Procedure for Gear Pump (P1) Flow Test:
Overaperiodoftime,thegearsandwearplates
2
Note:
in the pump can wear. A worn pump will by pass oil and
makethepumplessefficient.Eventually,enoughoilloss
will occur to cause the cutting unit motors to stall under
heavy cutting conditions. Continued operation with a
worn, inefficientpump can generate excessive heatand
causedamage tothe seals and othercomponents inthe
hydraulic system.
RIGHT
1
FRONT
1.
perature by operating the machine for approximately 10
minutes.
Make sure hydraulic oil is at normal operating tem-
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
Figure 25
1.
Gear pump (P1)
2.
To hydraulic manifold
3.
Read Precautions for Hydraulic Testing.
4.
leading to port (P1) on the hydraulic manifold (Fig. 25).
Disconnect hose connection on the gear pump (P1)
5.
connected hose leading to port (P1) on the hydraulic
manifold.
Installtesterinserieswiththegearpumpandthedis-
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 2000 PSI is obtained. Do not
closetesterloadvalvefully.Verifywithaphototacthat
the pump speed is 3100 RPM while maintaining 2000
PSI.
9.
Flow indication should be 11.8 GPM minimum.
off engine.
Disconnect tester from gear pump fitting and hose.
10.Shut
11.
Reconnect hose to the pump.
12.If
flow was less than 11.8 GPM or a pressure of 2000
PSIcannotbeobtained,checkforrestrictioninthepump
intake line. If line is not restricted, remove gear pump
(P1) and repair or replace as necessary.
Groundsmaster 3500--D
Page 4 -- 43
Hydraulic System (Rev. D)
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