Procedure for Gear Pump (P2) Flow Test:
Make sure hydraulic oil is at normal operating tem-
2
1.
perature.
RIGHT
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
FRONT
3.
Read Precautions for Hydraulic Testing.
WARNING
1
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.
Figure 31
1.
Gear pump (P2)
2.
To steering control valve
4.
leading to the steering control valve (Fig. 31).
Disconnect hose connection on the gear pump (P2)
5.
with gear pump and the disconnected hose leading to
the steering control valve.
Install hydraulic tester (pressure and flow) in series
6.
Make sure the flow control valve on the tester is fully
open.
7.
50
Start engine and move throttle to full speed (3050 +
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
withaphototac thatthepumpspeedis3100RPMwhile
maintaining 800 PSI.
9.
Flow indication should be 3.6 GPM minimum.
off engine. Record test results.
If flow was less than 3.6 GPM or a pressure of 800
10.Shut
11.
PSIcannotbeobtained,checkforrestrictioninthepump
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.
Groundsmaster 3505--D
Page 4 -- 47
Hydraulic System
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