Toro 30821 Service Manual page 79

Procedure for Gear Pump (P2) Flow Test:
2
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
RIGHT
2. Park machine on a level surface with the cutting units
FRONT
lowered and off. Make sure engine is off and the parking
brake is engaged.
3. Read Precautions for Hydraulic Testing.
4. Disconnect hose connection on the gear pump (P2)
1
leading to the steering control valve (Fig. 56).
5. Install tester in series with gear pump and the discon-
nected hose leading to the steering control valve.
Figure 56
6. Make sure the flow control valve on the tester is fully
1. Gear pump (P2) 2. To steering control valve
open.
7. Start engine and move throttle to full speed (3050 +
50 RPM). Do not engage the cutting units.
IMPORTANT: In this test, the hydraulic tester is
positioned before the manifold relief valve. Pump
damage can occur if the oil flow is fully restricted by
fully closing the tester flow control valve. Do not
close tester valve fully when performing test.
8. Watch pressure gauge carefully while slowly closing
the flow control valve until 800 PSI is obtained. Verify
with a phototac that the pump speed is 3100 RPM while
maintaining 800 PSI.
9. Flow indication should be 3.6 GPM minimum.
10.Shut off engine.
NOTE: If necessary, Steering and Lift Relief Pressure
Test can be conducted with tester as placed for this test.
11. If flow was less than 3.6 GPM or a pressure of 800
PSI cannot be obtained, check for restriction in the pump
intake line. If line is not restricted, remove gear pump
(P2) and repair or replace as necessary.
12.Disconnect tester from gear pump fitting and hose.
Reconnect hose to the pump.
Groundsmaster 3500- D Page 4 - 39 Hydraulic System (Rev. G)