Toro Groundsmaster 3500 30807 Service Manual page 113

Cutting Deck Circuit Testing − Manifold Relief Valve
Pressure Test:
Test the performance of the manifold relief valve (S or
S1) to make sure that the maximum amount of fluid is
available to the cutting deck motors up to the set relief
pressure. This test also ensures that pump (P1) is cap-
able of generating enough pressure to open a properly
functioning manifold relief valve. The manifold relief
valve is part of the cutting deck solenoid valve.
Special Equipment Required:
S Flow Meter with Pressure Gauge that has at least
a 12 GPM (45 LPM) capacity.
1. Park machine on a level surface with the cutting units
lowered and PTO switch off. Engine should be off and
the parking brake disengaged.
2. Read Precautions for Hydraulic Testing in this
chapter.
3. Disconnect the hose from hydraulic fitting at mani-
fold port (M1) (Fig. 34 and 35).
NOTE: An alternative to using manifold port (M1) would
be to disconnect the inlet hydraulic hose to the front left
deck motor. The inlet hose is the first hose clockwise of
the smaller (center) case drain hose. (Fig. 36).
4. Install tester between the hose and hydraulic fitting.
Make sure the flow control valve on tester is fully open.
CAUTION
Keep away from decks during test to prevent per-
sonal injury from the cutting blades.
5. Start the engine and move throttle to full speed (Dies-
el engine = 3220 + 50 RPM, Gas engine = 3420 + 30
RPM).
6. Make sure hydraulic fluid is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
7. Engage the cutting units.
8. Watch pressure gauge carefully while slowly closing
the flow control valve.
9. System pressure should reach 3100 to 3330 PSI
(213.7 to 227.5 Bar) before the relief valve opens.
10.Set throttle to low speed and shut off engine.
11. If specification is met, test pump (P1) flow (see Cut-
ting Deck Circuit Testing − Gear Pump (P1) Flow Test in
this chapter) If specification is not met, clean or replace
relief valve (S or S1) (see Hydraulic Manifold Service in
this chapter) and retest.
Groundsmaster 3500
Unit Serial No.
Prior to 314000001
3
1
2
1. Hydraulic manifold
2. Manifold port (M1)
Unit Serial No.
314000001 & Up
3
2
1. Hydraulic manifold
2. Manifold port (M1)
1. Deck motor
2. Inlet hose
12.Disconnect tester and reconnect hydraulic hose.
Page 5 − 55
Figure 34
3. Relief valve (S1)
1
Figure 35
3. Relief valve (S)
4
1
Figure 36
3. Case drain hose
Hydraulic System
2