Groundsmaster 4000 --D/4010--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 t o be less efficient. Eventually,
enough oil loss will cause the deck motor t o 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 in dense turf. A bad motor will run
slower,producefewerclippings andmay causeadiffer-
ent appearance on the turf.
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 lev el 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.
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. 43). I nstall tester (flow and pressure) in se-
rieswith the motor anddisconnectedreturn hose.Make
sure the flow control valve on tester is fully open.
4. Disconnect the motor case drainhose (smalldiame-
terhose)whereitconnectstohydraulicmanifoldtee--fit-
ting(notatthemotor).Putasteelcaponthefittingatthe
tee--fitting; leave the case drain hose open.
CAUTION
Cutting deck blades will rotate when lowered
with PTO switch in ON position. Keep away from
cutting decks during test to prevent personal in-
juryfromrotating blades. Donot standinfrontof
the machine.
5. Siton seatandstarttheengine.Movethrottletohigh
idle speed (2870 RPM). Move PTO switch to ON.
6. 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. 44).
7. Havea second person collect the flowfromthecase
drain line for 15 seconds, then move the PTO switch to
OFF and stop the engine (Fig. 44). Record test results.
TEST RESULTS: Flow less than 22.4 ounces (662
ml) (0.7 GPM/2.6 LPM) of hydraulic fluid in 15 sec-
onds.
8. If flow is more than 22.4 ounces (662 ml) (0.7
GPM/2.6LPM)in15seconds,themotoriswornordam-
aged and should be repaired or replaced.
9. After testing is completed, disconnect tester from
motorandhose.Reconnecthoseto thedeckmotor.Re-
move cap from tee--fitting and reconnect case drain
hose.
1. Deck motor (RH shown)
2. Return hose
3. Case drain hose
Figure 43
1
3
2
Figure 44
Hydraulic
System
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