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Groundsmaster 4000--D Hydraulic SystemPage 4 -- 49
Procedure for Cutting Deck Gear Pump Flow Test
NOTE: Overa period of time, the gearsandwearplates
in the pump can wear. A worn pump will by pass oil and
makethepump lessefficient. 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 heat and
cause damage to the seals andothercomponents in the
hydraulic system.
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. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.
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.
3. Locate deck manifold for gear pump section to be
tested. Disconnect hydraulic hose at deck manifold port
(P1) (Fig. 38).
4. Installtesterinserieswith thethedisconnectedhose
and hydraulic manifold port (P1).
5. Make sure the flow control valve on the tester is fully
open.
6. Start engine and move throttle to full speed (2870
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.
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.
8. Flowindication shouldbeapproximately 14 GPM(53
LPM).
9. Shut off engine and record test results.
10.Disconnect flow tester from hydraulic hose and man-
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-
take line. If line is not restricted, consider that gear pump
is worn or damaged.
1. Front PTO manifold
2. Hyd. hose to front P1
3. LH PTO manifold
4. Hyd. hose to LH P1
Figure 38
FRONT
RIGHT
1
3
2
4
Hydraulic
System