Procedure for Cutting Deck Gear Pump Flow Test
IMPORTANT: Do not fully restrict oil flow through
tester. In this test, the flow tester is positioned be-
fore the relief valve. Pump damage can occur if the
oil flow is fully restricted.
NOTE: Overaperiodoftime,thegearsandwearplates
in the gear pump can wear. A worn pump will by--pass
oilandmakethepumplessefficient.Eventually,enough
oillosswilloccurtocausethecuttingdeckmotorstostall
under heavy cutting conditions. Continued operation
with a worn, inefficient pump can generate excessive
heat and cause damage to the seals and other compo-
nents in the hydraulic system.
8. Watch pressure gauge carefully while slowly closing
the flow control valve until 2000 PSI is obtained. Verify
with a phototac that the engine speed is 2400 RPM.
9.
approximately 14 GPM. Shut off engine. Record test re-
For a normal pump, gear pump flow should be
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Make sure hydraulic oil is at normal operating tem-
sults.
10.If
measuredflowislessthan12GPMorifapressure
of 2000 PSI cannot be obtained, check for restriction in
thepumpintakeline.Iflineisnotrestricted,removegear
pump and repair or replace as necessary.
2.
decks lowered and off. Make sure engine is off and the
parking brake is engaged.
Park machine on a level surface with the cutting
11.
Disconnect flowtesterfromhydraulic hoseandman-
ifold port. Reconnect hose to the manifold.
CAUTION
12.Repeat
test for second pump section if required.
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS, and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
TO OIL COOLER
RIGHT
FRONT
4
3.
tested. Disconnect hydraulic hose at deck manifold port
(P1) (Fig. 25).
Locate deck manifold for gear pump section to be
1
2
3
4.
series with the the disconnected hose and hydraulic
manifold port (P1).
Install tester with pressure gauges and flow meter in
5.
Make sure the flow control valve on the tester is
fully open.
Figure 25
6.
speed. Check for hydraulic leakage and correct before
proceeding with test.
After installing tester, start engine and run at idle
1.
2.
Center deck manifold
Hyd. hose to front P1
3.
4.
Wing deck manifold
Hyd. hose to side P1
IMPORTANT: Do not run engine at full speed during
testing. At full engine speed, cutting deck gear
pump output can exceed 15 GPM and cause tester
damage.
7.
Usingaphototac, adjustenginespeedto 2400RPM.
Do not engage the cutting decks.
Groundsmaster 4100--D
Page 4 -- 31
Hydraulic System
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