Procedure for Cutting Deck Gear Pump Flow Test
8. Flowindicationshouldbeapproximately14GPM(53
LPM).
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 deck 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.
9. Shut off engine and record test results.
10.Disconnect
flowtesterfromhydraulic hoseandman-
ifold port. Reconnect hose to the manifold.
11.
If a pressure of 2000 PSI (138 bar) cannot be ob-
tained or flow was less than 11.5 GPM (44 LPM) (85%
of expected flow), check for restriction in the pump in-
takeline.Iflineisnotrestricted, considerthatgearpump
is worn or damaged.
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2.
decks lowered and off. Make sure engine is off and the
parking brake is applied.
Park machine on a level surface with the cutting
RIGHT
FRONT
CAUTION
3
1
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.
4
2
3.
tested. Disconnect hydraulic hose at deck manifold port
(P1) (Fig. 38).
Locate deck manifold for gear pump section to be
Figure 38
1.
2.
Front PTO manifold
Hyd. hose to front P1
3.
4.
LH PTO manifold
Hyd. hose to LH P1
4.
Installtesterinserieswiththethedisconnected hose
and hydraulic manifold port (P1).
5.
Make sure the flow control valve on the tester is fully
open.
6.
RPM). Do not engage the cutting decks.
Start engine and move throttle to full speed (2870
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.
7.
Watch pressure gauge carefully while slowly closing
the flow control valve until 2000 PSI (138 bar) is ob-
tained. Verify with a phototac that the engine speed is
still 2870 RPM.
Groundsmaster 4000--D
Page 4 -- 49
Hydraulic System
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