user manual

Rev. A
Groundsmaster 4100--D Hydraulic SystemPage 4 -- 49
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 t o be less efficient. Eventually,
enough o il 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: Onemethodtofindafailingormalfunctioning
deck motor is to have another person observe the ma-
chine while mowing indense turf. A bad deck motor will
run slower, produce fewer clippings and may cause a
different appearance on the turf.
1. Make sure hydraulic oil is at normal operating tem-
peratureby operatingthe machinefor approximately10
minutes. Make sure the hydraulic tank is full.
2. Parkmachineonalevelsurfacewiththecuttingdeck
loweredandoff.Makesureengineisoffandtheparking
brake is engaged.
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.
NOTE: The wing deck motors are connected in series.
To isolate a faulty motor, both motors in the circuit may
havetobetestedbystarting withtheleftside motorfirst.
3. Disconnect return hose from the motor to be tested
(Fig. 37). Install flow tester in series with the motor and
thedisconnectedreturnhose.Makesuretheflowcon-
trol valve on tester is fully open.
4. Disconnect themotor casedrain hose(small diame-
ter hose) where it connects to the machine (not at the
motor).Putasteelcaponthefitting;leavethecasedrain
hose open (Fig. 38).
5. Afterinstallingflowtester,startengineandrunatidle
speed. Check for hydraulic leakage and correct before
proceeding with test.
CAUTION
Cutting deck blades will rotate with PTO switch
inONposition.Keepawayfromcuttingdeckdur-
ing test to prevent personal injury from rotating
blades. Do not stand in front of the machine.
6. Sitonseatandoperatetheengineatfullspeed(2870
RPM). Move PTO switch to ON.
7. While watching pressure gauge, slowly close flow
control valve on tester until a pressure of 1200 PSI (83
bar) is obtained.
NOTE: Use a graduated container, special tool
TOR4077, to measure case drain leakage (Fig. 38).
8. Have another person measure flow from the case
drain linefor 15 seconds,then move thePTO switch to
OFF. Openthe testerflow controlvalve andstop theen-
gine. Record test results.
TEST RESULTS: Flow less than 22.2 ounces (662
ml).
9. If flow ismore than 22.2 ounces (662 ml),themotor
iswornor damagedandshouldberepairedorreplaced.
10.After testing is completed, disconnect tester from
motorandhose.Reconnecthosetothedeckmotor.Re-
movecapfromm achinefittingandreconnectcasedrain
hose.
11.If required, repeat test procedurefor other deck mo-
tors.
1. Deck motor (RH shown)
2. Return hose
3. Case drain hose
Figure 37
1
3
2
Figure 38
Hydraulic
System