Procedure for Cutting Deck Motor Case Drain
Leakage Test
5. Sit on seat and start the engine. Move throttle to full
speed (2800 + 50 RPM). Move PTO switch to ON.
NOTE: Over aperiod oftime,adeck motor can wear in-
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,
causedamage toseals andother components inthehy-
draulic system, and affect quality of cut.
6. While watching pressure gauge, slowly close flow
control valve ontester untilapressure of 1200PSIisob-
tained.
NOTE: Use a graduated container, special tool
TOR4077, to measure case drain leakage (Fig. 36).
7.
drain line for 15 seconds, then move the PTO switch to
Have another person measure flow from the case
OFF and stop the engine.
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.
TEST RESULTS: Flow less than 0.7 GPM (less than
22.4
ounces (662 ml) of hydraulic fluid in 15 sec-
onds).
8.
hose to the deck motor. Remove cap from bulkhead fit-
ting and reconnect case drain hose.
Disconnect tester from motor and hose. Reconnect
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Make sure hydraulic oil is at normal operating tem-
9.
damaged and should be repaired or replaced.
If flow is more than 0.7 GPM, the motor is worn or
2.
lowered and off. Make sure engine is off and the parking
brake is engaged.
Parkmachineonalevelsurfacewiththecuttingunits
CAUTION
2
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 deck motors are connected in series. To
isolate a faulty motor, all motors in the circuit may have
to be tested by starting with the first motor in the circuit
(see Hydraulic Schematic).
1
Figure 35
3.
Disconnect pressure return hose from the motor to
be tested (Fig. 35). Install flow tester in series with the
motor and the disconnected return hose. Make sure the
flow control valve on tester is fully open. (Fig. 36).
1.
Pressure return hose
2. Case drain hose
4.
Disconnect the motor case drain hose (small diame-
ter hose) where it connects to bulkhead fitting at the
frame rail (not at the motor). Put a steel cap on the bulk-
head fitting; leave the case drain hose open (Fig. 36).
CAUTION
Cutting unit blades will rotate when lowered with
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.
Figure 36
Groundsmaster 4500--D/4700--D
Page 4 -- 37
Hydraulic System (Rev. A)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
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| Document Type | Service Manual |
| Language | English |
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