Procedure for Gear Pump (P1) Flow Test:
11.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.
NOTE: Overaperiodoftime,thegearsandwearplates
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.
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.
Make sure hydraulic oil is at normal operating tem-
2
perature.
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
RIGHT
1
FRONT
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.
Figure 27
1.
Gear pump (P1)
2.
To hydraulic manifold
4.
leading to port (P1) on the hydraulic manifold (Fig. 27).
Disconnect hose connection on the gear pump (P1)
5.
with the gear pump and the disconnected hose leading
to port (P1) on the hydraulic manifold.
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 tester pressure gauge carefully while slowly
closing the flow control valve until 2000 PSI is obtained.
Donotclosetesterloadvalvefully.Verifywithaphototac
that the pump speed is 3100 RPM while maintaining
2000
PSI.
9.
Flow indication should be 11.8 GPM minimum.
10.Shut
off engine. Record test results.
Groundsmaster 3505--D
Page 4 -- 41
Hydraulic System
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