Toro 30821 Service Manual page 93

Procedure for Lift and Steering Control Valve Relief
Pressure Test:
2
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
RIGHT
minutes.
FRONT
2. Park machine on a level surface with the cutting units
lowered and off. Make sure engine is off and the parking
brake is engaged.
3. Read Precautions for Hydraulic Testing.
1
4. Disconnect hose connection on gear pump (P2)
leading to the steering control valve (Fig. 70).
5. Install T- connector with test gauge in series with the
discharge of the gear pump and the disconnected hose
Figure 70
leading to the steering control valve.
1. Gear pump (P2) 2. To steering control valve
6. Make sure steering wheel is positioned so the rear
wheel points directly ahead.
7. Start engine and move throttle to full speed (3050 +
50 RPM).
IMPORTANT: Do not allow pressure to exceed 1500
PSI.
IMPORTANT: Hold steering wheel at full lock only
long enough to get a system pressure reading.
Holding the steering wheel against the stop for an
extended period may damage the steering control
valve.
8. Watch pressure gauge carefully while turning the
steering wheel completely in one direction and holding.
9. System pressure should be from 845 to 995 PSI as
the relief valve lifts. Return steering wheel to the center
position. If specification is not met, shut off engine and
repair or replace steering control valve.
10.Disconnect T- connector with test gauge from pump
connection and hose. Reconnect hydraulic hose to gear
pump (P2).
Groundsmaster 3500- D Page 4 - 53 Hydraulic System (Rev. G)