Rev. F
Groundsmaster 4000--D Hydraulic System (Rev. B)Page 4 -- 35
Procedure for Cutting Deck Motor Case Drain
Leakage Test
NOTE: Overaperiodoftime,adeckmotorcanwearin-
ternally. A worn motor may by--pass oil to its case drain
causing the motor to be less efficient. Eventually,
enough oil loss will cause the deck motor to stall under
heavy cutting conditions. Continued operation with a
worn, inefficient motor can generate excessive heat,
causedamagetosealsandothercomponentsinthehy-
draulic system, and affect quality of cut.
NOTE: One method to find a failing or malfunctioning
deck motor is to have another person observe the ma-
chine while mowing in dense turf. A bad motor will run
slower,producefewerclippings,andmaycauseadiffer-
ent appearance on the turf.
1. Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximately10
minutes. Make sure the hydraulic tank is full.
2. Parkmachineonalevelsurfacewiththecuttingunits
loweredandoff.Makesureengineisoffandtheparking
brake is engaged.
CAUTION
Prevent personal injury and/or damage toequip-
ment. Read all WARNINGS, CAUTIONS, and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
NOTE: The side deck motors are connected in series.
To isolate a faulty motor, both motors in the circuit may
havetobetestedbystartingwiththeleftsidemotorfirst.
3. Disconnect hose from return of the motor to be
tested (Fig. 24). Install flow tester in series with the mo-
tor and disconnected return hose. Make sure the flow
control valve on tester is fully open. (Fig. 25).
4. Disconnectthemotor case drainhose (smalldiame-
terhose)whereitconnectstohydraulicmanifoldtee--fit-
ting(notatthemotor).Putasteelcaponthefittingatthe
tee--fitting; leave the case drain hose open (Fig. 25).
CAUTION
Cuttingunitbladeswillrotatewhenloweredwith
PTO switch in ON position. Keep away from cut-
ting units during test to prevent personal injury
from rotating blades. Do not stand in front of the
machine.
5. Sit on seat and start the engine. Move throttle to full
speed (2730 +
30 RPM). Move PTO switch to ON.
6. While watching pressure gauge, slowly close flow
controlvalveontesteruntilapressureof1200PSIisob-
tained.
NOTE: Use a graduated container, special tool
TOR4077, to measure case drain leakage (Fig. 25).
7. Have another person measure flow from the case
drainline for 15 seconds, thenmove thePTOswitchto
OFF and stop the engine.
TESTRESULTS:Flowless than0.7 GPM (less than
22.4 ounces (662 ml) of hydraulic fluid in 15 sec-
onds).
8. Disconnect tester from motor and hose. Reconnect
hose to the deck motor. Remove cap from tee--fitting
and reconnect case drain hose.
9. If flow is more than 0.7 GPM, the motor is worn or
damaged and should be repaired or replaced.
1. Deck motor (RH shown)
2. Return hose
3. Case drain hose
Figure 24
1
3
2
Figure 25
Hydraulic
System
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