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Groundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 57
Procedure for Cutting Deck Gear Pump Flow Test
NOTE: Overa period of time, thegears and wear plates
in the pump can wear. A worn pump will by pass oil and
make the pump lessefficient. Eventually, enough oil loss
will occur to cause the cutting deck motors to stall under
heavy cutting conditions. Continued operation with a
worn, inefficient pump can generate excessive heat and
cause damage to the seals and other components in the
hydraulic system.
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.
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 from fitting in deck
manifold port (P1) (Fig. 45).
4. Install tester (flow and pressure) in series with the
disconnected hose and hydraulic fitting in manifold port
(P1).
5. Make sure the flow control valve on tester is fully
open.
6. Start engine and move throttle to high idle 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 f low 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.
NOTE: If engine speed drops below 2870 RPM, pump
flow will decrease.
8. Flow indication should be approximately 14GPM (53
LPM).
9. Shut off engine and record test results.
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.
11.After testing is completed, disconnect flow tester
from hydraulic hose and manifold port. Reconnect hose
to the manifold.
1. Front PTO manifold
2. Hyd. hose to front P1
3. LH PTO manifold
4. Hyd. hose to LH P1
Figure 45
FRONT
RIGHT
1
3
2
4
Hydraulic
System