriction in pump intake line. The first or second gear pump section could
also be suspected of wear or damage (see
with Pressure Gauge & Flow Meter) (page
12. After testing is complete, disconnect tester from deck motor and hose.
Connect hydraulic hose to motor.
IMPORTANT
CAUTION
Page 5–67
(Figure
Deck Control Manifold (page
Gear Pump Flow (Using Tester
5–82)).
Hydraulic System: Testing
77).