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Groundsmaster 3505--D Hydraulic SystemPage 4 -- 47
Procedure for Gear Pump (P2) Flow
Test:
1. Make sure hydraulic oil is at normal operating tem-
perature.
2. Park machine on a levelsurface with the cuttingunits
lowered and off. Make sure engine is off and the parking
brake is engaged.
3. Read Precautions for Hydraulic Testing.
WARNING
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved. See Relieving Hy-
draulic System Pressure in the General Infor -
mation section.
4. Disconnect hose connection on the gear pump (P2)
leading to the steering control valve (Fig. 31).
5. Install hydraulic tester (pressure and flow) in series
with gear pump and the disconnected hose leading to
the steering control valve.
6. Make sure the flow control valve on the tester is fully
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 pumpspeed is 3100 RPM while
maintaining 800 PSI.
9. Flow indication should be 3.6 GPM minimum.
10.Shut off engine. Record test results.
11.If flow was less than 3.6 GPM or a pressure of 800
PSIcannot beobtained, checkfor restrictionin thepump
intake line. If line is not restricted, remove gear pump
(P2) and repair or replace as necessary.
NOTE: If necessary, Steering and Lift Relief Pressure
Test can be conducted with tester as placed for this test.
12.Relieve hydraulic system pressure (See Relieving
Hydraulic System Pressure in the General Information
section). Disconnect tester from gear pump fitting and
hose. Reconnect hose to the pump.
1. Gear pump (P2) 2. To steering control valve
Figure 31
FRONT
RIGHT
2
1
Hydraulic
System