Procedure for Gear Pump (P2) Flow Test:
Make sure hydraulic oil is at normal operating tem-
2
1.
perature by operating the machine for approximately 10
minutes.
RIGHT
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
FRONT
3.
Read Precautions for Hydraulic Testing.
4.
leading to the steering control valve (Fig. 20).
Disconnect hose connection on the gear pump (P2)
1
5.
nected hose leading to the steering control valve.
Installtesterinserieswithgearpumpandthediscon-
Figure 20
2.
6.
open.
Make sure the flow control valve on the tester is fully
1.
Gear pump (P2)
To steering control valve
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.
10.Shut
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
PSIcannotbeobtained,checkforrestrictioninthepump
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 -- 37
Hydraulic System (Rev. D)
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