Groundsmaster 4100--D/4110--D Hydraulic SystemPage 4 -- 55
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 motor can generate excessive heat and cause
damage to hydraulic system components.
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 baddeck motor will
run slower, produce fewer clippings and may cause a
different appearance on the turf.
IMPORTANT: Mowcircuit flowforthe Groundsmas-
ter 4100/4110 is approximately 16 GPM (61 LPM).
Use 40 GPM Hydraulic Tester #AT40002 (pressure
and flow) for this test (see Special Tools in this
chapter).
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. Parkmachineonalevelsurfacewiththecuttingdeck
loweredandoff.Makesureengineisoffandtheparking
brake is engaged.
CAUTION
Prevent personalinjury 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
havetobetestedbystartingwiththeleftsidemotorfirst.
3. Disconnect return hose from the motor to be tested
(Fig. 42).
4. Install 40 GPM Hydraulic Tester #AT40002 (pres-
sure and flow) in series with the motor and the discon-
nectedreturnhose.Usehydraulichose kit (see Special
Toolsinthischapter)toconnecttestertomachine.Make
sure the flow control valve on the tester is fully
open.
5. Disconnect themotor casedrainhose(smalldiame-
ter hose) where it connects to the machine (not at the
motor).Putasteelcaponthefitting;leavethecasedrain
hose open.
6. 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.
7. Sit on seat and move throttle so engine is running at
high idle speed (2870 RPM). Move PTO switch to ON.
8. 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.
9. Have a second person measure flow from the case
drainlinefor 15 seconds, then move the PTOswitchto
OFF.Openthetesterflowcontrol valveandstoptheen-
gine. Record test results.
TEST RESULTS: Flow less than 22.4 ounces (662
ml) of hydraulic fluid in 15 seconds.
10.If flow is more than 22.4 ounces (662 ml) (0.7
GPM/2.6LPM)in15seconds,themotorisw ornordam-
aged and should be repaired or replaced.
11.When testing is complete, disconnect tester and
hose kit from motor and machine hydraulic hose. Re-
connect hose to the deck motor. Remove cap from ma-
chine fitting and reconnect case drain hose.
12.If required, repeat test procedure for other deck mo-
tors.
1. Deck motor (RH shown)
2. Return hose
3. Case drain hose
Figure 42
1
3
2
Hydraulic
System
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