Procedure for Cutting Deck Gear Pump Flow Test
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.
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.
NOTE: If engine speed drops below 2870 RPM, pump
flow will decrease.
8.
Flowindicationshouldbeapproximately14GPM(53
LPM).
9.
Shut off engine and record test results.
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
10.If
a pressure of 2000 PSI (138 bar) cannot be ob-
tained or flow was less than 12 GPM (45 LPM), check
for restriction in the pump intake line. If line is not re-
stricted, consider that gear pump section for cutting
deck circuit is worn or damaged.
2.
Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.
11.
After testing is completed, disconnect flow tester
from hydraulic hose and manifold port. Reconnect hose
to the manifold.
CAUTION
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.
RIGHT
FRONT
3.
tested. Disconnect hydraulic hose from fitting in deck
manifold port (P1) (Fig. 46).
Locate deck manifold for gear pump section to be
3
1
4.
disconnected hose and hydraulic fitting in manifold port
(P1).
Install tester (flow and pressure) in series with the
4
2
5.
Make sure the flow control valve on tester is fully
open.
Figure 46
1.
2.
Front PTO manifold
Hyd. hose to front P1
3.
4.
LH PTO manifold
Hyd. hose to LH P1
6.
(2870
Start engine and move throttle to high idle speed
RPM). Do not engage the cutting decks.
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.
Groundsmaster 4000--D/4010--D
Page 4 -- 57
Hydraulic System
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